WO2018032805A1

WO2018032805A1 - Multi-stage purification treatment system for residual water from treatment of contaminated bottom sludge from river or lake

Info

Publication number: WO2018032805A1
Application number: PCT/CN2017/083570
Authority: WO
Inventors: 陶明; 翟德勤; 禹芝文; 陈士强; 田卫红; 赵明江
Original assignee: 中电建水环境治理技术有限公司
Priority date: 2016-08-16
Filing date: 2017-05-09
Publication date: 2018-02-22
Also published as: CN106219859A; CN106219859B

Abstract

Provided is a multi-stage purification treatment system for residual water from the treatment of contaminated bottom sludge from a river or lake, the system comprising a primary sedimentation tank (1) for naturally settling and removing particulate matters in the residual water, a secondary sedimentation tank (2) for retaining and removing the particulate matters in the residual water, and a tertiary magnetic filter purification device (3) for adsorbing and removing suspended matters in the residual water, these being sequentially connected in series with one another according to a residual water treatment path, wherein the primary sedimentation tank (1) comprises a first tank body(11); the secondary sedimentation tank (2) comprises a second tank body (21) and a device aiding sedimentation (22); and the tertiary magnetic filter purification device (3) comprises a chemical feeding coagulation device (31) and a magnetic filter device (32) connected with the chemical feeding coagulation device (31). Impurities in the residual water are filtered out and detoxified systematically and step by step, so that the concentration of pollutants in water in river channels can be decreased; and waste water with a higher turbidity can be treated by the system. In addition, the system has a high residual water treatment capacity and a high residual water treatment efficiency, and occupies a small area.

Description

Name of the invention: Multi-stage purification treatment system for residual water treatment of river and lake sediments

[0001] The invention belongs to the technical field of sewage treatment, and particularly relates to a multi-stage purification treatment system for residual water treatment of river and lake pollution.

Background technique

[0002] The river channel is a kind of open water area with narrow water surface and long process. In many places, the river channel has become a gathering place for various polluted water bodies. Due to years of sedimentation, polluted sediments are formed. Contaminated sediment is an intrinsic source of pollution that affects the quality of the water environment.

[0003] Environmental dredging is an important means of controlling heavy polluted water bodies. By dredging contaminated sediments, endogenous pollutants in polluted water bodies can be removed. The traditional dredging project can achieve high-efficiency mud-water separation by using natural sedimentation method because its dredged mud is mainly inorganic particles and has a high density. However, in recent years, as a large amount of organic pollutants are discharged into the water body, the content of organic clay in the fine clay in the dredged mud is continuously increased, which makes it difficult to achieve settlement under natural conditions. In the process of dredging, the sludge sediment is broken, and the release of pollutants is enhanced, so that the residual water contains a large amount of pollutants rich in the sediment. Most of these substances adhere to the fine particles and are suspended in the residual water. It is difficult to settle.

[0004] In order to solve the above technical problems, the currently widely used residual water treatment technology utilizes chemical flocculation to treat residual water. The chemical flocculant has the functions of compressing the electric double layer and adsorbing the bridge, so that the residual water can be gathered together to form flocculation and de-stabilization, and the purpose of purifying the residual water is achieved. The usual treatment method is that the residual water is initially set by the sedimentation tank, and the supernatant liquid is taken out and introduced into the remaining pool. Dredged bottom mud is a complex and stable dispersion system. Although the use of flocculant has a certain treatment effect, due to the prior art in the treatment of residual water, only the single equipment or components of the sedimentation tank are the main design body. Due to the limitation of the structure and function of the pool body, the amount of residual water treatment is small, and the rapid purification of residual water cannot be achieved, and the residual water purification effect is poor.

[0005] In addition, it should be noted that the products after the dredged sediment treatment mainly include residual water, residual sand, residual soil, etc., wherein the residual water treatment reaches the standard and returns to the river. In the industry, the discharge standard for residual water treatment stipulates that the treated residual water needs to meet the secondary emission standard stipulated in the Integrated Wastewater Discharge Standard (GB8978-1996).

technical problem [0006] The main object of the present invention is to provide a multi-stage purification treatment system for treating residual water in rivers and lakes, which aims to solve the problem that the conventional residual water treatment technology cannot achieve rapid purification of residual water and poor purification of residual water. problem.

