JP2022115772A - Elution wastewater treatment equipment after synergistic elution and remediation of organochlorine pesticide-contaminated soil - Google Patents

Abstract

[PROBLEMS] To provide an elution wastewater treatment apparatus after synergistic elution and remediation of organochlorine pesticide-contaminated soil, which has a rational structure, is easy to operate, has a high degree of automation, and contributes to the spread of wastewater treatment by elution. The method includes a sludge removal tank and a clarification tank arranged side by side, and at the same time, inside the sludge removal tank, a sludge removal module is provided for removing the removed sludge and solid waste, and inside the clarification tank, Equipped with a purification module that purifies and filters with chemicals, the standard for direct discharge of treated wastewater has been reached, the structure of the device is rational, easy to operate, and the degree of automation is high, contributing to the spread of wastewater treatment by elution. . [Selection drawing] Fig. 3

Description

TECHNICAL FIELD The present invention relates to the technical field of treating soil contaminated with organochlorine pesticides, and more specifically to an elution wastewater treatment apparatus after synergistic elution and remediation of soil contaminated with organochlorine pesticides.

Organochlorine pesticides have a stable structure, are highly toxic, and are difficult to decompose in soil. are long lasting, high contamination hazards, high human health and ecological risks, and currently have stringent and difficult requirements for remediation techniques and processes for organochlorine pesticide-contaminated sites. Site contaminated soil has become a 'chemical time bomb', a serious threat to human health and environmental safety, and a soil environmental problem that urgently needs to be resolved. The synergistic chemical leaching method has significant technical and economic advantages in that it can rapidly remediate soils contaminated with highly concentrated, highly toxic organochlorines. However, the problem of treatment and discharge of leaching wastewater after leaching and remediation has become a new and urgent issue.

According to preliminary estimates, the soil remediation and wastewater treatment market will reach tens of trillions of yuan in the next few years,
Accelerating the research and development of remediation technology and equipment is very urgent to meet the needs of the wastewater treatment market and improve the technical level of soil remediation and wastewater treatment, China patent CN20
4529540U discloses a chlorinated methane organochlorine wastewater treatment system comprising a sewage reactor, the feed end of which is injected with sulfuric acid, hydrogen peroxide, and wastewater for motor agitation,
The reaction is then completed and introduced into and through the reaction wastewater pool, the inclined plate settler
Carry out secondary treatment for wastewater to prevent it from causing secondary pollution. Hydrogen peroxide catalytic oxidative flocculation method is used to treat chlorinated methane organochlorine wastewater, which not only discharges organochlorine wastewater to the standard, but also does not cause secondary pollution after using hydrogen peroxide. However, the treatment effect is relatively stable, single, and the treatment effect is not high for eluted wastewater containing many impurities and difficult to decompose.

Therefore, it is necessary to provide a device that effectively treats eluted wastewater after synergistic elution and remediation of soil contaminated with organochlorine pesticides. Properly treat chlorine-based pesticide residues, can meet the standard of direct discharge, and avoid environmental pollution.

In order to solve the above technical problems, the present invention provides an elution wastewater treatment apparatus after synergistic elution and remediation of organochlorine pesticide-contaminated soil.

The technical solutions of the present invention are as follows. The elution wastewater treatment equipment after synergistic elution and remediation of organochlorine pesticide-contaminated soil is equipped with a sludge removal tank and a clarification tank arranged side by side and communicated with each other through a connecting pipe.
A first partition plate is horizontally installed in the middle of the sludge removal tank, a water passage area is provided in the sludge removal tank below the first partition plate, and a sludge removal module is further provided inside the sludge removal tank. provided that
It consists of a first rotating shaft positioned at the bottom of the water passage area below the first partition plate, and a second rotating shaft and a third rotating shaft positioned on both sides above the first partition plate. , a rotating axle assembly for supporting a toothed rake grid;
a toothed rake grid for collecting sludge and waste; is clamped by rolling brushes arranged vertically on both sides of the rake grid, and from a state in which the toothed rake grid is arranged horizontally with respect to the first partition plate to can be changed to be vertically oriented,
A linear collection tank is slidably connected to the upper surface of the first partition and provided on the first partition below the toothed rake grid located at the second axis of rotation for collecting the scraped material. an annular recovery tank for
A second partition plate is horizontally installed in the middle part of the purification tank, and a purification module is further installed inside the purification tank, which includes:
a wastewater-transporting S-shaped liquid transport pipe having a multi-stage vertical cross section and having one end connected to the connecting pipe and the other end communicating with the purification groove below the second partition plate in the middle part of the purification tank; ,
a filtering mechanism for purifying wastewater, said filtering mechanism being fixedly fitted in the middle part of the liquid-transporting pipe through which the liquid-transporting pipe penetrates vertically, said filtering mechanism being fixedly connected to the liquid-transporting pipe. an outer shell and an inner turntable positioned inside the outer shell and rotatably connected to the outer shell; through holes are provided at connection points of the outer shell with the liquid transport pipes in each stage; A plurality of sets of filtration holes having the same diameter as the through holes are provided on the turntable at regular intervals in the circumferential direction. Each set of filter holes is provided with a detachable filter net, the inner turntable is connected to the turntable block located on the inner upper surface of the clarification tank through two sets of connecting rods, and the turntable is The table block is driven to rotate by a rotary motor located therein.

