CN212559837U

CN212559837U - Cofferdam construction wastewater treatment system

Info

Publication number: CN212559837U
Application number: CN202021090844.7U
Authority: CN
Inventors: 唐宇
Original assignee: Chengdu Huanneng Demei Environmental Protection Equipment Manufacturing Co ltd
Current assignee: Chengdu Huanneng Demei Environmental Protection Equipment Manufacturing Co ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2021-02-19
Anticipated expiration: 2030-06-12

Abstract

The utility model discloses a cofferdam construction effluent disposal system, including magnetic medium coagulation reactor and magnetism ware of receiving back, still including separating thick pond and high-efficient preliminary sedimentation tank, should separate thick pond and dispose with this lift-pit that separates thick pond intercommunication and be arranged in the stealthily dirty pump of this lift-pit, this stealthily dirty pump water to this high-efficient preliminary sedimentation tank, and dispose the pipe-line mixer between this stealthily dirty pump and this high-efficient preliminary sedimentation tank, this pipe-line mixer is connected with coagulant aid charge device. The utility model is suitable for a processing of cofferdam construction waste water that the water yield is big, the fluctuation of water quality of water is big can improve wastewater treatment system's the ability of shock load that shocks resistance, under the undulant great operating mode of waste water yield, quality of water, also can effective treatment to cofferdam waste water.

Description

Cofferdam construction wastewater treatment system

Technical Field

The utility model relates to a waste water treatment technical field particularly, relates to a cofferdam construction effluent disposal system.

Background

The water resource is abundant in China, the development purpose of the hydropower station is mainly power generation, and the hydropower station has the functions and effects of storing water and energy, sharing flood control tasks in rivers, improving riverway channels and achieving remarkable economic benefits. In the construction process of the hydropower station, the construction wastewater in the cofferdam area has larger water quantity and larger water fluctuation, the concentration of suspended matters is as high as about 15000mg/L, the cofferdam area mainly comprises inorganic matters such as rock powder, silt, cement particles and the like, and the fluctuation of the water quality of the wastewater is larger due to the periodicity of project construction.

The prior published Chinese utility model patent with the patent name of 'a high-efficient wastewater sedimentation system with magnetic medium', publication number CN210419614U, the patent sets up the fast mixed region, the magnetism mixed region, the flocculation region and the settling zone, adopts the magnetic medium coagulating sedimentation separation process, improves the efficiency of flocculation and settlement in wastewater treatment, and realizes the recovery of magnetic powder and the cyclic utilization of magnetic powder through the magnetic powder recovery separator.

However, the above patent is not suitable for treating cofferdam construction wastewater, more inorganic matters in the cofferdam wastewater influence the effect of magnetic medium coagulating sedimentation separation, and the above patent is not suitable for working conditions with large water quantity and water quality fluctuation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a cofferdam construction effluent disposal system, it designs to cofferdam construction effluent disposal system to be applicable to the processing of the big, undulant big cofferdam construction waste water of water yield quality of water, can improve effluent disposal system's the ability of shock load that shocks resistance, under the great operating mode of waste water yield, quality of water fluctuation, also can effective processing to cofferdam waste water.

The embodiment of the utility model discloses a realize through following technical scheme:

the utility model provides a cofferdam construction effluent disposal system, includes magnetic medium coagulation reactor and magnetism ware of retrieving, still includes coarse pond and high-efficient preliminary sedimentation tank, should separate coarse pond configuration with should separate the lift-pit of coarse pond intercommunication with be located the stealthily dirty pump of this lift-pit, this stealthily dirty pump water to this high-efficient preliminary sedimentation tank, and dispose the line mixer between this stealthily dirty pump and this high-efficient preliminary sedimentation tank, this line mixer is connected with coagulant aid charge device.

In the embodiment of the utility model, magnetism ware of retrieving is configured with the intercommunication the mud pipeline of lift-well, and this mud pipeline configuration has the sludge pump.

The embodiment of the utility model provides an in, still include the quenching and tempering jar, this quenching and tempering jar with high-efficient preliminary sedimentation tank intercommunication, and this quenching and tempering jar with dispose the sludge pump between the high-efficient preliminary sedimentation tank.

