CN112504506B - Device and method for in-situ on-line monitoring of biological tank performance of sewage treatment plant - Google Patents
Device and method for in-situ on-line monitoring of biological tank performance of sewage treatment plant Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000011065 in-situ storage Methods 0.000 title claims description 15
- 238000012544 monitoring process Methods 0.000 title description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 196
- 238000001514 detection method Methods 0.000 claims abstract description 91
- 238000006243 chemical reaction Methods 0.000 claims abstract description 77
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 239000010802 sludge Substances 0.000 claims abstract description 12
- 238000012423 maintenance Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000001502 supplementing effect Effects 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 35
- 239000001301 oxygen Substances 0.000 claims description 35
- 229910052760 oxygen Inorganic materials 0.000 claims description 35
- 238000010992 reflux Methods 0.000 claims description 24
- 238000000605 extraction Methods 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 9
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000013523 data management Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 230000036284 oxygen consumption Effects 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 4
- 239000003792 electrolyte Substances 0.000 abstract description 2
- 230000003203 everyday effect Effects 0.000 abstract description 2
- 230000000737 periodic effect Effects 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 10
- 238000005273 aeration Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000036962 time dependent Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Automation & Control Theory (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Activated Sludge Processes (AREA)
Abstract
The device comprises a water inlet system, a reaction system, a temperature detection and maintenance system, a data detection system, a logic control and data processing system and a feed liquid quantitative supplementing system; the performance of the activated sludge is measured rapidly and directly, so that a sewage treatment operator can obtain the running state of the biological tank in a short time. The device does not need to be attended by a special person, the device and the detection sensor are cleaned through the logic controller, the reaction system and the actual temperature are kept the same, the online measurement and automatic judgment of various data are realized, performance early warning and process adjustment advice are provided for an operator, the operation is safe and convenient, and the efficiency is higher. The operation is simple and convenient, the maintenance is easy, and the leakage detection and the periodic replacement of electrolyte are not required every day; the device has simple structure, no parts such as an electrolytic tank, small size and space saving.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a device and a method for in-situ on-line monitoring of the performance of a biological tank of a sewage treatment plant.
Background
In the prior art, the influence of temperature on a measurement result is not considered in most cases when the performance of a biological pool of a sewage treatment plant is monitored, and in fact, the metabolic activity of microorganisms is increased by about 12% every 1 ℃ of the sewage temperature, so that the influence of temperature on the activity of sludge is considered to be necessary. In order to ensure accurate detection results, heating and heat-preserving equipment can be adopted to maintain the temperature of a reaction system consistent with the detection environment, but the complexity and the performance stability risk of the whole equipment are increased.
In addition, in the prior art, a method of directly aerating a gas distributor is often used for improving the dissolved oxygen of the reactor, but the aeration oxygenation efficiency is too low when the aperture of the gas distributor is too large, and the pollution and blockage easily occur when the aperture of the gas distributor is too small, so that the measurement of the subsequent reaction duration is influenced. When the performance of the activated sludge is evaluated by utilizing the variable frequency parameters of the blower, if the aeration pipeline is overlong in the actual working condition, the variable frequency value reference meaning is not good, the measuring area is often special, the relevance of the measuring area and the aeration state is often deviated, and the variable frequency curve of the blower under the condition can not represent the activity state of the sludge in the biological pond.
In the existing detection method, the MLSS at the tail end is not representative, the MLSS at the tank body of the aeration tank is distributed in a gradient way, the whole value cannot be represented by only taking out water, the measured value cannot be easily stabilized, the deviation between the data and the actual value is large in a long time (more than 100 min) for starting the measurement, and even if the measurement accuracy is poor after the stabilization is achieved.