Further, first teeth are provided on the outside of the outer ring wall of the annular recovery tank and the inside of the inner ring wall of the annular recovery tank, respectively, and the first tooth is provided at a position corresponding to the inner side of the inner ring wall of the annular recovery tank of the first rotating rod. 1
The outer bottom surface of the annular recovery tank is provided with an annular ring slidably connected to an annular groove provided in the upper surface of the first partition plate. first tooth and second
The meshing of the teeth rotates the annular recovery tank, and the installation of the annular ring and the annular groove prevents the annular recovery tank from shifting during rotation.

Further, the filter hole group is divided into an inner filter hole near the inside of the inner turntable and an outer filter hole near the outside of the inner turntable, and between the inner filter hole and the outer filter hole, to the outside of the inner turntable. An extending chute is provided, the filter nets provided on the inner filter hole and the outer filter hole are connected by a set of fixed rods, the rear end of the filter net of the outer filter hole is provided with a protruding screw groove, and the inner The filter net front end of the filter hole is provided with a block engaged with the inner turntable, and one side of the outer wall of the outer shell is provided with a set of openings for communicating with the inner turntable and replacing the filter net. . With the above installation, the compressed waste water can be further collected to avoid pollution, and at the same time, the above installation can more conveniently replace the filter hole set.

Furthermore, a first stirring paddle positioned within the water passage area is connected to the lower part of the rolling brush via a first rotating rod passing through the first partition plate, and a second stirring paddle is positioned in the center of the lower part of the outer shell. A second stirring paddle located in the lower cleaning channel of the second partition is connected via a second rotating rod passing through the partition.

In addition, a water inlet and a water outlet are provided on both side walls of the sludge removal tank at positions corresponding to the water passage areas, respectively, to realize continuous and uninterrupted wastewater treatment work, corresponding to the lower part of the second partition plate. A chemical inlet is provided on the outer wall of the clarification tank at a position where the chemical is added and the wastewater can be treated more thoroughly by the second stirring paddle. is inclined and one low end is the waste collecting end, so that the sludge and waste collected by the toothed rake grid can enter and be discharged, and the water pump on the connecting pipe is provided, and the upper surface of the outer shell is provided with a rotation groove for rotating the connecting rod so that the rotation of the connecting rod is not hindered.

Furthermore, a compression mechanism for compressing the mud cake is connected above the annular recovery tank and the linear recovery tank, the compression mechanism includes a return chute provided on the side remote from the sludge removal module, the return chute being , in the annular recovery tank and at the ends of the linear recovery tank, correspondingly provided with a set of blade wheels for scraping the waste,
Four sets of blades are provided on the blade wheel evenly spaced, and the inner bottom and sidewall of the return chute are provided with slots for rotating the blades, respectively;
A push rod motor is provided on the outer wall at the rear end of the return chute, the output end of the push rod motor is connected to the push plate via an expansion rod penetrating the outer wall of the return chute, and the push plate is connected to the return chute. A top plate is slidably connected to the push plate, a spring groove is provided at the bottom of the top plate, a protrusion is provided at the top of the push plate and is slidable in the spring groove, and the protrusion is connected to a spring provided at one end in the spring groove;
A movable baffle is provided at the front end of the return chute, the movable baffle is slidably driven by a drive motor located on the upper surface of the first partition plate, and two sets of blade wheels are mounted on the upper surface of the first partition plate. Driven to rotate synchronously by a blade wheel motor located between two sets of blade wheels in the return chute, a plurality of filtering holes are provided at the bottom near the movable baffle at the front end of the return chute, and the first below the filtering holes A waste water chute is provided on the upper surface of the partition plate.

