KR100322858B1 - Sewage Treatment Equipment - Google Patents

Abstract

An object of the present invention is to provide a sewage treatment apparatus having high phosphorus removal performance and sewage treatment ability.

And a second anaerobic tank (10), a biofilm filtration tank (17), a sewage treatment tank (29), and an elution tank (16). The sewage in the second anaerobic tank (10) is passed through a elution tank (16) to a biofilm filtration tank (17). Install a conveying means for conveying.

Description

Sewage Treatment Equipment

The present invention relates to a sewage treatment apparatus for purifying sewage, and more particularly, to a sewage treatment apparatus for removing phosphorus from sewage.

In recent years, biofilm filtration has attracted attention as a method for efficiently removing nitrogen from a small area.

The biofilm filtration method is a method of attaching microorganisms to the surface of a biofilm filter material and treating the wastewater by passing the sewage through the biofilm filter tank in which the biofilm filter material is disposed. It has the advantage of high throughput and the ability to install this device on a small plot.

However, in the biofilm filtration method, there is a problem that phosphorus cannot be sufficiently removed.

Therefore, it may be considered to add a coagulant such as ferric chloride to react with phosphoric acid to coagulate and precipitate it.

However, when the ferric chloride is dissolved, iron ions and chlorine ions are added, so that unnecessary impurities of chlorine ions are added to the sewage, which may adversely affect microorganisms in the biofilm filtration tank. In addition, with the treatment of sewage in the biofilm filtration tank, the wastewater gradually became acidic, and the activity of the microorganisms in the biofilm filtration tank was lowered, resulting in a decrease in treatment capacity.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a sewage treatment apparatus by a biofilm filtration method having a high phosphorus removal ability and a sewage treatment ability.

1 is a cross-sectional view of a sewage treatment apparatus of one embodiment of the present invention.

Figure 2 is an enlarged cross-sectional view of the elution tank of the above sewage treatment apparatus.

3 is a perspective view of the fractional measuring device of the above sewage treatment apparatus.

(Explanation of symbols for main parts of drawing)

10 Second anaerobic tank (anaerobic department)

16 elution tank

17 biofilm filtration tank

18 outlet

21 electrodes

29 Treatment Tank

50 2nd opening for inspection (opening for inspection)

52 2nd cover body (cover body)

56 Control Circuit (Control Means)

A first means for solving the above problems is to store an anaerobic tank for anaerobic sewage, a biofilm filtration tank for aerobic treatment of anaerobic sewage from the anaerobic tank, and a sewage treated in the biofilm filtration tank. A transport tank having a treatment tank to make iron and aluminum, and an elution tank for supplying a current to the electrode to elute iron ions or aluminum, and transferring the sewage in the anaerobic tank to the biofilm filtration tank through the elution tank. Characterized in that installed.

The second means for solving the above problems is to store an anaerobic tank for anaerobic sewage, a biofilm filtration tank having an anaerobic sewage treatment in the anaerobic tank, and a sewage treated in the biofilm filtration tank. And an elution tank for eluting iron ions or aluminum by supplying a current to the electrode, and disposing the elution tank at a position above the biofilm filtration tank. A discharge port is formed on the bottom of the elution tank, and a transfer means for supplying sewage in the anaerobic tank is provided in the elution tank, and iron or aluminum ions are eluted from the sewage in the anaerobic tank supplied to the elution tank by the transfer means. It is characterized by returning to the biofilm filtration tank through the outlet.

In the first or second means described above, the inspection opening in the biofilm filtration tank provided in the biofilm filtration tank is provided, and the lid body for freely opening and closing the inspection opening is freely provided. It is preferable to arrange in the vicinity.

In the above second means, it is preferable to provide control means for stopping the supply of current supplied to the electrode when the transfer means is stopped.

(Example)

An embodiment of the present invention will be described below in detail based on the sewage treatment apparatus shown in Figs.

1 is a tank embedded in the ground, the inside of which is the first anaerobic tank 5, the first partition wall 2, the second partition wall 3, and the third partition wall 4, which will be described later. It is divided into two anaerobic tanks 10, a biofilm filtration tank 17, a treatment water tank 29, and a disinfection tank 31.