Stirring in the existing reaction system generally uses stirring shafts for mechanical stirring and non-contact electromagnetic stirring, but the requirements of the stirring shafts for sealing property and corrosion resistance of the stirring shafts are high due to the mechanical stirring of the stirring shafts, and the stirring magnetic particles of the electromagnetic stirring are poor in stability, so that the stirring function is easily lost once the stirring magnetic particles are impacted by water flow.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a device and a method for in-situ on-line monitoring of the performance of a biological tank of a sewage treatment plant.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
The invention discloses a device for in-situ on-line monitoring of the performance of a biological pond of a sewage treatment plant, which comprises a water inlet system, a reaction system, a temperature detection and maintenance system, a data detection system, a logic control and data processing system and a feed liquid quantitative supplementing system;
The water inlet system comprises a water inlet pump, a first electric control three-way valve, a second electric control three-way valve, a water inlet pipeline and a water outlet pipeline;
the reaction system comprises a jacket reaction tube, an internal reflux pump, a jet water pump, a jet oxygenator, an automatic sample retaining device and a pressure balancing tube;
The temperature detection and maintenance system comprises an ambient temperature detection electrode and a temperature detection electrode in the reactor;
The data detection system comprises a dissolved oxygen detection electrode and a pH detection electrode;
the logic control and data processing system comprises a logic controller and a display;
The feed liquid quantitative replenishing system comprises a feed liquid storage bottle, a feed liquid extraction pump, a quantitative bottle and a feed liquid feeding pump;
The jacket reaction tube comprises an inner reaction bottle and an outer jacket, and the outer jacket is arranged outside the inner reaction bottle in a surrounding manner; an inner water inlet interface and an inner water outlet interface are arranged on the inner reaction bottle, an outer water inlet interface and an outer water outlet interface are arranged on the outer jacket, the inner water inlet interface and the outer water inlet interface are respectively communicated with a water inlet pipeline, a first electric control three-way valve is arranged between the inner water inlet interface and the water inlet pipeline, the inner water outlet interface and the outer water outlet interface are respectively communicated with a water outlet pipeline, a second electric control three-way valve is arranged between the inner water outlet interface and the water outlet pipeline, and a jet water pump and a jet oxygenator are arranged on a jet pipeline which is connected with the first electric control three-way valve and the second electric control three-way valve; the dissolved oxygen detection electrode, the pH detection electrode and the temperature detection electrode in the reactor respectively detect corresponding parameters in an inner reaction bottle, and an air pressure balance tube is arranged between the inner reaction bottle and the outside; a reflux pipeline is arranged on the inner reaction bottle, and a reflux water pump is arranged in the reflux pipeline; the environment temperature detection electrode, the pH detection electrode and the dissolved oxygen detection electrode in the reactor are respectively connected with a logic controller, the logic controller controls each part to work, and the logic controller is connected with a display; the liquid storage bottle is connected with the quantitative bottle through an extraction pipeline, a liquid extraction pump is arranged on the extraction pipeline, the quantitative bottle is connected with the internal reaction bottle through a feeding pipeline, a liquid feeding pump is arranged on the feeding pipeline, and an overflow pipeline is further arranged between the quantitative bottle and the liquid storage bottle.
The technical scheme can also adopt the following technical measures:
The opening of the feeding pipeline inserted into the quantifying bottle is positioned at the bottom of the quantifying bottle, and the opening of the overflow pipeline in the quantifying bottle is arranged at the top of the quantifying bottle.
The device for in-situ online monitoring of the performance of the biological pond of the sewage treatment plant further comprises a cloud data management and comprehensive analysis system, wherein the cloud data management and comprehensive analysis system comprises a cloud-end upper computer; the cloud end upper computer is in data connection with the logic controller.
The distance between the water inlet of the water inlet pipeline and the water outlet of the water outlet pipeline in the biological pond is at least 1 meter.