In the embodiment of the utility model, the device also comprises a conditioning tank which is communicated with the high-efficiency pre-settling tank, and a sludge pump is arranged between the conditioning tank and the high-efficiency pre-settling tank; the sludge pipeline is provided with a three-way valve, one port of the three-way valve is communicated with the lifting well, and the other port of the three-way valve is communicated with the hardening and tempering tank.

The embodiment of the utility model provides an in, still include the hydroextractor that is used for sludge dewatering after the quenching and tempering.

In the embodiment of the present invention, the dewatering device further comprises a dewatering filtrate pump, the dewatering filtrate pump is disposed at the dewatering device liquid outlet, and the dewatering filtrate pump is communicated with the coarse separation tank.

In the embodiment of the utility model, thick pond water inlet is separated and is configured with coagulant aid and add the mouth.

The utility model discloses technical scheme has following advantage and beneficial effect at least:

the embodiment of the utility model provides an originally increase the preliminary sedimentation treatment before magnetic medium coagulating separation sedimentation treatment, this preliminary sedimentation treatment includes coarse screening pond and high-efficient preliminary sedimentation pond, realizes filtration and the natural sedimentation of waste water through coarse screening pond, accomplishes the primary sedimentation to inorganic matters such as silt in the waste water; and adding a PAM (polyacrylamide) agent and pre-precipitating a large amount of silt in the high-efficiency pre-precipitation tank to realize secondary precipitation of inorganic substances such as silt in the wastewater, and through twice silt precipitation, the direct influence on a magnetic medium coagulating separation and precipitation treatment process when the water quality fluctuation of the cofferdam construction wastewater is large can be avoided, so that the magnetic medium coagulating reactor and the magnetic medium precipitation tank can be suitable for treating cofferdam wastewater containing more inorganic substances, the impact load resistance of the whole treatment process is improved, and under the working condition that the water quality fluctuation of the wastewater is large, the wastewater treatment process can also effectively treat the cofferdam wastewater.

In addition, the technical proposal adds the coarse separation tank and the high-efficiency pre-settling tank before the magnetic medium coagulation separation and sedimentation treatment, adds the grid in the coarse separation tank, the grid has the effect of primary buffering to the wastewater inflow, the coarse separation tank also has the function of a storage tank and has the effect of secondary buffering to the wastewater inflow, and the high-efficiency pre-settling tank has the effect of tertiary buffering to the wastewater inflow, and effectively buffers the fluctuation of the wastewater inflow of the cofferdam by utilizing a tertiary buffering method or reduces the impact of the larger inflow of the wastewater of the cofferdam on the magnetic medium coagulation separation and sedimentation treatment, thereby avoiding the direct influence on the magnetic medium coagulation separation and sedimentation treatment process when the fluctuation of the wastewater of the cofferdam construction is larger, leading the magnetic medium coagulation reactor and the magnetic medium sedimentation tank to be suitable for treating the cofferdam wastewater with large water quantity or large water quantity fluctuation, and improving the impact load resistance of the whole treatment process, under the working condition that the fluctuation of the water quantity of the wastewater is large, the wastewater treatment process can also effectively treat the cofferdam wastewater.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a diagram showing a preliminary sedimentation treatment in a cofferdam construction wastewater treatment system according to the present invention;

FIG. 2 is a structural diagram of magnetic medium coagulation separation sedimentation in the cofferdam construction wastewater treatment system of the present invention;

FIG. 3 is a structural view of a cofferdam construction wastewater treatment system of the present invention.

Icon:

1-coarse screening tank, 2-lift well, 3-submersible sewage pump, 4-pipeline mixer, 5-high efficiency pre-settling tank, 6-magnetic medium coagulation reactor, 7-PAC pharmaceutical device, 8-PAC dosing metering pump, 9-PAM pharmaceutical device A, 10-PAM dosing metering pump A, 11-magnetic medium settling tank, 12-sludge reflux pump, 13-residual sludge pump, 14-deflocculating machine, 15-magnetic recovery device, 16-sludge pump, 17-conditioning tank, 18-dehydrator, 19-PAM pharmaceutical device B and 20-PAM dosing metering pump B.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the directions or positional relationships indicated by the terms "inside" and "outside" are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific direction, be constructed and operated in a specific direction, and therefore, should not be interpreted as a limitation of the present invention.