Problem solution

Technical solution

[0007] The present invention is realized in this way, a multi-stage purification treatment system for treating residual water in rivers and lakes, including:

[0008] a primary sedimentation tank for removing natural particles from the residual water in series according to a residual water treatment path, a secondary sedimentation tank for intercepting particulate matter removed from the residual water, and a suspension for adsorbing and removing residual water Three-stage magnetic filter purification device;

[0009] wherein the primary sedimentation tank comprises a first pool body provided with a feed port, a slurry outlet and a water outlet; the secondary sedimentation tank comprises a second pool body and is disposed in the second pool body The auxiliary sinking device divides the second pool body into an upper clear water overflow area and a lower mud settling area, and the second pool body is provided with a water inlet connected to the water outlet, a fresh water outlet for discharging fresh water overflowing from the upper fresh water overflow region and a sludge discharge port for discharging sludge settled in the lower mud sedimentation zone; the three-stage magnetic filter purification device including a dosing connected to the water clearing port a coagulation device and a magnetic filter device coupled to the dosing coagulation device.

[0010] As a preferred technical solution of the present invention:

[0011] Further, the first cell body is provided with a decanter for flowing the supernatant liquid in the first cell body from the water outlet port to the second cell body.

[0012] Further, the auxiliary sink device is configured as a subsidence sloping plate and/or a sloping inclined tube.

[0013] Further, an end of the auxiliary sink device is provided with an overflow raft.

[0014] Further, the auxiliary sinking device is disposed in plurality, and the plurality of the assisting and sinking devices are sequentially arranged according to the residual water treatment path, and each of the two auxiliary lifting devices is separated by a partition wall; The upper part of the partition wall is provided with a clear water overflow port.

Further, the medicinal coagulation device includes a coagulation reactor and a dosing device connected to the coagulation reactor.

[0016] Further, the dosing device includes a PAM dosing device and a P respectively connected to the coagulation reactor AC dosing device.

[0017] Further, the first cell body is connected to the PAM dosing device; the second cell body is connected to the PAC dosing device.

[0018] Further, the sludge settled in the lower mud settling zone is discharged into the conditioning system through the mud pump.

[0019] Further, an online turbidimeter is disposed in the first cell body.

Advantageous effects of the invention

Beneficial effect

[0020] The present invention adopts a primary sedimentation tank, a secondary sedimentation tank and a three-stage magnetic filter purification device which are sequentially arranged in series, so that the residual water first passes through the natural settlement of the first pool body, and the coarse particulate matter is initially settled and discharged from the water outlet. The supernatant liquid enters the second pool body, further intercepts the fine particles in the residual water by the auxiliary sinking device, and the auxiliary sinking device divides the second pool body into the upper clear water overflow area and the lower mud sedimentation area, and the fine particles are trapped and then fall into In the lower mud sedimentation zone, the overflow water in the clear water overflow zone enters the three-stage magnetic filter purification device, and the fine suspension of the residual water is adsorbed and removed by the drug coagulation and the release and recovery of the magnetic powder in the magnetic filter device. The residual water treated by the first-stage sedimentation tank, the second-stage sedimentation tank and the three-stage magnetic filter purification device is directly discharged into the “returning river” after passing the test. In summary, the multi-stage purification of the residual water in the river and lake sediments of the present invention is purified. The treatment system, after passing through the first-stage sedimentation tank and the second-stage sedimentation tank, enters the three-stage magnetic filter device, and filters the residual water by stepwise and systematically, without The treatment reduces the concentration of pollutants in the river water body, and because the residual water circulates in the system consisting of the series first-stage sedimentation tank, the second-stage sedimentation tank and the three-stage magnetic filter purification device, the residual water stays in the system for a short time. Compared with the prior art, the sewage with higher turbidity can be treated, the amount of residual water treatment is large, and the residual water treatment efficiency is high, so that the same purification of residual water is achieved, so that the residual water purification effect is good, and the system covers an area. small.

Brief description of the drawing

DRAWINGS

1 is a schematic structural view of a multi-stage purification treatment system for treating residual water in rivers and lakes;

[0022] FIG. 2 is a schematic structural view of a first-stage sedimentation tank of a multi-stage purification treatment system for treating residual water in rivers and lakes;

[0023] FIG. 3 is a second embodiment of a multi-stage purification treatment system for residual water treatment of river and lake sediments provided by an embodiment of the present invention. Schematic diagram of the stage sedimentation tank;

4 is a schematic structural view of a three-stage magnetic filter purification device for a multi-stage purification treatment system for a river water rushing sediment sludge treatment residual water supply according to an embodiment of the present invention.