The invention discloses a method for in-situ on-line monitoring of the performance of a biological pond of a sewage treatment plant, which comprises the following steps:
A. Starting the device, wherein an ambient temperature detection electrode detects the temperature in a biological pond as T11, a temperature detection electrode in a reactor detects the temperature in an internal reaction bottle as T10, a pH detection electrode detects the pH value of a mixed solution in the reaction bottle as pH9, an oxygen dissolving detection electrode detects the oxygen dissolving value of the mixed solution in the reaction bottle as DO8, and a display screen connected with a logic controller displays time parameter real-time curves of T11, T10, DO8 and pH9 respectively;
B. The water inlet pump is started, liquid in the biological tank flows into the outer jacket of the jacket reaction tube along the water inlet pipeline through the outer water inlet port, flows out through the outer water outlet port and flows back to the biological tank through the water outlet pipeline, and the liquid circulates between the outer jacket and the biological tank so that the temperature in the outer jacket is the same as the temperature in the biological tank;
C. Starting pre-flushing, wherein a first electric control three-way valve is communicated with a water inlet pipeline and an inner water inlet interface, a second electric control three-way valve is communicated with an inner water outlet interface and a water outlet pipeline, and a water inlet pump operates to guide sewage and activated sludge mixed liquor in a biological pond into an inner reaction bottle;
D. After the internal reaction bottle is communicated with the biological pool, the internal reflux pump starts to operate after a set time period t 1;
E. The first electric control three-way valve turns off the connection between the water inlet interfaces in the water inlet pipeline, the second electric control three-way valve turns off the connection between the inner water outlet interface and the water outlet pipeline, the jet pipeline is turned on between the inner water inlet interface and the inner water outlet interface through the first electric control three-way valve and the second electric control three-way valve, the jet water pump is started, and the jet water pump is turned off after the operation is carried out for a set time period t 2;
F. the first electric control three-way valve and the second electric control three-way valve are closed, at the moment, the first electric control three-way valve, a reaction bottle in a jacket reaction tube, the second electric control three-way valve, a jet oxygenator and a jet water pump loop are disconnected, and a logic controller performs feedback control on the operation of the water inlet pump according to T11 collected by an ambient temperature detection electrode and T10 collected by a temperature detection electrode in the reactor, so that the difference value between the T10 and the T11 is maintained within a set value T0;
G. the first electric control three-way valve and the second electric control three-way valve are opened, the first electric control three-way valve, a reaction bottle in a jacket reaction tube, the second electric control three-way valve, a jet oxygenator and a jet water pump loop are connected, and the opening set time is t2;
H. The first electric control three-way valve turns off the connection between the water inlet interfaces in the water inlet pipeline, the second electric control three-way valve turns off the connection between the inner water outlet interface and the water outlet pipeline, the jet pipeline is conducted between the inner water inlet interface and the inner water outlet interface through the first electric control three-way valve and the second electric control three-way valve, whether the pH9 exceeds a set threshold value pH 01-pH 02 at the moment is judged, if the pH exceeds the threshold value, the logic controller 17 sends out pH early warning, the prompt is simultaneously carried out through the display screen and the cloud upper computer, and the automatic sample retention device is started for sample retention;
I. starting a jet water pump, and closing the jet water pump after the operation is carried out for a set time period t 3;
J. The logic controller performs feedback control on the operation of the jet water pump according to the dissolved oxygen value DO8 acquired by the dissolved oxygen detection electrode, and the jet water pump is closed after DO8 reaches a set value DO 1;
K. the feed liquid extraction pump operates for a set time period t4;
L, the operation of a feed liquid feeding pump is set for a period of time t5;
M, the logic controller judges whether the dissolved oxygen value D08 acquired by the dissolved oxygen detection electrode reaches a set value DO2 or not, and records a time t01 and a corresponding DO3 at the time after the set value DO2 is reached; judging whether the dissolved oxygen value D08 reaches a set value DO4 every 5-10 s, recording the time t02 and the corresponding DO5 at the time after the dissolved oxygen value D08 reaches the set value DO4, recording data and drawing a real-time image; storing DO3, DO5, t02, t01;
N, calculating area integral A of t02 and t01 in the DO-t function image, judging whether the range A exceeds a set value A0, wherein A0 is a function of time and temperature, if the range A exceeds the set value, a logic controller gives an early warning, prompts through a display and a cloud upper computer, and simultaneously starts a sample reserving relay to reserve samples;
The calculation method of O, A0 is as follows: f (T, T) is a fitting function of annual OUR values and time and temperature of the sewage treatment plant in the region to be measured, namely A0=F (T, T) x T, OUR in different times of the whole year is measured, corresponding temperature and month are measured, and the method is obtained through least square fitting by a mathematical tool; or when the measurement region lacks corresponding historical data, A0 is obtained by referring to the following empirical formula:
F(T,t)＝60×OUR×θ(T-20)
When T is equal to or greater than 20 ℃, θ=1.05; θ=1.07 when T < 20 ℃; where OUR is the temporary measured activated sludge oxygen consumption rate;
P, after a time delay is set for a time period t6, opening a first electric control three-way valve and a second electric control three-way valve, wherein a reaction bottle in a jacket reaction tube, the second electric control three-way valve, a jet oxygenator and a jet water pump loop are communicated, starting a water inlet pump, starting a reflux water pump after the water inlet pump runs for a set time period t2, closing the reflux water pump after the reflux water pump runs for a set time period t3, and closing the water inlet pump after the set time period t 6;
And Q, finishing the detection, recording the detection times as N, judging whether N is equal to a set value N0, stopping the detection if N is N0, resetting N to 0, and returning to the step B for carrying out the next detection if N does not reach N0, wherein the next detection corresponds to N=N+1.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
According to the device and the method for in-situ on-line monitoring of the performance of the biological tank of the sewage treatment plant, disclosed by the invention, the performance of the activated sludge is rapidly and directly measured, so that a sewage treatment operator can obtain the running state of the biological tank in a short time. In addition, the device does not need to be attended by a special person, the device and the detection sensor are cleaned through the logic controller, the reaction system is kept the same as the actual temperature, the online measurement and automatic judgment of various data are realized, performance early warning and process adjustment suggestions are provided for operators, the operation is safe and convenient, and the efficiency is high. The operation is simple and convenient, the maintenance is easy, and the leakage detection and the periodic replacement of electrolyte are not required every day; the device has simple structure, no parts such as an electrolytic tank, small size and space saving.