5 is a first anaerobic tank having an inlet 6 through which sewage such as household wastewater flows, and 7 is a first anaerobic filtration phase disposed in the first anaerobic tank 5, which flows into the first anaerobic tank 5. The organic matter is anaerobicly decomposed by the anaerobic microorganisms attached to the first anaerobic filtration phase by sedimenting and separating the hardly degradable contaminants mixed in the sewage, and the organic nitrogen is anaerobicly decomposed into ammonia nitrogen.

8 is an advection pipe which connects the bottom of the first anaerobic tank 5 and the bottom of the second anaerobic tank 10 to be described later through a through hole 9 penetrating the upper portion of the first partition wall 2.

10 is a second anaerobic tank partitioned from the first anaerobic tank 5 by the first partition wall 2, and 11 is a second anaerobic filtration image installed in the second anaerobic tank 10, the second anaerobic filtration phase. The suspended solids are captured by (11), and anaerobic decomposition of organic matter is carried out by anaerobic microorganisms, and organic nitrogen is anaerobicly decomposed with ammonia nitrogen.

12 is a quantitative pressure chamber arranged in the sewage above the second anaerobic filtration phase 11, 13 is connected to the quantitative pressure chamber 12 in a quantitative pressure chamber for filthy water in the second anaerobic tank 10 A water intake pipe having a backflow stop valve (not shown), which is drawn in (12), and 14 is a first blower for supplying air to the metered volume chamber 12, and 15 is the metered chamber 12; It is a supply pipe which supplies the sewage in the 2nd anaerobic tank 10 to the elution tank 16 in communication with the elution tank 16 demonstrated next.

By supplying air from the first blower 14 to the metered volume chamber 12, a predetermined amount of sewage flowed into the metered volume chamber 12 from the water intake pipe 13 is pumped and the elution tank ( 16).

16 is an elution tank disposed above the second anaerobic tank 10 and the biofilm filtration tank 17 partitioned by the second partition wall 3, and faces the second opening for opening 50 to be described later. It is arrange | positioned at the position to do

18 is a discharge port provided at the bottom of the elution tank 16, and transfers the sewage supplied from the supply pipe 15 to the elution tank 16 from the discharge port 18 to the biofilm filtration tank 17.

19 is an exhaust port provided in the upper part of the elution tank 16 and which discharges the air in the elution tank 16. In FIG.

20 is an electrode cover which has the electrode 21 made of iron arrange | positioned in the said dissolution tank 16, and was made of the insulator which closes the dissolution tank 16. As shown in FIG.

22 is a power supply device which is controlled by the control circuit 56 to be described later and supplies a DC constant current between the electrodes 21, and the DC constant current supplied from the power supply device 22 between the electrodes 21 is supplied. By supplying, iron ions are eluted to the sewage in the elution tank 16.

23 is a first acid engine disposed between the electrodes 21 at the bottom of the elution tank 16 and forms a plurality of air outlets, and is connected to the second blower 24 and the second blower 24. Air is discharged from the air outlet to clean the electrode 21 and prevent sludge attachment, while reacting the divalent (2 오르) iron ions eluted from the electrode 21 with orthophosphoric acid. Is oxidized to trivalent iron ions.

25 is a biofilm filter material disposed in the biofilm filter tank 17, and promotes culture of aerobic microorganisms.

26 is a second acid engine disposed at the bottom of the biofilm filtration tank 17, which forms a plurality of air discharge ports and is connected to the second blower 24 to supply air supplied from the second blower 24. It keeps the inside of the biofilm filtration tank 17 in aerobic state by discharging it from the air outlet, and decomposes sewage by aerobic microorganisms and decomposes ammonia nitrogen into acetic acid or nitric acid nitrogen by the action of acetic acid bacteria or acetic acid bacteria. do.

27 is a communication tube which connects the bottom of the biofilm filtration tank 17 and the process water tank 29 which are demonstrated below through the communication port 28 which penetrates the said 3rd partition wall 4 upper part.

29 is a treatment tank partitioned from the biofilm filtration tank 17 by the third partition wall 4, and has a pump 30 connected to the communication tube 27 at the bottom thereof. The sewage treated in the biofilm filtration tank 17 supplied from the communication pipe 27 is stored.

