KR100440197B1 - The System of for the using Recycled of Dredged Soils - Google Patents

Abstract

The present invention recycles dredged soil for use as a substitute for sand in the domestic market suffering aggregate aggregates by washing and sorting dredged soil generated in a large amount during dredging of sewage pipes and recycling useful materials such as sand contained in dredged soil as construction materials. It relates to aggregate screening and washing water purification system for.

The system of the present invention comprises a sorting / washing process for separating the sedimentary soils into gravel, sand and foreign matters using a rotating drum with a mined;

In the sorting / washing process, the sand supplied to the storage tank is guided to the cyclone by a pump, causing vortices to be washed at the center, and a classifier having an inclined front downward to dehydrate the sand discharged from the cyclone. A sand unit process of obtaining sand while passing through;

A sediment concentration tank process in which water containing sludge from the separator, cyclone and classifier is purified through a precipitation concentration tank;

The sludge discharged through the precipitation concentration tank process is made of a filter press process that is pressed into a filter press to remove moisture to form a cake.

Description

Sand Screening and Dredged Soils of Dredged Soils {The System of for the using Recycled of Dredged Soils}

The present invention extracts useful materials such as soil and gravel contained in dredged soil through a certain process in the dredging process of sewage pipes and recycles them as construction materials, and utilizes them as a substitute for sand in the domestic market suffering aggregate aggregates. It relates to an aggregate screening and washing water purification system of dredged soil.

As is well known, due to urban expansion and industrial development, the increase of household sewage and factory wastewater is causing, and sewage which absorbs and treats living sewage and various kinds of sewage becomes an essential element in urban facilities. have.

As such sewage pipes not only have daily sewage but also a large amount of rainwater, foreign matter such as aggregates, paper, leaves, soil, etc. on the road is mixed in the process of inflow to form sediments in the sewer pipes.

These sediments not only impede the smooth flow of sewage but also cause odor due to sewage stagnation and increase the flood damage in flood.

Therefore, due to these problems, sediment of sewage pipes are periodically dredged to facilitate the smooth flow of sewage, but dredged soil generated during the dredging process contains a large amount of aggregate or sand that can be usefully used as construction materials. It is a situation where a simple landfill is not proposed to deal with this.

Due to this situation, the necessity of conducting research on efficient treatment method to reduce the amount of dredged sludge by additionally reusing soil from construction materials through intermediate treatment process in lower level soils.

The present invention prevents the waste of resources due to simple landfill disposal by processing the dredged soil by a certain system, and at the same time prevents the cause of environmental destruction and at the same time utilizes it as a useful construction material, the process of processing The purpose is to provide an aggregate screening and washing water purification system for dredged soil to clean and recycle the water generated from

The overall system of the present invention for achieving the above object is the sorting / washing process for separating the sedimentary soils into gravel, sand and foreign matters using a rotating drum with a mined;

In the sorting / washing process, the sand supplied to the storage tank is guided to the cyclone by a pump, causing vortices to be washed at the center, and a classifier having an inclined front downward to dehydrate the sand discharged from the cyclone. A sand unit process of obtaining sand while passing through;

Water containing sludge from the sorting machine, cyclone and classifier is passed through the sedimentation concentration tank and the sedimentation concentration tank process is purified;

The sludge discharged through the precipitation concentration tank process is made of a filter press process that is compressed into a filter press to remove moisture to form a cake.

Hereinafter, the overall system of the present invention and specific effects obtained therefrom will be described in detail with reference to the accompanying drawings.

1 is a flow chart of the recycling system of the present inventors

2 is an overall system flow chart of the present invention.

3 is a cross-sectional view illustrating the operating principle of the sand unit

Figure 4 is a cross-sectional view illustrating the configuration of the precipitation concentration tank of the present invention

5 is a configuration diagram of a sludge treatment system.

<Description of the symbols for the main parts of the drawings>

One… Hopper 2... Cylindrical drum 3a... Screen 4... Selector

5... Washing machine 6... Storage tank 7... Cyclone 8... Dewatering Screen Body

9... Recycling box 10... Sand unit 11... Pump 15... Sedimentation concentration tank

16... In between 20.. Filter press A… Sorting / Washing Process

B… Sand Unit Process C… Precipitation Concentration Process D…. Filter press process

1 is a flow chart of the recycling system of the lower level soil of the present invention, Figure 2 is a flow diagram of the entire system of the present invention, Figure 3 is a cross-sectional view illustrating the principle of operation of the sand unit, Figure 4 illustrates a configuration state of the precipitation concentration tank of the present invention. 5 is a configuration diagram of the sludge treatment system.