Drawings
FIG. 1 is a schematic diagram of an in-situ on-line monitoring device for the performance of a biological tank of a sewage treatment plant;
FIG. 2 is a flow chart of a method of in situ on-line monitoring of biological tank performance of a wastewater treatment plant in accordance with the present invention;
FIG. 3 is a graph showing the background value parameter of sewage over time;
FIG. 4 is a schematic diagram of the time profile of the activated sludge parameters;
FIG. 5 is a schematic diagram of the time-dependent parameter curves during feed liquid addition;
FIG. 6 is a graph showing the parameter change with time after adding heavy metal ions;
FIG. 7 is a schematic graph of a repeated multiple test.
Detailed Description
The invention will be explained in detail by the following examples, the purpose of which is to protect all technical improvements within the scope of the invention.
As shown in fig. 1 and 2, the device for in-situ on-line monitoring of the performance of the biological pond of the sewage treatment plant comprises a water inlet system, a reaction system, a temperature detection and maintenance system, a data detection system, a logic control and data processing system and a feed liquid quantitative supplementing system;
the water inlet system comprises a water inlet pump 1, a first electric control three-way valve 3, a second electric control three-way valve 4, a water inlet pipeline and a water outlet pipeline;
The reaction system comprises a jacket reaction tube 2, an internal reflux pump 5, a jet water pump 6, a jet oxygenator 7, an automatic sample retention device and a barometric pressure balance tube 16;
The temperature detection and maintenance system comprises an ambient temperature detection electrode 11 and a temperature detection electrode 10 in the reactor;
the data detection system comprises a dissolved oxygen detection electrode 8 and a pH detection electrode 9;
the logic control and data processing system comprises a logic controller 17 and a display 18;
The feed liquid quantitative replenishing system comprises a feed liquid storage bottle 15, a feed liquid extraction pump 12, a quantitative bottle 14 and a feed liquid feeding pump 13;
The water inlet pipeline is connected with the water inlet pump, the jacket reaction pipe comprises an inner reaction bottle and an outer jacket, and the outer jacket surrounds the outer part of the inner reaction bottle; an inner water inlet interface and an inner water outlet interface are arranged on the inner reaction bottle, an outer water inlet interface and an outer water outlet interface are arranged on the outer jacket, the inner water inlet interface and the outer water inlet interface are respectively communicated with a water inlet pipeline, a first electric control three-way valve is arranged between the inner water inlet interface and the water inlet pipeline, the inner water outlet interface and the outer water outlet interface are respectively communicated with a water outlet pipeline, a second electric control three-way valve is arranged between the inner water outlet interface and the water outlet pipeline, and a jet water pump and a jet oxygenator are arranged on a jet pipeline connected with the first electric control three-way valve and the second electric control three-way valve; the dissolved oxygen detection electrode, the pH detection electrode and the temperature detection electrode in the reactor respectively detect corresponding parameters in an inner reaction bottle, and an air pressure balance tube is arranged between the inner reaction bottle and the outside; a reflux pipeline is arranged on the inner reaction bottle, and a reflux water pump is arranged in the reflux pipeline; the environment temperature detection electrode, the pH detection electrode and the dissolved oxygen detection electrode in the reactor are respectively connected with a logic controller, the logic controller controls each part to work, and the logic controller is connected with a display; the liquid storage bottle is connected with the quantitative bottle through an extraction pipeline, a liquid extraction pump is arranged on the extraction pipeline, the quantitative bottle is connected with the internal reaction bottle through a feeding pipeline, a liquid feeding pump is arranged on the feeding pipeline, and an overflow pipeline is further arranged between the quantitative bottle and the liquid storage bottle.