[0025] In the figure: 1-prime sedimentation tank, 11-first cell body, 111-slurry port, 112-slurry port, 113-outlet, 1 2-drinker, 13-line turbidimeter , 2-Secondary sedimentation tank, 21-Second tank body, 211-inlet, 212-drain, 213-clear, 214- upper clear water overflow, 215-low mud subsidence area, 22-assisted sink , 221 - first auxiliary inclined sloping plate, 222 - second auxiliary inclined inclined pipe, 223 - third auxiliary inclined inclined pipe, 23 - mud pump, 24-wall, 241 - overflow port, 25 - overflow weir , 3-level magnetic filter purification device, 31-dosing coagulation device, 311-coagulation reactor, 312-PAM dosing device, 313-PAC dosing device, 32-magnetic filter device.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] It is to be noted that when an element is referred to as being "fixed" or "in" another element, it can be directly on the other element or indirectly. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] The present invention provides a multi-stage purification treatment system for treating residual water in rivers and lakes, which is used for systemic and step-by-step impurity removal and harmless treatment of residual water to reduce pollutants in river water bodies. The concentration makes the treated residual water reach the discharge standard. At the same time, it can treat sewage with higher turbidity, large residual water treatment, high residual water treatment efficiency, quick purification of residual water, good residual water purification effect, and The area is small.

[0029] Referring to FIG. 1 to FIG. 4, the multi-stage purification treatment system for the residual water treatment of the river and lake sediments includes: a first-stage sedimentation tank for removing natural particles from the residual water in series according to the residual water treatment path. A secondary sedimentation tank 2 for trapping particulate matter in the residual water and a three-stage magnetic filter purification device 3 for adsorbing and removing the suspended matter in the residual water; wherein the primary sedimentation tank 1 includes a slurry inlet 111 The first pool body 11 of the slurry outlet 112 and the water outlet 113; the secondary sedimentation tank 2 includes a second pool body 21 and a subsidence device 22 disposed in the second pool body 21, and the auxiliary sink device 22 will be the second pool The body 21 is divided into an upper fresh water overflow area 214 and a lower mud settling area 215, and the second pool body 21 is provided with a water inlet 211 communicating with the water outlet 113 for discharging the upper clear water overflow. a fresh water outlet 213 overflowing the flow area 214 and a sludge discharge port 212 for discharging sludge settled in the lower mud settling area 215; the tertiary magnetic filter purification device 3 includes a dosing and coagulation device 31 communicating with the fresh water outlet 213 and The magnetic filter device 32 to which the dosing and coagulation device 31 is connected.

[0030] In the embodiment of the present invention, the first-stage sedimentation tank 1, the second-stage sedimentation tank 2, and the three-stage magnetic filter purification device 3 are sequentially arranged in series, so that the residual water first passes through the natural settlement of the first pool body 11, and the coarse particulate matter is initially settled. The supernatant discharged from the water outlet 113 is further introduced into the second cell body 21, and the fine particles in the residual water are further intercepted by the assisting device 22, and the auxiliary sinking device 22 divides the second cell body 21 into the upper fresh water overflow region 214. And the lower mud settling zone 215, the fine particles are intercepted and then fall into the lower mud settling zone 215, and the overflow water of the clean water overflow zone 214 enters the third-stage magnetic filter purifying device 3, through the dosing and coagulation and utilizing the magnetic filter device 32 The release and recovery of the magnetic powder to adsorb and remove the fine suspension in the residual water, and the residual water treated by the first-stage sedimentation tank 1 and the secondary sedimentation tank by the 2nd and 3rd-stage magnetic filter purification device 3 is directly tested. River "discharge, the multi-stage purification treatment system for the treatment of residual water in rivers and lakes of the present invention, after the first-stage sedimentation tank 1, the second-stage sedimentation tank 2, and then enter the three-stage magnetic filter device 3, step by step Systematicly filtering and resolving impurities in the residual water, reducing the concentration of pollutants in the river water, and the system can treat sewage with higher turbidity, and because the residual water stays in the system is short, The utility model has the advantages of large residual water treatment and high residual water treatment efficiency, thereby achieving the purpose of rapid purification of the residual water, and the same, the residual water purification effect is good, and the floor space is small.