31 is a disinfection tank provided in the upper part of the said processing water tank 29, and the wastewater in the processing water tank 29 flows in.

32 is a sterilization apparatus provided in the disinfection tank 31, and disinfects the sewage flowing into the disinfection tank 31 with a chemical such as a chlorine system stored in the sterilization apparatus 32.

33 is a drain port connected to the disinfection tank 31 so that the treated water sterilized in the disinfection tank 31 is drained out of the tank 1.

34 is a 1st conveying pipe which connects the upper part of the said processing water tank 29, and the inflow chamber 38 of the fractional metering apparatus 37 demonstrated later.

35 is a third acid engine disposed in the first conveying pipe 34, and forms a plurality of air discharge ports and is connected to the third blower 36. As shown in FIG.

By discharging air supplied from the third blower 36 from the air outlet of the third acid pipe 35, the sewage in the treatment tank 29 is discharged through the first conveying pipe 34 to be described later. It is made to transfer to the inflow chamber 38 of (37).

37 is a rectangular box-shaped fractional weighing device disposed above the treatment tank 29, and the sewage conveyed by the first conveying pipe 34 in order to perform stable denitrification in the first anaerobic tank 5. The amount conveyed to the first anaerobic tank 5 can be adjusted to a predetermined amount.

The fountain measuring device 37 is formed by an inlet chamber 38 connected to the first conveying pipe 34 and an isolation wall 39 which forms an opening for communicating the inlet chamber 38 with the lower side. It is partitioned into the partitioned intermediate chamber 40, and the 1st fountain chamber 41 and the 2nd fountain chamber 42 which the wastewater in the intermediate chamber 40 flows into.

The first fountain chamber 41 is connected to the first anaerobic tank 5 through the second conveying pipe 43, and at the same time, an incision in which the upper part of the wall is opened in a V shape with the intermediate chamber 40 ( 44) are connected in series.

The second fountain chamber 42 is connected to the upper portion of the treatment tank 29 by a conveying port 45, and at the same time, an overflow overflow plate 46 capable of adjusting the height with the intermediate chamber 40. It is connected by the opening which is formed in the upper part.

By adjusting the height of the overflow overflow plate 46 to change the size of the opening formed in the upper portion of the overflow overflow plate 46, the amount of filthy water conveyed from the second fountain chamber 42 to the treatment tank 29 By setting, the amount of sewage flowing into the first anaerobic tank 5 from the first fountain chamber 41 can be adjusted.

47 is a sludge conveying pipe which connects the upper part of the said 1st anaerobic tank 5 and the upper part of the biofilm filtration tank 17, and conveys sludge etc. which were deposited in the biofilm filter material 25 to the 1st anaerobic tank 5. As shown in FIG.

48 is a first inspection opening provided at a position facing the first anaerobic tank 5 and the second anaerobic tank 10 on the first partition wall 2, 49 is the first inspection opening 48. As the first lid body to open and close the door freely, the sludge deposited on the bottom of the first anaerobic tank 5 and the second anaerobic tank 10 is opened and closed at the time of suction removal.

50 is a 2nd inspection opening provided in the position which opposes the said biofilm filtration tank 17 and the elution tank 16, 51 is a reed switch provided in the 2nd inspection opening 50, The said 2nd inspection The opening / closing state is detected by the magnet 53 provided in the 2nd lid body 52 which opens and closes the opening / closing opening 50 freely.

The second lid is positioned by positioning means (not shown) such that the magnet 53 provided on the second lid 52 faces the reed switch 51.

The second lid body 52 is opened and closed when the biofilm filtration tank 17 and the elution tank 16 are checked, and the reed switch 51 is turned off when the second lid body 52 is opened. By this signal, the control circuit 56, which will be described later, stops only the power supply device 22, and operates the power supply device 22 by mounting the second lid body 52. As shown in FIG.

54 is a third opening for the check opening installed in a position opposite to the sterilization device 32, 55 is a chlorine system to the sterilization device 32 as a third lid body to open and close the third opening for opening 54 freely. It is supposed to open and close when supplying medicine.