As illustrated in the figure, the overall system for treating sewage soil in the present invention is a sorting / washing process (A) for sorting the gravel and sand and various foreign substances contained in the dredged soil stacked on the sewer pipe, and the sorting / A sand unit process (B) for supplying the sand obtained by the washing process (A) to the sand unit to extract the high quality sand, and a precipitation concentration step (C) for cleanly purifying the washing water generated in the process of extracting the sand; , By pressing the sludge precipitated in the precipitation concentration step to remove the water contained in the formed by a filter press step (D).

As shown in FIGS. 1 and 2, the sorting / cleaning process (A) includes a sorting machine 4, a screen 3a, and a washing machine 5, and includes gravel, sand, and foreign matter, which constitute a lower level soil. The rotating drum type and the plane vibration type are mainly used as a method for separating the powder into the powder.

The rotary drum type has the advantages of continuous operation, durability, processing capacity, and maintenance, etc., and its operation principle is to inject the dredged soil into the hopper 1 to rotate the cylindrical drum 2 by the driving means. At the same time when the washing water is sprayed, the sand or clay components stacked on the outer surface such as gravel is washed away and discharged to the outside through the outlet provided on one side of the cylindrical drum (2).

In the sorting process, gravel, foreign matter and sand are sorted to discharge the gravel to the outside. The gravel is transferred to a grinder using a conveyor belt, crushed, and then separated into useful components through the sorting process or supplemented by road construction. It is used as a base material or as a backfill material for buildings or structures.

Meanwhile, the sand sorted and discharged by the sorter (4) to which the cylindrical drum (2) is added is introduced into the washing machine (5) together with the washing water, and the sand having a predetermined particle size may be sorted before being introduced into the washing machine (5). The impurity is completely removed by washing water while being rotated in the cylindrical drum 2 provided with the screen 3a so as to be supplied to the sand unit 10 to be described later.

The sand unit process (B) performed next is a process of sorting the sand obtained by the sorting / cleaning process (A) using the sand unit 10, The structure of the sand unit 10 is shown in FIG. As described above, the storage tank 6 for storing the sand supplied by the conveyor belt after the sorting / cleaning process A is completed, and the sand having the predetermined particles by receiving the sand and water of the storage tank 6. And a cyclone (7) for separating the clay component, a dewatering screen body (8) for discharging water contained in the sand separated from the cyclone (7), and storing the muddy water supplied from the cyclone (7) It is composed of a recycling box (9).

Its operating principle is that the sand and water conveyed by the conveyor belt are put into the storage tank 6, and the pump P1 mounted on the supply pipe P connecting the storage tank 6 and the cyclone 7 is stored. Sand and water stacked on the bottom of the tank (6) is to be pumped up to the cyclone (7).

The sand and water reaching the cyclone (7) vortex in the center so that more than 65 pure sand is centrifuged along the conical wall and fed to the dewatering screen body (8).

On the other hand, the dewatering screen main body 8 is assembled with a thin long hole polyurethane net with an inclination of 5 ° upwards, and 45 ° linear motion is generated by two vibrators 8a to dewater to a thickness of about 150 to 250 mm. It is dropped into the chute (S) and recycled.

In the sand unit process (B), the muddy water of the recycling box 9 filled with the muddy water containing a large amount of clay is supplied to the precipitation concentration tank 15 via the pipe 9a to precipitate for a predetermined time. The process (C) is performed, which is configured as shown in FIG. 4, and operates according to the resistance rotational resistance value of the scrap wave, which depends on the sludge concentration at the bottom.

This means that if the concentration is overloaded, the scrapes will automatically rise and descend with gradually becoming softer.

And the sludge pump 11 is operated according to the resistive rotational power of the scrap wave, and thus the pump concentration is in an optimal state to increase the dewatering efficiency of the filter press 20.

On the other hand, the powdered coagulant sedimentation agent and water are mixed in an appropriate ratio, dissolved in a dissolution tank, transported and stored in a aging tank 12, and pumped and supplied to the precipitation concentration tank 15.

The sedimentation enrichment tank 15 is characterized by its simple structure and small size, so that it is easy to install, fully automatic operation is possible, and main parts are standardized, so maintenance is easy and operation cost is low.