Specifically, referring to FIG. 1 and FIG. 2, the first pool body 11 is provided with a decanter for draining the supernatant liquid in the first pool body 11 from the water outlet 113 into the second pool body 21. 12. The supernatant in the first cell body 11 is more conveniently drained into the second cell body 21 by the decanter 12 provided. The value indicates that the decanter 12 can employ the conventional techniques of the prior art. The decanter 12 is disposed at the water outlet 113. Further, an in-line turbidimeter 13 is disposed in the first cell body 11, and specifically, the in-line turbidimeter 13 is located on the first cell body 11 on one side of the slurry inlet port 111. The turbidity of the residual water in the first cell body 11 can be measured by setting the online turbidimeter 13.

[0032] Further, referring to FIG. 1 and FIG. 3, the auxiliary sink device 22 is configured as a subsidence sloping plate and/or a sinker tube. An overflow raft 25 is provided at the end of the assisting device 22. The overflow weir plate 25 helps to maintain an even overflow of the overflow water of the upper fresh water overflow area 214. Specifically, the auxiliary lifting device 22 may be disposed in plurality, and the plurality of auxiliary lifting devices 22 are sequentially arranged according to the residual water treatment path, and each of the two auxiliary lifting devices 22 is separated by the partition wall 24; A clear water overflow port 241 is provided at the upper portion. Specifically, a diversion tank is disposed at the fresh water overflow port 241 of the partition wall 24, and the diverting trough is located between the overflow weir plate 25 and the partition wall 24, so as to facilitate the overflow and sinking of the clean water step by step. Drop. In addition, the overflow water of the upper fresh water overflow zone 214 can be pumped into the coagulation reactor 311 by a clean water pump. Preferably, the assisting and sinking device 22 includes a first auxiliary sloping plate 221, a second auxiliary slanting tube 222, and a third auxiliary slanting tube 223 which are sequentially spaced according to the residual water treatment path. The supernatant entering the second cell body 21 further intercepts the fine particles in the residual water through the auxiliary sinking device. Specifically, the supernatant liquid passes through the first auxiliary sloping plate 21, and the first auxiliary sloping plate 221 will be compared. After the coarse particles are trapped, the fine particles are again trapped by the interception of the second auxiliary inclined tube 222 and the third auxiliary inclined tube 223, passing through the first auxiliary inclined plate 221 in the second pool body 21, The second auxiliary inclined tube 222 and the third auxiliary inclined inclined tube 223 are stepped and overflowed to further remove fine particles in the residual water.

[0033] Preferably, the sludge settled in the lower mud settling zone 215 is discharged into the conditioning system through the mud pump 23. It is worth noting that the slurry that has been initially concentrated in the prior art is also transported to the conditioning system by a small cutter suction boat. The purpose of the prior art conditioning system is to condition the mud slurry for conditioning treatment. Therefore, in the present invention, the sludge settled in the lower mud settling area 215 is discharged into the conditioning system, and the mud of the second pool body 21 is prevented from being separately treated, discharged into the conditioning system, and then directly subjected to subsequent treatment, thereby further improving the fouling. Mud treatment efficiency. Further, in the present embodiment, the slurry settled in the lower mud settling zone 215 can also be discharged into the first cell body 11 through the slurry pump 23. By directly pumping the slurry in the second cell body 21 into the first cell body 11, and then passing through the slurry outlet 112 of the first cell body 11 and discharging it, it is also possible to avoid the separate treatment of the slurry of the second cell body 21. At the same time, the efficiency of sludge removal is improved.

[0034] Further, referring to FIG. 1 and FIG. 4, the dosing and coagulation device 31 includes a coagulation reactor 311 and a dosing device connected to the coagulation reactor 311. The dosing device includes a PAM dosing device 312 and a PAC dosing device 313 which are respectively connected to the coagulation reactor 311. It is worth noting that the coagulation reactor 311, the PAM dosing device 312, and the PAC dosing device 313 can employ conventional conventional techniques. The PAM dosing device 312 can add PAM to the coagulation reactor 311 by providing a metering pump. PAM (polyacrylamide) is an organic polymer assisting solution 1J which has a larger floc formed between the particles. It produces a huge surface adsorption effect. It is the most widely used flocculant for organic polymers in water treatment. In addition, PAM has good turbidity and chromaticity in its water treatment by its adsorption and bridging functions. Removal capacity. The PAC dosing device 313 can add PAC to the coagulation reactor 311 by providing a metering pump, which is also commonly referred to as a water purifying agent or a coagulant, which is a water-soluble inorganic high molecular polymer. , mainly through the action of compressing electric double layer, adsorption electric neutralization, adsorption bridging, sediment net trapping, etc., to make fine suspended particles and colloids in water The particles are destabilized, aggregated, flocculated, coagulated, and precipitated to achieve the effect of purification treatment. The added PAM and PAC are mixed in the coagulation reactor 311. Specifically, the coagulation reactor 311 is provided with a stirring device, and the added PAM and PAC are mixed with the overflow water by a stirring device. Further, considering that the residual water in the first cell body 11 and the second cell body 21 is also well flocculated and purified step by step, the first cell body 11 is connected to the PA M dosing device 312; 21 is connected to the PAC dosing device 313. In addition, the first cell body 11 and the second cell body 21 may also be connected to the PAC dosing device 313.