The compression mechanism design can compress sludge and waste, expelling excess water while saving space, promoting recycling, and compressing and collecting various sizes of sludge and waste.

Beneficial effects of the present invention are as follows.
(1) The elution wastewater treatment apparatus of the present invention can effectively treat elution wastewater after synergistic elution remediation of organochlorine pesticide-contaminated soil, remove sludge and solid waste, and purify and filter with chemicals. combined, the wastewater after treatment reaches the standard of direct discharge, the structure of the equipment is reasonable, the operation is easy, and the degree of automation is high, which contributes to further popularization.
(2) The leaching wastewater treatment equipment of the present invention can effectively collect sludge and solid waste, compress it into a mud cake by a compression mechanism, save storage space, discharge excess water, and collect contribute more.
(3) The elution wastewater treatment apparatus of the present invention filters wastewater after impurities have been removed by the provided filtration mechanism, and filters the wastewater multiple times through a plurality of sets of filtration holes to further improve the filtration effect. The filter hole set can be replaced at any time to avoid the deterioration of the filtering effect due to clogging of the hole set.

1 is a schematic diagram of the overall structure of a sludge removal tank and clarification tank of the present invention; FIG. It is a schematic diagram of the internal structure of the sludge removal tank of the present invention. 1 is a schematic diagram of the sludge removal module structure of the present invention; FIG. FIG. 4 is a schematic diagram of the horizontal to vertical transition structure of the toothed rake grid of the present invention; 1 is a schematic diagram of the structure of a compression mechanism of the present invention; FIG. FIG. 4 is a schematic diagram of the structure of the push plate and top plate of the compression mechanism of the present invention; 1 is a schematic diagram of the internal structure of a purification tank of the present invention; FIG. 1 is a schematic diagram of a purification module structure of the present invention; FIG. 1 is a schematic diagram of the internal structure of a purification module of the present invention; FIG.

[Description of symbols]
1 sludge removal tank 11 first partition plate 111 annular groove 12 rotating shaft assembly 121 first rotating shaft 122 second rotating shaft 123 third rotating shaft 13 toothed rake grid 14 water passage area 15 rolling brush 16 annular recovery Tank 161 First tooth 162 Annular ring 17 Linear collection tank 18 First rotary rod 181 Second tooth 19 First stirring paddle 2 Purification tank 21 Liquid transport pipe 22 Second partition plate 23 Purification groove 24 Turntable block 25 Drug inlet 26 Second rotating rod 27 Second stirring paddle 3 Compression mechanism 31 Blade wheel 311 Blade 32 Return chute 321 Slot 33 Push rod motor 34 Telescopic rod 35 Push plate 351 Projection 36 Top plate 361 Spring groove 362 Spring 37 Movable Baffle 38 Filter Hole 39 Waste Water Chute 4 Filter Mechanism 41 Outer Shell 411 Opening 412 Rotating Groove 42 Inner Turntable 421 Chute 43 Through Hole 44 Filter Hole Set 441 Inner Filter Hole 442 Outer Filter Hole 45 Filter Net 451 Screw Groove 452 Block 46 Connecting Rod 47 fixed rod 5 connecting pipe

The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and the terms "before and after", " Left and Right are used only to describe purpose and cannot be understood to indicate or imply relative importance or to imply the position of the technical features shown.