The opening of the feeding pipeline corresponding to the quantitative bottle is positioned at the bottom of the quantitative bottle, and the opening of the return pipeline corresponding to the quantitative bottle is arranged at the top of the quantitative bottle. The liquid in the quantitative bottle can be continuously supplied to the liquid extraction pump to be full of the liquid and overflowed from the overflow pipeline when the liquid extraction pump runs each time, the liquid in the quantitative bottle is conveyed to the internal reaction bottle by the feeding pump when the liquid extraction pump runs each time, and the liquid does not flow out of the quantitative bottle any more, so that the liquid quantity fed into the internal reaction bottle each time can be accurately controlled.
The device for in-situ online monitoring of the performance of the biological pool of the sewage treatment plant further comprises a cloud data management and comprehensive analysis system, wherein the cloud data management and comprehensive analysis system comprises a cloud-end upper computer; the cloud end upper computer is in data connection with the logic controller, and the cloud end upper computer can receive, store and analyze the detected numerical values, perform system management on the detected data and send out early warning prompts.
The distance between the water inlet of the water inlet pipeline and the water outlet of the water outlet pipeline in the biological pond is at least 1 meter, so that the influence of the discharged liquid in the previous batch detection on the water inlet sampling is reduced.
As shown in fig. 3, the method for in-situ on-line monitoring of the performance of the biological pond of the sewage treatment plant comprises the following steps:
A. Starting the device, wherein an ambient temperature detection electrode detects the temperature in a biological pond as T11, a temperature detection electrode in a reactor detects the temperature in an internal reaction bottle as T10, a pH detection electrode detects the pH value of a mixed solution in the reaction bottle as pH9, a dissolved oxygen detection electrode detects the dissolved oxygen value of the mixed solution in the reaction bottle as DO8, and a display screen connected with a logic controller displays time parameter real-time curves of T11, T10, DO8 and pH9 respectively;
B. The water inlet pump is started, liquid in the biological tank flows into the outer jacket of the jacket reaction tube along the water inlet pipeline through the outer water inlet port, flows out through the outer water outlet port and flows back to the biological tank through the water outlet pipeline, and the liquid circulates between the outer jacket and the biological tank so that the temperature in the outer jacket is the same as the temperature in the biological tank;
C. Starting pre-flushing, wherein a first electric control three-way valve 3 is communicated with a water inlet pipeline and an inner water inlet port, a second electric control three-way valve 4 is communicated with an inner water outlet port and a water outlet pipeline, and a water inlet pump operates to guide sewage and activated sludge mixed liquor in a biological pond into an inner reaction bottle;
D. After the internal reaction bottle is communicated with the biological pool, the internal reflux pump 5 starts to run after a set time period t 1;
E. the first electric control three-way valve turns off the connection between the water inlet interfaces in the water inlet pipeline, the second electric control three-way valve turns off the connection between the inner water outlet interface and the water outlet pipeline, the jet pipeline is turned on between the inner water inlet interface and the inner water outlet interface through the first electric control three-way valve and the second electric control three-way valve, the jet water pump is started, and the jet water pump is turned off after the operation is set for a length t 2;
F. The first electric control three-way valve 3 and the second electric control three-way valve 4 are closed, at the moment, the loops of the first electric control three-way valve 3, the reaction bottle in the jacket reaction tube (2), the second electric control three-way valve 4, the jet oxygenator 7 and the jet water pump 6 are disconnected, and the logic controller performs feedback control on the operation of the water inlet pump according to T11 collected by the ambient temperature detection electrode and T10 collected by the temperature detection electrode in the reactor, and the difference value between the T10 and the T11 is maintained within a set value T0;