In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "configured," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 3, a cofferdam construction wastewater treatment system includes a magnetic medium coagulation separation and sedimentation treatment for wastewater, a coagulant aid is added into the wastewater before the magnetic medium coagulation separation and sedimentation, and the wastewater is subjected to a pre-sedimentation treatment.

In order to be suitable for treating cofferdam construction wastewater with large water volume and large water quantity and water quality fluctuation, the technical scheme is that the wastewater is subjected to pre-precipitation treatment, the pre-precipitation comprises the steps of introducing the wastewater into a coarse-screening tank 1 provided with a grid, precipitating large particles in the wastewater in the coarse-screening tank 1, arranging a lifting well 2 communicated with the coarse-screening tank 1 at the tail end of the coarse-screening tank 1, and pumping the wastewater in the lifting well 2 to a high-efficiency pre-precipitation tank 5 by using a submersible sewage pump 3; a pipeline mixer 4 is arranged between the submersible sewage pump 3 and the high-efficiency pre-settling tank 5, and the coagulant aid is added into the wastewater through the pipeline mixer 4. The tail end of the coarse separation tank 1 is provided with the lifting well 2, so that the effect of adjusting the inflow rate can be achieved. Then carrying out magnetic medium coagulation separation and precipitation treatment on the wastewater subjected to the pre-precipitation treatment, wherein the magnetic medium coagulation separation and precipitation comprises introducing the wastewater subjected to the pre-precipitation treatment into a magnetic medium coagulation reactor 6, and sequentially adding a flocculating agent, magnetic powder and a coagulant aid into the magnetic medium coagulation reactor 6; the wastewater in the magnetic medium coagulation reactor 6 automatically flows into a magnetic medium sedimentation tank 11 for sedimentation, supernatant in the magnetic medium sedimentation tank 11 overflows and is discharged, a flocculating agent can be PAC or PFS and the like, a coagulant aid can be PAM, when in use, PAC is configured as a medicament with the concentration of 10%, and PAM is configured as a medicament with the concentration of 0.1%.

It is to be noted that PAM is polyacrylamide, PAC is polyaluminum chloride, and PFS is polyferric sulfate.

The working process of the method is that the wastewater firstly enters the coarse screening tank 1, the grid in the coarse screening tank 1 is utilized to filter the blocking solid impurities in the wastewater, and precipitate the large particles of the wastewater, and the coarse screening tank 1 can be used as a storage tank, when the fluctuation of the water inflow is large, the water inflow can be buffered, and the influence of the severe fluctuation of the water amount on the treatment effect of the wastewater is avoided. A lifting well 2 is arranged at the water outlet end of the coarse screening tank 1, a submersible sewage pump 3 is arranged in the lifting well 2, wastewater in the coarse screening tank 1 is pumped into a high-efficiency pre-settling tank 5 by the submersible sewage pump 3, a pipeline mixer 4 is arranged between the submersible sewage pump 3 and the high-efficiency pre-settling tank 5, and PAM is added into the wastewater through the pipeline mixer 4 for tempering to assist in settling; the wastewater is pre-precipitated in the high-efficiency pre-precipitation tank 5 to form a large amount of silt, then automatically flows into the magnetic medium coagulation reactor 6, the magnetic medium coagulation reactor 6 is divided into 3 grades, the PAC medicament prepared by the PAC pharmaceutical device 7 is added to the PAC medicament in the first grade through the PAC dosing metering pump 8, the magnetic powder is added to the second grade, the PAM medicament prepared by the PAM pharmaceutical device is added to the third grade through the PAM dosing metering pump A10, the wastewater in the magnetic medium coagulation reactor 6 generates micro magnetic floccules which are a combination of pollutants, medicaments and magnetic powder, then the wastewater in the magnetic medium coagulation reactor 6 automatically flows into the magnetic medium precipitation tank 11, the micro magnetic floccules are greatly increased in specific gravity due to containing the magnetic powder and quickly precipitate into the bottom of the magnetic medium precipitation tank 11, and the treated water reaching the standard enters the effluent weir to be subjected to overflow discharge reaching the standard after passing through the. A central transmission mud scraper is arranged in the magnetic medium sedimentation tank 11 and pushes the magnetic mud mixture into a mud bucket in the center; one part is circularly pumped into the magnetic medium coagulation reactor 6 through the sludge reflux pump 12 to adjust the sludge concentration and repeatedly use the medicament in the sludge; the other part is lifted by a residual sludge pump 13 to enter a floc removing machine 14, the micro magnetic flocs are dispersed and crushed at high speed and enter a magnetic recovery device 15 to separate magnetic powder from sludge, and the magnetic powder falls into the magnetic medium coagulation reactor 6 for reuse.