56 is a control circuit for controlling the first blower 14, the second blower 24, the third blower 36, the power supply device 22, the pump 30, and the like.

In this way, the sewage discharged from the home flows into the first anaerobic tank 5 from the inlet 6.

The first anaerobic filtration phase (7) disposed in the first anaerobic tank (5) removes relatively coarse, large solids and contaminants, such as toilet paper in sewage, and can smoothly process in each treatment tank to be introduced next. Pretreatment is carried out so as to anaerobicly decompose the removed solids, contaminants, and sewage passing through the first anaerobic filtration phase (7) by the action of anaerobic microorganisms, thereby reducing the BOD and at the same time Is deposited at the bottom of the first anaerobic tank (5).

The organic nitrogen is anaerobicly decomposed into ammonia nitrogen. As new sewage flows into the first anaerobic tank 5, the anaerobic sewage from the first anaerobic tank 5 flows into the second anaerobic tank 10 through the aeration pipe 8. As the new sewage flows into the second anaerobic tank 10, the sewage passing through the second anaerobic filtration 11 is caused by the action of anaerobic microorganisms that inhabit the second anaerobic filtration 11, such as suspended solids (SS). While anaerobic decomposition of organic matter reduces BOD, sludge generated by decomposition of sewage is deposited at the bottom of the second anaerobic tank 10.

In addition, organic nitrogen by anaerobic microorganisms is anaerobicly decomposed into ammonia nitrogen.

The sewage anaerobicly decomposed by the action of anaerobic microorganisms inhabiting the second anaerobic filtration phase 11 above the second anaerobic filtration phase 11 flows into the quantitative pressure chamber 12 from the intake pipe 13.

When air is supplied from the first blower 14 into the fixed flow rate chamber 12, the water intake pipe 13 is closed by the backflow check valve, and the sewage in the fixed flow rate chamber 12 is pumped due to the air pressure, It is supplied to the elution tank 16 through 15.

When a predetermined time elapses from the operation of the first blower 14, the control circuit 56 stops the first blower 14, and again determines the amount of water from the water intake pipe 13 in accordance with the pressure drop in the metering chamber 12. Sewage water is introduced into the pressure feeding chamber (12). The control circuit 56, which will be described later, operates the first blower 14 intermittently, so that a predetermined amount of sewage in the second anaerobic tank 10 can be supplied to the elution tank 16 every predetermined time.

Iron ions are eluted from the electrode 21 by supplying a DC constant current between the electrodes 21 made of iron to the sewage flowing into the elution tank 16 through the supply pipe 15 in the fixed flow rate chamber 12.

The eluted iron ions react with orthophosphoric acid and become a water-insoluble phosphorus compound and are supplied to the biofilm filtration tank 17.

The sewage in the second anaerobic tank 10 supplied in the elution tank 16 has a relatively large amount of suspended solids (SS), so that the phosphorus compound produced by the reaction of iron ions and orthophosphoric acid is blocked by the SS component. ), It is possible to promote aggregation of the phosphorus compound.

The aggregated phosphorus compound is captured by the biofilm filter material 25 in the biofilm filter tank 17.

In addition, since the discharge port 18 of the elution tank 16 is provided at the bottom of the elution tank 16, even if the sewage in the second anaerobic tank 10 having a relatively large SS component is supplied to the elution tank 16, Sludge does not stay in the tank 16. Therefore, it can be prevented that sludge stays in the elution tank 16 and contacts between the electrodes 21, resulting in a decrease in the elution efficiency of iron ions.

In addition, the control circuit 56, which will be described later, stops the first blower 14 and stops the supply of sewage from the second anaerobic tank 10 to the elution tank 16. Since the current is not supplied to the electrode 21 by stopping the power supply, power consumption is contributed to by stopping unnecessary power supply.

The elution tank 16 is arrange | positioned facing the 2nd inspection opening 50, and can open | release the 2nd lid body 52, and can easily check the elution tank 16 and replace | exchange electrode 21. FIG. .

Since the hydrogen gas generated by the electrolysis of the electrode 21 is lighter than air, the hydrogen gas tends to remain in the upper part of the elution tank 16, and there is a risk of explosion when the concentration of the hydrogen gas in the elution tank 16 rises.