G. the first electric control three-way valve 3 and the second electric control three-way valve 4 are opened, the loops of the first electric control three-way valve 3, the reaction bottle in the jacket reaction tube 2, the second electric control three-way valve 4, the jet oxygenator 7 and the jet water pump 6 are connected, and the opening set time length is t2;
H. The first electric control three-way valve turns off the connection between the water inlet interfaces in the water inlet pipeline, the second electric control three-way valve turns off the connection between the inner water outlet interface and the water outlet pipeline, the jet pipeline is conducted between the inner water inlet interface and the inner water outlet interface through the first electric control three-way valve and the second electric control three-way valve, whether the pH9 exceeds a set threshold value pH 01-pH 02 at the moment is judged, if the pH exceeds the threshold value, the logic controller 17 sends out pH early warning, the prompt is simultaneously carried out through the display screen and the cloud upper computer, and the automatic sample retention device is started to carry out sample retention;
I. starting a jet water pump, and closing the jet water pump after the operation is carried out for a set time period t 3;
J. The logic controller performs feedback control on the operation of the jet water pump according to the dissolved oxygen value DO8 acquired by the dissolved oxygen detection electrode, and the jet water pump is closed after DO8 reaches a set value DO 1;
K. the feed liquid extraction pump operates for a set time period t4;
L, the operation of a feed liquid feeding pump is set for a period of time t5;
M, the logic controller judges whether the dissolved oxygen value D08 acquired by the dissolved oxygen detection electrode reaches a set value DO2 or not, and records a time t01 and a corresponding DO3 at the time after the set value DO2 is reached; judging whether the dissolved oxygen value D08 reaches a set value DO4 every 5-10 s, recording the time t02 and the corresponding DO5 at the time after the dissolved oxygen value D08 reaches the set value DO4, recording data and drawing a real-time image; storing DO3, DO5, t02, t01;
N, calculating area integral A of t02 and t01 in the DO-t function image, judging whether the range A exceeds a set value A0, wherein A0 is a function of time and temperature, if the range A exceeds the set value, a logic controller gives an early warning, prompts through a display and a cloud upper computer, and simultaneously starts a sample reserving relay to reserve samples;
The calculation method of O, A0 is as follows: f (T, T) is a fitting function of annual OUR values and time and temperature of the sewage treatment plant in the region to be measured, namely A0=F (T, T) x T, OUR in different times of the whole year is measured, corresponding temperature and month are measured, and the method is obtained through least square fitting by a mathematical tool; or when the corresponding historical data of the lack of the measurement area is measured, obtaining A0 by referring to the following empirical formula:
F(T,t)＝60×OUR×θ(T-20)
When T is equal to or greater than 20 ℃, θ=1.05; θ=1.07 when T < 20 ℃; where OUR is the temporary measured activated sludge oxygen consumption rate;
p, after a time delay is set for a time period t6, opening a first electric control three-way valve 3 and a second electric control three-way valve 4, connecting a loop of the first electric control three-way valve 3, a reaction bottle in a jacket reaction tube 2, the second electric control three-way valve 4, a jet oxygenator 7 and a jet water pump 6, starting a water inlet pump, starting a reflux water pump after the water inlet pump runs for a set time period t2, closing the reflux water pump after the reflux water pump runs for a set time period t3, and closing the water inlet pump after the set time period t 6;
And Q, finishing the detection, recording the detection times as N, judging whether N is equal to a set value N0, stopping the detection if N is N0, resetting N to 0, and returning to the step B for carrying out the next detection if N does not reach N0, wherein the next detection corresponds to N=N+1.
In the steps, t1, t2, t3, t4, t5 and t6 are set values, t1, t2, t3, t4 and t5 are respectively 5-10 s, and t6 is 30-60 s.
Fig. 4 to 7 are graphs showing time-dependent changes of various parameters, particularly dissolved oxygen and pH, in the execution of the method for in-situ on-line monitoring of the performance of a biological tank of a sewage treatment plant according to the present invention. FIG. 7 reflects the consistency of the data from each test, verifying the feasibility and accuracy of the method.