[0035] It is worth noting that the treated residual water can meet the secondary emission standards specified in the Integrated Wastewater Discharge Standard (GB8978-1996). Specifically, the suspended matter content value (ie, the SS value) of the recirculating residual water obtained by the residual water multi-stage purification device is less than 15 mg/l, and the COD, BOD, strontium, and barium contents are higher than that of the original river and lake. The concentration of pollutant-containing indicators is reduced by more than 60%, and the recirculated residual water can be discharged back into rivers and lakes, which can effectively dilute and reduce the concentration of polluted water bodies in the original rivers and lakes.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention are included in the present invention. Within the scope of protection.

Claims

Claim

The utility model relates to a multi-stage purification treatment system for treating residual water in rivers and lakes, which is characterized in that it comprises:

a primary sedimentation tank for removing natural particles from the residual water in series according to the residual water treatment path, a secondary sedimentation tank for intercepting particulate matter removed from the residual water, and a third stage for adsorbing and removing the suspended matter in the residual water Magnetic filter purification device;

Wherein, the primary sedimentation tank comprises a first pool body provided with a slurry inlet, a slurry outlet and a water outlet; the secondary sedimentation tank comprises a second pool body and a subsidence sink placed in the second pool body The auxiliary sinking device divides the second pool body into an upper clear water overflow area and a lower mud settling area, and the second pool body is provided with a water inlet connected to the water outlet for discharging the a fresh water outlet overflowing the upper fresh water overflow area and a sludge discharge port for discharging sludge settled in the lower mud settling zone; the three-stage magnetic filter purification device includes a medicine mixing and coagulation device connected to the water clearing port And a magnetic filter device coupled to the dosing coagulation device.

The multi-stage purification treatment system for river water rushing sediment sludge treatment residual water according to claim 1, wherein the first pool body is provided with the supernatant liquid from the first pool body The nozzle is drained to a decanter in the second cell.

The multi-stage purification treatment system for river water rushing sediment treatment residual water according to claim 1, wherein the auxiliary subsidence device is provided as a sloping plate and/or a sloping tube.

The multi-stage purification treatment system for river water rushing sediment sludge treatment residual water according to claim 3, wherein the auxiliary subsidence device is provided with an overflow raft at the end.

The multi-stage purification treatment system for a river and lake flu-contaminated sludge treatment residual water according to claim 1, wherein the auxiliary subsidence device is provided in plurality, and the plurality of the auxiliary-sinking devices are sequentially arranged according to a residual water treatment path. Arranged at intervals, each of the two auxiliary sinking devices is separated by a partition wall; an upper portion of the partition wall is provided with an overflow port.

The multi-stage purification treatment system for river water rushing sediment sludge treatment residual water according to any one of claims 1 to 5, wherein the medicinal coagulating device comprises a coagulation reactor and the coagulation reaction The dosing device connected to the device.

a multi-stage purification treatment system for residual water treatment of river and lake sediments according to claim 6, The dosing device includes a PAM dosing device and a PAC dosing device respectively connected to the coagulation reactor.

[Claim 8] The multi-stage purification treatment system for river and river flu pollution sludge treatment residual water according to claim 7, wherein the first pool body is connected to the PAM dosing device; The cell body is connected to the PAC dosing device.

[Claim 9] The multi-stage purification treatment system for river water rushing sediment sludge treatment residual water according to any one of claims 1 to 5, wherein the sludge settled in the lower mud sedimentation zone is discharged through the mud pump Into the conditioning system.

[Claim 10] The multi-stage purification processing system for river water rushing sediment treatment residual water according to any one of claims 1 to 5, wherein an online turbidimeter is provided in the first cell.