Therefore, in this embodiment, the exhaust port 19 is provided above the elution tank 16, and the hydrogen gas in the elution tank 16 is supplied to the sewage in the elution tank 16 from the first acid engine 23. By discharging to the outside of the elution tank 16 with air efficiently, the explosion of the hydrogen gas concentration in the elution tank 16 is prevented by preventing the explosion.

The sewage flowing into the biofilm filtration tank 17 from the outlet 18 of the elution tank 16 aerobicly decomposes the sewage by the action of aerobic microorganisms attached to the surface of the biofilm filter material 25, and at the same time, organic phosphates, etc. Is decomposed into orthophosphoric acid to decompose ammonia nitrogen into acetic acid or nitric acid nitrogen.

In addition, sludge generated due to decomposition of sewage is retained in the biofilm filter material 25.

The sewage in the biofilm filtration tank 17 gradually became acidic, resulting in a decrease in the activity of the aerobic microorganisms inhabiting the biofilm filtration material 25, resulting in a decrease in the sewage treatment capacity. Since the sewage is made alkaline by the electrolysis of the electrode 21, the sewage is supplied from the elution tank 16, so that the sewage treatment capacity of the biofilm filtration tank 17 can be prevented from being lowered.

Sewage treated through the biofilm filter material 25 and treated by the biofilm filter material 25 is introduced into the treatment water tank 29 through the communication tube 27 by the control circuit 56 controlling the pump 30.

Sewage flowing into the treatment tank (29) flows into the disinfection tank (31) and is sterilized by a sterilization device (32) containing chlorine-based chemicals to kill bacteria such as pathogens and out of the tank (1) from the drain (33). Drained.

Water-insoluble compounds, sludges and biofilms attached to the biofilm filter material 25 are periodically controlled by the control circuit 56 to prevent the clogging of the biofilm filter material 25 so that the sewage communication pipe 27 in the treatment tank 29 is prevented. The biofilter (25) is supplied to the biofilm filter tank (17) to clean the biofilter material (25), and the phosphorus compound, sludge, and biofilm are separated from the biofilm filter material (25), and the first anaerobic tank (5) through the sludge return pipe (47). It returns to

Since the air supplied from the third blower 36 is discharged from the air outlet of the third acid pipe 35, the sewage in the treatment water tank 29 flows into the inflow chamber 38 of the water fountain measuring device 37, thereby causing the intermediate chamber ( 40 is rectified and flows into the first and second fountain chambers 42 and 42.

The sewage flowing into the first fountain chamber 41 is returned to the first anaerobic tank 5 through the second conveying pipe 43, and the nitric acid or nitric acid nitrogen in the sewage returned to the first anaerobic tank 5 is It is reduced by the denitrification bacteria which exist in the 1st anaerobic tank 5, and it dissipates and removes in air as nitrogen gas.

In the embodiment of the present invention, when the electrode 21 made of iron is immersed in the sewage in the elution tank 16 for a long time, an oxide film is formed on the surface of the electrode to passivate and the elution of iron ions gradually decreases. The dephosphorization performance is lowered.

Therefore, it is preferable that the DC constant current is supplied between the pair of steel electrodes so that the current is switched in polarity every predetermined time.

An oxide film is formed on the iron surface on the anode side for a long time, but the iron surface on the cathode side is cleaned by hydrogen gas generated from the cathode steel and no oxide film is generated.

Therefore, the oxide film is formed on the iron surface on the anode side, so that the polarity can be switched at a time interval until the elution of the iron ions decreases, so that the elution of the iron ions can be maintained almost constant and the dephosphorization performance is kept constant. There is a number.

In this configuration, since the two electrodes are made of iron, iron ions are always eluted from the iron serving as the anode side electrode and supplied to the treated water, so that the dephosphorization performance can always be kept constant.

In addition, by using a steel material on at least the anode side of the electrode, a DC constant current is supplied between the two electrodes, and the oxide film generated on the surface of the anode side steel material can be peeled off by increasing the supply current in a pulse state every predetermined time. In addition, the elution of the iron ions can be kept almost constant, so that the dephosphorization performance can be kept constant.

In addition, a DC constant current may be supplied between the pair of steel electrodes, and the current may be switched at every predetermined time and the supply current may be increased in a pulsed state.