The invention has not been described in detail in the prior art, and it is apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (1)
1. The in-situ on-line monitoring device for the performance of the biological pond of the sewage treatment plant comprises a water inlet system, a reaction system, a temperature detection and maintenance system, a data detection system, a logic control and data processing system and a feed liquid quantitative supplementing system;
The water inlet system comprises a water inlet pump (1), a first electric control three-way valve (3), a second electric control three-way valve (4), a water inlet pipeline and a water outlet pipeline;
the reaction system comprises a jacket reaction tube (2), an internal reflux pump (5), a jet water pump (6), a jet oxygenator (7), an automatic sample retaining device and a pressure balancing tube (16);
The temperature detection and maintenance system comprises an ambient temperature detection electrode (11) and a temperature detection electrode (10) in the reactor;
The data detection system comprises a dissolved oxygen detection electrode (8) and a pH detection electrode (9);
the logic control and data processing system comprises a logic controller (17) and a display (18);
The feed liquid quantitative replenishing system comprises a feed liquid storage bottle (15), a feed liquid extraction pump (12), a quantitative bottle (14) and a feed liquid feeding pump (13);
The water inlet pipeline is connected with the water inlet pump, the jacket reaction pipe comprises an inner reaction bottle and an outer jacket, and the outer jacket surrounds the outer part of the inner reaction bottle; an inner water inlet interface and an inner water outlet interface are arranged on the inner reaction bottle, an outer water inlet interface and an outer water outlet interface are arranged on the outer jacket, the inner water inlet interface and the outer water inlet interface are respectively communicated with a water inlet pipeline, a first electric control three-way valve is arranged between the inner water inlet interface and the water inlet pipeline, the inner water outlet interface and the outer water outlet interface are respectively communicated with a water outlet pipeline, a second electric control three-way valve is arranged between the inner water outlet interface and the water outlet pipeline, and a jet water pump and a jet oxygenator are arranged on a jet pipeline connected with the first electric control three-way valve and the second electric control three-way valve; the dissolved oxygen detection electrode, the pH detection electrode and the temperature detection electrode in the reactor respectively detect corresponding parameters in an inner reaction bottle, and an air pressure balance tube is arranged between the inner reaction bottle and the outside; a reflux pipeline is arranged on the inner reaction bottle, and a reflux water pump is arranged in the reflux pipeline; the environment temperature detection electrode, the pH detection electrode and the dissolved oxygen detection electrode in the reactor are respectively connected with a logic controller, the logic controller controls each part to work, and the logic controller is connected with a display; the material liquid storage bottle is connected with the quantitative bottle through an extraction pipeline, a material liquid extraction pump is arranged on the extraction pipeline, the quantitative bottle is connected with the internal reaction bottle through a feeding pipeline, a material liquid feeding pump is arranged on the feeding pipeline, and an overflow pipeline is also arranged between the quantitative bottle and the material liquid storage bottle;
the cloud data management and comprehensive analysis system comprises a cloud end upper computer (19); the cloud end upper computer is in data connection with the logic controller;
The method comprises the following steps:
A. Starting the device, wherein an ambient temperature detection electrode detects the temperature in a biological pond as T11, a temperature detection electrode in a reactor detects the temperature in an internal reaction bottle as T10, a pH detection electrode detects the pH value of a mixed solution in the reaction bottle as pH9, a dissolved oxygen detection electrode detects the dissolved oxygen value of the mixed solution in the reaction bottle as DO8, and a display screen connected with a logic controller displays time parameter real-time curves of T11, T10, DO8 and pH9 respectively;
B. the water inlet pump is started, liquid in the biological tank flows into the outer jacket of the jacket reaction tube along the water inlet pipeline through the outer water inlet port, flows out through the outer water outlet port and flows back to the biological tank through the water outlet pipeline, and the liquid circulates between the outer jacket and the biological tank so that the temperature in the outer jacket is the same as the temperature in the biological tank;
C. Starting pre-flushing, wherein a first electric control three-way valve (3) is communicated with a water inlet pipeline and an inner water inlet interface, a second electric control three-way valve (4) is communicated with an inner water outlet interface and a water outlet pipeline, and a water inlet pump operates to guide sewage and activated sludge mixed liquor in a biological pond into an inner reaction bottle;
D. After the internal reaction bottle is communicated with the biological pool, the internal reflux pump (5) starts to operate after a set time period t 1;