Example 1
As shown in Fig. 1, the elution wastewater treatment equipment after synergistic elution and restoration of organochlorine pesticide-contaminated soil is
Equipped with a sludge removal tank 1 and a clarification tank 2 arranged side by side and communicated with each other through a connecting pipe 5. A water pump is provided on the connecting pipe 5, and the water pump is a SYL type single-stage single-suction vertical centrifugal. using a pump
1, sludge removal tank 1
As shown in FIG. 2, a first partition plate 11 is provided horizontally in the middle of the sludge removal tank 1, and a water passage area 14 is provided in the sludge removal tank 1 below the first partition plate 11, A water inlet and a water outlet are provided on both side walls of the sludge removal tank 1 at positions corresponding to the water passage areas 14, respectively, so as to realize continuous and uninterrupted wastewater treatment work, and sludge is removed inside the sludge removal tank 1. A module is further provided, which is
As shown in FIGS. 2 and 3, a first rotating shaft 121 located at the bottom of the water passage area 14 below the first partition plate 11 and second rotating shafts 121 located on both sides above the first partition plate 11 respectively. a rotating shaft assembly 12 for supporting the toothed rake grid 13, which is composed of a rotating shaft 122 and a third rotating shaft 123;
A toothed rake grid 1 for collecting sludge and waste, as shown in Figures 2, 3 and 4
3 and a toothed rotatably fitted outside the first, second and third rotary shafts 121, 122, 123 and positioned between the second and third rotary shafts 122, 123. The rake grid 13 is clamped by rolling brushes 15 arranged vertically on both sides thereof, and the toothed rake grid 13 is arranged horizontally with respect to the first partition plate 11 to the first partition plate 11 .
and the toothed rake grid 13 is made of commercially available GSH
The outer structure of the P140cm toothed rake grid is adjusted, and the direction of both sides is changed to transition from the horizontal state to the vertical state to suit the above equipment, and the lower part of the rolling brush 15 is the first partition. connected to a first stirring paddle 19 located within the water passage area 14 via a first rotating rod 18 penetrating the plate 11;
2 and 3, an annular recovery tank 16 slidably connected to the upper surface of the first partition plate 11 for recovering the scraped material, and an outer ring wall of the annular recovery tank 16; A first tooth 161 is provided on the outer side and the inner side of the inner ring wall, respectively, and a second tooth 181 is meshed with the first tooth 161 at a position corresponding to the inner side of the inner ring wall of the annular recovery tank 16 of the first rotating rod 18 . is provided, and the annular groove 1 provided on the upper surface of the first partition plate 11 on the outer bottom surface of the annular collection tank 16
11 is provided with an annular ring 162 slidably connected to the first tooth 161 and the second tooth 181 .
Rotate the annular collection tank 162 by meshing, and prevent the annular collection tank 162 from shifting during rotation by installing the annular ring 162 and the annular groove 111,
As shown in FIG. 3, a linear recovery tank 17 is provided on the first partition plate 11 below the toothed rake grid 13 located on the second rotation axis 122, and the linear recovery tank 17 is inclined at 15°. The sludge and waste collected by the toothed rake grid 13 can enter and exit because the straight collecting tank 17 is arranged at an angle and the lower end is the terminal for collecting the waste. can be
2, purification tank 2
As shown in FIG. 7, a second partition plate 22 is horizontally installed in the middle part of the purification tank 2, and a purification module is further installed inside the purification tank 2, which includes: a.
1-liquid transport pipe 21
As shown in FIGS. 7 and 8, the liquid transport pipe 21 transports waste water and has a vertical cross-section of a multi-stage S-shape. A port 25 is provided to locate within the cleaning channel 23 below the second partition 22 via a second rotating rod 26 penetrating the second partition 22 centrally in the lower portion of the outer shell 41 . 2 stirring paddles
7, the waste water is treated more thoroughly by the second agitating paddle 27 in conjunction with the injection of chemicals, one end of the liquid transport pipe 21 is connected to the connecting pipe 5, and the other end is in the middle part of the clarification tank 2. communicating with the purification groove 23 below the second partition plate 22,
2 filtering mechanism 4
As shown in FIGS. 8 and 9, a filtration mechanism 4 for purifying wastewater is fixedly fitted in the middle of a liquid transport pipe 21, and the liquid transport pipe 21 penetrates vertically. each stage of the outer shell 41 and the liquid transport pipe 21, including an outer shell 41 fixedly connected to the transport pipe 21 and an inner turntable 42 located inside the outer shell 41 and rotatably connected to the outer shell 41; A plurality of sets of filter holes 44 having the same diameter as the through holes 43 are provided on the inner turntable 42 at regular intervals in the circumferential direction. Through the rotation of the inner turntable 42, it can correspond to the through hole 43 located on the same side in the vertical direction,
A detachable filter net 45 is provided in each set of filter hole sets 44. The filter net 45 is made of commercially available high-quality stainless steel filter screen whose outer structure is adjusted according to the size of the through hole. The inner turntable 42 is connected via two sets of connecting rods 46 to a turntable block 24 located on the inner top surface of the clarification tank 2, the turntable block 24 being rotated by a rotary motor located therein. The rotary motor is a commercially available industrial gear reduction motor, and the upper surface of the outer shell 41 is provided with a rotary groove 412 for rotating the connecting rod 46 to prevent the rotation of the connecting rod 46. There is no
The operation principle of wastewater treatment using the elution wastewater treatment apparatus after synergistic elution and remediation of the organochlorine pesticide-contaminated soil is as follows.
The eluted wastewater containing DDT after elution and restoration of contaminated soil is injected from the water inlet into the sludge removal tank 1, and the sludge and solid waste are removed by the sludge removal module,
The working principle of the desludging module is as follows:
After the wastewater undergoes secondary sludge removal treatment by the first rotating shaft 121 and the third rotating shaft 123, the toothed rake grid 13 between the first rotating shaft 121 and the second rotating shaft 122, the sludge and Most of the solid waste is pushed out as it passes through the second rotating shaft 122 and falls into the linear collection tank 17, and a small portion of the adhering sludge and solid waste falls into the toothed rake grid 13. and reach the position of the rolling brush 15, and a small amount of sludge and solid waste adhering to the toothed rake grid 13 is rubbed by the frictional force and relative movement between the toothed rake grid 13 and the rolling brush 15. Toreto Circular Recovery Tank 1
6, at the same time, the rotation of the rolling brush 15 also rotates the first rotating rod 18, rotating the first stirring paddle 19, stirring the waste water in the water passage groove, and the toothed rake grid 13 and full contact to improve removal efficiency, rotating the annular recovery tank 16 by the meshing of the second tooth 181 on the first rotating rod 18 and the first tooth 161 on the annular recovery tank 16;
After that, the sludge-removed wastewater is pressurized through the water pump from the water outlet of the sludge removal tank 1, then pumped up through the connection pipe 5 and transferred into the clarification tank 2,
The working principle of the purification module is as follows:
After the wastewater has entered the liquid transport pipe 21, it is filtered by the filtration mechanism 4, and the filtered wastewater flows into the purification groove 2.
3 and then turn on the motor controlling the rotation of the second rotating rod 26,
Stir by rotating the second stirring paddle 27, put commercially available polyacrylamide as a purifying agent from the chemical inlet 25, and purify for 24 hours,
Among them, the working principle of the filtering mechanism 4 is as follows: when the waste water enters the filtering hole group 44 in the through hole 43 through the liquid transport pipe 21, it is filtered by the filtering net 45, then the other When the three-stage liquid transport pipe 21 is sequentially filtered and further filtering work is to be performed, the rotary motor is turned on to rotate the turntable block 24, and at the same time, the connecting rod 46 is rotated into the rotary groove 412, so that the inner The turntable 42 rotates inside the outer shell 41 to switch between different sets of filtration holes 44 , the next set of filtration holes 44 moves to a position corresponding to the through holes 43 , and the filtration of the same set of filtration holes 44 . Rotate every 3 minutes to prevent clogging due to too long a time.