If the time to polarity change is long, an oxide film is formed on the iron surface on the anode side, and the oxide film can be peeled off by hydrogen gas by switching the polarity, but it takes some time until the oxide film is peeled off. Since the electrical resistance until the oxide film is peeled off is large, power consumption may increase.

Therefore, as described above, by increasing the supply current in a pulse state, the oxide film on the iron surface switched from the anode to the cathode can be removed in a short time, and the increase in power consumption can be prevented.

In the embodiment of the present invention, iron is used for both electrodes as an electrode for supplying a DC constant current to elute iron ions, but iron is used for the anode side, and the electrode for the cathode side is made of an insoluble material such as titanium or platinum. You may comprise.

In the embodiment of the present invention, iron is used for the two poles as an electrode for supplying a DC constant current to elute iron ions, but may be configured using aluminum.

According to the configuration of claim 1 of the present invention, an elution tank can be provided in the effluent supply path from the anaerobic tank to the biofilm filtration tank, and the configuration can be simplified, and at the same time, water insoluble phosphorus (SS component) in the anaerobic tank is used. Since the compound can be clustered to promote aggregation, phosphorus removal efficiency can be improved.

In addition, by supplying alkaline sewage flowing out of the elution tank to the biofilm filtration tank, there is an effect that the deterioration of the sewage treatment capacity of the biofilm filtration tank can be prevented.

According to the structure of claim 2 of the present invention, an elution tank can be provided in the effluent supply path from the anaerobic tank to the biofilm filtration tank, and at the same time, the SS component in the anaerobic tank is aggregated to aggregate the water-insoluble compound. Can promote phosphorus removal efficiency.

In addition, by supplying alkaline sewage flowing out of the elution tank to the biofilm filtration tank, it is possible to prevent the deterioration of the sewage treatment capacity of the biofilm filtration tank, and to prevent the deposition of sludge in the elution tank to prevent the deterioration of the ion dissolution efficiency from the electrode. It can be effective.

According to the structure of Claim 3 of this invention, there exists an effect which can make repair and repair of an elution tank easy through an opening for inspection.

According to the configuration of claim 4 of the present invention, it is possible to prevent unnecessary electricity to be applied to the electrode to suppress the consumption of electric power, thereby reducing the electric charge.

Claims (4)

Anaerobic tank (10) for anaerobic sewage treatment, biofilm filtration tank (17) having a biofilm filtration device for aerobic treatment of anaerobic sewage treatment in the anaerobic tank, and a treatment tank for storing sewage treated in the biofilm filtration tank (17). 29 and an elution tank 16 for supplying a current to the electrode 21 to elute iron ions or aluminum ions, and the sewage in the anaerobic tank 10. Sewage treatment apparatus characterized in that the transfer means for installing the transfer to the biofilm filtration tank (17) through the elution tank (16). Anaerobic tank (10) for anaerobic sewage treatment, biofilm filtration tank (17) having a biofilm filtration device for aerobic treatment of anaerobic sewage treatment in the anaerobic tank, and a treatment tank for storing sewage treated in the biofilm filtration tank (17). 29) and an elution tank 16 for supplying a current to the electrode 21 to elute iron ions or aluminum ions, and having an electrode 21 made of iron or aluminum. At the same time as the biofilm filtration tank 17, the discharge port 18 is formed at the bottom of the elution tank 16, and a transfer means for supplying the sewage in the anaerobic tank 10 is provided in the elution tank. Iron elutes or aluminum ions to the sewage in the anaerobic tank supplied to the elution tank 16 by the transfer means to be returned to the biofilm filtration tank 17 through the outlet 18 at the bottom of the elution tank 16. Sewage treatment apparatus, characterized in that. The method according to claim 1 or 2, And a lid 52 for opening and closing the inspection opening 50 in the biofilm filtration tank 17 provided above the biofilm filtration tank 17 and freely opening and closing the inspection opening 50. Sewage treatment apparatus characterized in that the (16) is arranged in the vicinity of the opening 50 for the inspection. The method of claim 2, And a control means (56) for stopping the supply of current to the electrode (21) when the transfer means stops.