E. The first electric control three-way valve turns off the connection between the water inlet interfaces in the water inlet pipeline, the second electric control three-way valve turns off the connection between the inner water outlet interface and the water outlet pipeline, the jet pipeline is turned on between the inner water inlet interface and the inner water outlet interface through the first electric control three-way valve and the second electric control three-way valve, the jet water pump is started, and the jet water pump is turned off after the operation is carried out for a set time period t 2;
F. The first electric control three-way valve (3) and the second electric control three-way valve (4) are closed, at the moment, the loops of the first electric control three-way valve (3), the reaction bottle in the jacket reaction tube (2), the second electric control three-way valve (4), the jet oxygenator (7) and the jet water pump (6) are disconnected, and the logic controller performs feedback control on the operation of the water inlet pump according to T11 collected by the ambient temperature detection electrode and T10 collected by the temperature detection electrode in the reactor, and the difference value between the T10 and the T11 is maintained within a set value T0;
G. The first electric control three-way valve (3) and the second electric control three-way valve (4) are opened, the loops of the first electric control three-way valve (3), the reaction bottle in the jacket reaction tube (2), the second electric control three-way valve (4), the jet oxygenator (7) and the jet water pump (6) are connected, and the opening set time length is t2;
H. The first electric control three-way valve turns off the connection between the water inlet interfaces in the water inlet pipeline, the second electric control three-way valve turns off the connection between the inner water outlet interface and the water outlet pipeline, the jet pipeline is conducted between the inner water inlet interface and the inner water outlet interface through the first electric control three-way valve and the second electric control three-way valve, whether the pH9 exceeds a set threshold value pH 01-pH 02 at the moment is judged, if the pH exceeds the threshold value, the logic controller sends out pH early warning, the prompt is carried out simultaneously through the display screen and the cloud upper computer, and the automatic sample retention device is started for sample retention;
I. starting a jet water pump, and closing the jet water pump after the operation is carried out for a set time period t 3;
J. the logic controller performs feedback control on the operation of the jet water pump according to the dissolved oxygen value DO8 acquired by the dissolved oxygen detection electrode, and the jet water pump is closed after DO8 reaches a set value DO 1;
K. the feed liquid extraction pump operates for a set time period t4;
L, the operation of a feed liquid feeding pump is set for a period of time t5;
M, the logic controller judges whether the dissolved oxygen value D08 acquired by the dissolved oxygen detection electrode reaches a set value DO2 or not, and records a time t01 and a corresponding DO3 at the time after the set value DO2 is reached; judging whether the dissolved oxygen value D08 reaches the set value DO4 every 5-10 s, recording the time t02 and the corresponding DO5 at the time after the dissolved oxygen value D08 reaches the set value DO4, recording data and drawing a real-time image; storing DO3, DO5, t02, t01;
N, calculating area integral A of t02 and t01 in the DO-t function image, judging whether the range A exceeds a set value A0, wherein A0 is a function of time and temperature, if the range A exceeds the set value, a logic controller gives an early warning, prompts through a display and a cloud upper computer, and simultaneously starts a sample reserving relay to reserve samples;
The calculation method of O, A0 is as follows: f (T, T) is a fitting function of annual OUR values and time and temperature of the sewage treatment plant in the region to be measured, namely A0=F (T, T) x T, OUR in different times of the whole year is measured, corresponding temperature and month are measured, and the method is obtained through least square fitting by a mathematical tool; or when the measurement region lacks corresponding historical data, A0 is obtained by referring to the following empirical formula:
F(T,t)＝60×OUR×θ(T-20)
When T is equal to or greater than 20 ℃, θ=1.05; θ=1.07 when T < 20 ℃; where OUR is the temporary measured activated sludge oxygen consumption rate;
p, after a time delay is set for a time period t6, opening a first electric control three-way valve (3) and a second electric control three-way valve (4), connecting a loop of the first electric control three-way valve (3), a reaction bottle in a jacket reaction tube (2), the second electric control three-way valve (4), a jet oxygenator (7) and a jet water pump (6), starting a water inlet pump, starting a reflux water pump after the water inlet pump runs for a set time period t2, closing the reflux water pump after the reflux water pump runs for a set time period t3, and closing the water inlet pump after the set time period t 6;
And Q, finishing the detection, recording the detection times as N, judging whether N is equal to a set value N0, stopping the detection if N is N0, resetting N to 0, and returning to the step B for carrying out the next detection if N does not reach N0, wherein the next detection corresponds to N=N+1.
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