Example 2
This embodiment is basically the same as the first embodiment except for the following, and as shown in FIG. It is divided into an outer filtering hole 442 near the outside, an inner filtering hole 441 and an outer filtering hole 442
A chute 421 extending to the outside of the inner turntable 42 is provided between the filter nets 45 provided on the inner filter holes 441 and the outer filter holes 442 , and connected by a set of fixed rods 47 . The rear end of the filter net 45 is provided with a protruding screw groove 451 , the front end of the filter net 45 of the inner filter hole 441 is provided with a block 452 engaged with the inner turntable 42 , and the outer wall of the outer shell 41 is provided with a block 452 . , an inner turntable 42 and a set of openings 411 for exchanging filter nets 45 are provided. By the above installation, the compressed waste water can be further recovered to avoid pollution, and at the same time, the above installation can make the replacement of the filter hole set 44 more convenient.
The replacement method of the filtering mechanism 4 is as follows:
When it is necessary to replace the filter screen 45 on the filter hole set 44, use a special sampler to enter from the opening 411 to the thread groove 451, the special sampler is a long round bar with a screw at the end, After rotation, the two sets of filter nets 45 connected to the fixed rods 47 in the filter hole sets 44 can be taken out and replaced together with the screw grooves 451. In the case of the new filter nets 45, similarly, the fixed rods 47 are replaced by the sampler. The two sets of filtering nets 45 connected by are put into the filtering hole set 44 from the opening 411, the block 452 and the inner turntable 42 are engaged and fixed,
Rotate the sampler in the opposite direction to separate it from the thread groove 451 and take it out.