Meanwhile, the washing water discharged from the washing machine and the sand unit is subjected to the following purification system.

Firstly, the wash water is transferred to the sedimentation concentration tank through the steel pipe, whereby heavy particles are precipitated by their own weight.

In general, impurities contained in the medium are suspended, colloidal, or dissolved depending on the particle size. The suspended solids are easily precipitated by their own weight in the precipitation, but the colloids are charged with electricity, so they are not easily filtered and have brown motion. Does not precipitate.

In this way, a flocculent precipitant is added to the colloidal aggregates by reducing the zeta potential by dropping the opposite charge material of the colloidal particles or by changing the pH in the symbol water of the precipitation concentration tank containing the colloidal particles.

Put the sodium hydroxide and aluminum sulfate, which are representative flocculation sedimentation agents, into the precipitation concentration tank and observe the state of overlying symbolic water.

Precipitate concentration tank 15 may be composed of a single settling tank is added to the coagulant at a time difference or may be composed of two or more settling tank can be installed in each of the coagulant tank.

When the treatment capacity is large, it is preferable to divide the secondary settling tank into two or more settling tanks. After colloidal coagulation and sedimentation in the secondary sedimentation tank, relatively clean water is moved along the water channel to the recovery tank.

In the recovery tank, the excess water from the sedimentation concentration tank 15 and replenishment water for replenishing the lost water through the washing process are stored, and the replenishment water is replenished by pumping uncontaminated river water or groundwater with a pumping pump.

The washing water stored in this way is pumped to a pumping pump and pumped back to the sorter to be recycled, while the sludge of the high water content precipitated in the precipitation concentration tank 15 is shown in FIG. 20 is supplied to and stored in the passage 16 for storing the sludge constituting the filter press 20 is again passed through the filter press process to produce a sludge cake by dehydration at high pressure.

The characteristics of the filter press 20 used in this process are dehydration at high pressure, so the moisture content of the cake is about 25% or lower, and sludge such as mud and foreign substances generated during the washing process and sludge such as waste can be processed. Unmanned operation is possible because it is operated by simple, easy maintenance and is equipped with automatic washing device.

Aggregates and sands obtained by the above process showed similar specific gravity values as existing sands, and useful resources that meet the criteria of all heavy metal items in the Soil Environment Conservation Act were obtained.

In addition, the cleaning degree obtained through the predetermined screening / washing process showed that organic impurities were below the allowable level, and the mortar compressive strength used as the fine aggregate was also satisfied with the domestic standard and can be used as construction material.

In other words, the lower level soil is obtained through a predetermined sorting and cleaning process, and the sand can be used as a construction material.

Meanwhile, the wastewater generated by the washing system developed by the headquarters is removed from the concentrated sedimentation basin because insoluble granules, which have a greater proportion of water, account for most of the suspended solids.

In addition, if the remaining colloidal fine particles are removed by a flocculation sedimentation operation, a water quality satisfying the effluent level standard can be obtained.

As described above, the lower level soil is relatively homogeneous compared to the existing construction wastes and has a relatively easy recycling because it contains less harmful wastes. Thus, fine aggregates obtained through the screening / washing process according to the present invention are filled or soiled. It can be used as a construction material that requires the same strength as concrete aggregates as well as improved materials.

As described above, the present invention selects gravel having relatively coarse particles while sorting and washing the lower level soil, and sand generated in this process is supplied to the sand unit to be reclaimed to obtain high quality sand and at the same time, Water containing components are purified and recycled by sedimentation tanks, and clay components are molded into cakes by filter presses and discarded.They obtain useful materials from lower level soils and discharge small amounts of wastes. It is a useful invention that can contribute to prevention.

Claims (1)

A sorting / washing process for separating the sedimentary soils into gravel, sand and foreign matters using a rotating drum equipped with mining; In the sorting / washing process, the sand supplied to the storage tank is guided to the cyclone by a pump, causing vortices to be washed at the center, and a classifier having an inclined front downward to dehydrate the sand discharged from the cyclone. A sand unit process of obtaining sand while passing through; Water containing sludge from the sorting machine, cyclone and classifier is passed through the sedimentation concentration tank and the sedimentation concentration tank process is purified; The sludge discharged through the sedimentation concentration tank process is compressed into a filter press to remove the moisture to form a cake press for the aggregate selection and washing water purification system, characterized in that made of a filter press.