Example 3
This embodiment is basically the same as the first embodiment except for the following, and as shown in FIG. 3 are connected,
As shown in FIGS. 5 and 6, the compression mechanism 3 includes a return chute 32 located on the side remote from the sludge removal module corresponding to the annular recovery tank 16 and the end of the linear recovery tank 17, respectively. A set of blade wheels 31 for scraping the waste is correspondingly provided at the position where the waste is scraped off, and four sets of blades 311 are also provided on the blade wheel 31 at equal intervals to form the inner bottom and side walls of the return chute 32. to each blade 31
A slot 321 for rotating 1 is provided, and a push rod motor 33 is provided on the outer wall of the rear end of the return chute 32 , and the output end of the push rod motor 33 is connected to the telescopic rod 34 passing through the outer wall of the return chute 32 . The push plate 35 is slidably connected to the return chute 32. A top plate 36 is provided on the top of the push plate 35, and a spring groove 361 is provided on the bottom of the top plate 36. A slidable protrusion 351 is provided in a spring groove 361 on the upper part of 35 , the protrusion 351 is connected to a spring 362 provided at one end of the spring groove 361 , and a movable baffle 37 is provided at the front end of the return chute 32 . , the movable baffle 37 is slidably driven by a drive motor located on the upper surface of the first partition plate 11, the blade wheel motor is a commercially available double-ended DC motor, and the two sets of blade wheels 31 are mounted on the first Driven to rotate synchronously by a blade wheel motor located between two sets of blade wheels 31 on the upper surface of the partition plate 11, a plurality of filtering holes 38 are provided at the bottom near the movable baffle 37 at the front end of the return chute 32 to filter A waste water chute 39 is provided on the upper surface of the first partition plate 11 below the hole 38 .
The design of compaction mechanism 3 can compress sludge and waste, expelling excess water while saving space, facilitating recycling, and compacting and collecting various sizes of sludge and waste.

The working principle of the compression mechanism 3 is as follows:
The linear recovery tank 17 transports the collected sludge and solid waste under the action of gravity to the bottom blade wheels 31, the annular recovery tank 16 transports the collected sludge and solid waste to the blade wheels 31 during rotation, The blade wheel motor is turned on to drive two sets of blade wheels 31 to rotate synchronously, transporting the sludge and solid waste into the return chute, the blades on both sides of the sludge and solid waste and the bottom and sides of the return chute. The push rod motor 33 is turned on to control the telescopic rod 34 to move along the return chute 32, and the push plate 35 removes the sludge and solid waste accumulated in the two slots 321. Push the material to the movable baffle 37 at the end of the return chute 32 to press the sludge and solid waste, at the same time the protrusion 351 presses against the spring 362 and pushes the protrusion 351 until the sludge and solid waste are squeezed into a mud cake. into the spring groove 361 , the water in it is discharged to the waste water chute 39 through the filter hole 38 , the drive motor is turned on to push the movable baffle 37 outward, and then the telescopic rod 34
The pressing plate 35 is pushed to the end of the return chute 32 through the , and the squeezed mud cake is discharged and collectively collected.

Example 4
This embodiment is basically the same as the first embodiment except for the following, and differs in the number of filter hole sets 44 installed. 44 is 3 in the circumferential direction
Opened at 0°.

Example 5
This embodiment is basically the same as the first embodiment except for the following, and differs in the number of filter hole sets 44 installed. 44 is 90 in the circumferential direction
° is opened.

Example 6
This example is basically the same as Example 1 except for the following, and the components of the contaminants eluted from the contaminated soil are different. Specifically, the contaminated soil containing HCH is eluted and remedied. The eluted wastewater after sludge removal is injected into the sludge removal tank 1 from the water inlet, and the sludge and solid waste are removed by the sludge removal module. The water is pressurized through a pump and pumped into the purification tank 2 through a connecting pipe, where it is filtered and purified.

Application example of elution wastewater treatment equipment Experiment sample: elution wastewater after elution and remediation of DDT contaminated soil in a factory in this city, HCH
The elution wastewater after polluted soil elution and remediation was used as the experimental sample.
Test standards and methods: According to the determination of BHC and DDT in soil by gas chromatography GB/T 14550-2003, the following study experiments were carried out,
Examination 1 Effect on the effect of elution wastewater treatment by installing different numbers of filtration hole sets Elution wastewater after elution and remediation of DDT contaminated soil was used as an experimental sample, and in Examples 1, 4, and 5, 8, 12, and 4 sets, respectively. of filtration hole sets 44 were provided and the test results are shown in Table 1:
Table 1 List of test results for harmful substances in eluted wastewater

Conclusion: As can be seen from Table 1, in each example, the DDT content in the wastewater after treatment is significantly reduced, and the elution wastewater treatment apparatus after synergistic elution and remediation of organochlorine pesticide-contaminated soil of the present invention In this case, the wastewater containing organochlorine pesticides can be effectively treated, and among them, the DDT content in the wastewater after treatment in Example 1 is the lowest, and the DDT content in the wastewater after treatment in Example 5 is the lowest. The reduction in the content is relatively small, this is because the number of filter hole sets 44 installed is small and the harmful substances in the wastewater cannot be effectively filtered. If the DDT content is close to medium and the number of filter hole sets 44 increases, the manufacturing cost will inevitably increase, and if the number of filter hole sets 44 is too large, the frequency of failure during use will increase. A set of filtering holes 44 is the most rational.

Examination 2 Effect of elution wastewater treatment after elution and remediation of different contaminated soil Examples 1 and 6 use elution wastewater after elution and remediation of DDT-contaminated soil and elution wastewater after elution and remediation of HCH-contaminated soil. Results are shown in Table 2:
Table 2 Table of test results for hazardous substances in different elution wastewaters

Conclusion: As can be seen from Table 2 above, according to the elution wastewater treatment apparatus after synergistic elution and restoration of organochlorine pesticide-contaminated soil of the present invention, harmful substances in elution wastewater from different contaminated soils can be removed and removed. The effect was in line with expectations.
At the same time, the second embodiment adds the replacement of the filtering net 45 of the filtering mechanism 4 to the first embodiment. can be reduced and the operation and maintenance time can be shortened.
Example 3 adds a compression mechanism 3 for compressing the collected material in the annular recovery tank 16 and the straight recovery tank 17 into a mud cake compared to Example 1, and through actual treatment use, the installation of the compression mechanism 3 can reduce sludge and solid waste. Although it can effectively improve the collection processing of objects, the addition of the motor will increase the power consumption to a certain extent, and it can be selected according to the actual processing needs.

Claims (6)

Equipped with a sludge removal tank (1) and a purification tank (2) arranged side by side and communicating with each other via a connecting pipe (5),
A first partition plate (11) is horizontally provided in the middle of the sludge removal tank (1), and a water passage area (14) is provided in the sludge removal tank (1) below the first partition plate (11). is provided, and a sludge removal module is further provided inside the sludge removal tank (1),
A first rotating shaft (121) located at the bottom of the water passage area (14) below the first partition (11), and a second rotating shaft (121) located on both sides above the first partition (11) respectively. a rotating shaft set (12) for supporting a toothed rake grid (13), comprising a rotating shaft (122) of a third rotating shaft (123);
A toothed rake grid (13) for collecting sludge and waste and rotatably fitted outside the first, second and third rotating shafts (121, 122, 123). and the toothed rake grid (13) located between said second and third rotation axes (122, 123) is clamped by vertically arranged rolling brushes (15) on both sides thereof to form teeth With the rake grid (13) changed from being arranged horizontally with respect to the first partition (11) to being arranged vertically with respect to the first partition (11),
a straight line on the first partition (11) below the toothed rake grid (13) slidably connected to the upper surface of the first partition (11) and located on the second axis of rotation (122); recovery tank (
17) is provided, comprising an annular recovery tank (16) for recovering the scrapings;
A second partition plate (22) is horizontally provided in the middle part of the purification tank (2), and a purification module is further provided inside the purification tank (2),
One end is connected to the connecting pipe (5) and the other end is communicated with the purification groove (23) below the second partition plate (22) in the middle part of the purification tank (2) for transporting and longitudinal wastewater. an S-shaped liquid transport pipe (21) having multiple stages of surfaces;
a filtration mechanism (4) for purifying the waste water;
The filtration mechanism (4) is fixedly fitted in the middle part of the liquid transport pipe (21) and penetrates the liquid transport pipe (21) vertically. comprising an outer shell (41) fixedly connected and an inner turntable (42) located inside the outer shell (41) and rotatably connected to the outer shell (41); Each stage liquid transport pipe (
21) are provided with through holes (43), respectively, and the inner turntable (4
2) A plurality of sets of filtering holes (44) having the same diameter as the through hole (43) are provided at regular intervals in the circumferential direction, and each set of filtering holes (44) rotates on the inner turntable (42). A detachable filtration net (45) is provided in each set of filtration hole sets (44) vertically corresponding to the through holes (43) located on the same side through the inner turntable (42). a set of connecting rods (46)
to a turntable block (24) located on the inner upper surface of the clarification tank (2), said turntable block (24) being driven to rotate by a rotary motor located therein. Distinctive elution wastewater treatment equipment after synergistic elution and remediation of organochlorine pesticide-contaminated soil. First teeth (161) are provided on the outside of the outer ring wall and the inside of the inner ring wall of the annular recovery tank (16), respectively.
) is provided, and a second tooth (181) meshing with the first tooth (161) is provided at a position corresponding to the inside of the inner ring wall of the annular recovery tank (16) of the first rotating rod (18). is provided,
The outer bottom surface of the annular collection tank (16) is provided with an annular ring (162) slidably connected to the annular groove (111) provided on the upper surface of the first partition plate (11). 2. The apparatus for treating eluted wastewater after synergistic elution and restoration of organochlorine pesticide-contaminated soil according to claim 1. Said filtering hole set (44) includes an inner filtering hole (441) near the inside of the inner turntable (42).
) and an outer filtering hole (442) close to the outside of the inner turntable (42), extending to the outside of the inner turntable (42) between the inner filtering hole (441) and the outer filtering hole (442) A chute (421) is provided to separate the inner filtering hole (441) and the outer filtering hole (
442) are connected by a pair of fixed rods (47), and a protruding thread groove (451) is provided at the rear end of the filtering net (45) of the outer filtering hole (442). and the inner turntable (4
2) is provided with a block (452) engaged with, on one side of the outer wall of the outer shell (41),
A set of openings (
411) is provided. A first stirring paddle (19) located in the water passage area (14) is located below the rolling brush (15) via a first rotating rod (18) passing through the first partition plate (11). connected to the lower cleaning groove (23) of the second partition (22) via a second rotating rod (26) passing through the second partition (22), centrally at the bottom of said outer shell (41); ) is connected to the second agitation paddle (27) located in the inner part of the elution wastewater treatment apparatus after synergistic elution and remediation of organochlorine pesticide-contaminated soil according to claim 1. A water inlet and a water outlet are provided on both side walls of the sludge removal tank (1) at a position corresponding to the water passage area (14), and a clarification tank ( 2) is provided with a drug inlet (25) on the outer wall of the linear collection tank (17);
is arranged obliquely, a water pump is provided on said connecting tube (5) and said outer shell (41)
The elution wastewater treatment apparatus after synergistic elution and remediation of organochlorine pesticide-contaminated soil according to claim 1, characterized in that a rotating groove (412) for rotating the connecting rod (46) is provided on the upper surface of the . A compression mechanism (3) for compressing the mud cake is connected above the annular recovery tank (16) and the linear recovery tank (17), and the compression mechanism (3) is provided on the side remote from the sludge removal module. and a return chute (32), said return chute (32) having a set of blades for scraping waste in corresponding positions in the annular recovery tank (16) and at the end of the linear recovery tank (17) respectively. A wheel (31) is correspondingly provided,
Four sets of blades (311) are provided at regular intervals on the blade wheel (31), and slots (321) for rotating the blades (311) are formed on the inner bottom and side walls of the return chute (32), respectively. provided,
A pushrod motor (33) is installed on the outer wall of the rear end of the return chute (32), and the output end of the pushrod motor (33) has an extendable rod (34) passing through the outer wall of the return chute (32). connected to the push plate (35) through the push plate (35)
is slidably connected to the return chute (32) and top plate (36) on top of the push plate (35).
) is provided, a spring groove (361) is provided at the bottom of the top plate (36), and the push plate (3
5) is provided with a protrusion (351) slidable in the spring groove (361), said protrusion (3)
51) is connected to a spring (362) provided at one end in the spring groove (361),
A movable baffle (37) is provided at the front end of the return chute (32), and the movable baffle (37) is slidably driven by a drive motor located on the upper surface of the first partition plate (11). A set of blade wheels (31) is driven to rotate synchronously by a blade wheel motor located between two sets of blade wheels (31) on the upper surface of the first partition plate (11), and the return chute (32) A plurality of filtering holes (38) are provided at the bottom near the movable baffle (37) at the front end, and a waste water chute (39) is provided on the upper surface of the first partition plate (11) below the filtering holes (38). Claim 1 characterized by
3. Elution wastewater treatment equipment after synergistic elution and restoration of organochlorine pesticide-contaminated soil according to .

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