Compared with the prior art, the technical scheme is that the coarse screening tank 1 and the high-efficiency pre-settling tank 5 are added before the magnetic medium coagulation separation and sedimentation treatment, so that the filtering and natural sedimentation of the wastewater can be realized through the coarse screening tank 1, and the primary sedimentation of inorganic substances such as silt in the wastewater is completed; and a PAM medicament is added and a large amount of silt is pre-precipitated in the high-efficiency pre-precipitation tank 5, so that secondary precipitation of inorganic substances such as silt in the wastewater is realized, and through twice silt precipitation, direct influence on a magnetic medium coagulation separation precipitation treatment process when the water quality fluctuation of the cofferdam construction wastewater is large can be avoided, so that the magnetic medium coagulation reactor 6 and the magnetic medium precipitation tank 11 can be suitable for treating cofferdam wastewater containing more inorganic substances, the shock load resistance of the whole treatment process is improved, and under the working condition that the water quality fluctuation of the wastewater is large, the wastewater treatment process can also effectively treat the cofferdam wastewater.

Compared with the prior art, the technical scheme is that the coarse-screening tank 1 and the high-efficiency pre-settling tank 5 are added before the magnetic medium coagulation separation and sedimentation treatment, the grid is added in the coarse-screening tank 1, the grid has a primary buffering effect on wastewater inflow, the coarse-screening tank 1 also has a storage tank function, and has a secondary buffering effect on wastewater inflow, the high-efficiency pre-settling tank 5 has a tertiary buffering effect on wastewater inflow, the fluctuation of cofferdam wastewater inflow is effectively buffered by using a tertiary buffering method, or the impact of the larger inflow of cofferdam wastewater on the magnetic medium coagulation separation and sedimentation treatment is reduced, the direct influence on the magnetic medium coagulation separation and sedimentation treatment process when the cofferdam construction wastewater amount fluctuation is larger can be avoided, so that the magnetic medium coagulation reactor 6 and the magnetic medium sedimentation tank 11 can be suitable for treating cofferdam wastewater with large water volume or large water volume fluctuation, and the impact resistance load capacity of the whole treatment process is improved, under the working condition that the fluctuation of the water quantity of the wastewater is large, the wastewater treatment process can also effectively treat the cofferdam wastewater.

In certain embodiments, the slurry produced by the magnetic medium coagulation separation precipitation is recycled to the pre-precipitation for utilization. Because the cofferdam construction periodicity, the cofferdam waste water quality fluctuation is great, when the concentration of suspended matters in the cofferdam waste water is lower, the sludge generated by the magnetic recovery device 15 flows back to the coarse separation tank 1, the purpose of recycling the medicament in the sludge is achieved, the total dosage of the medicament is reduced, the purpose of increasing the suspended concentration in the cofferdam waste water is achieved, the floc effect in the waste water is improved, the floc volume is increased, and the floc settling rate is favorably improved.

It should be noted that, because of the periodicity of cofferdam construction, the fluctuation of the cofferdam wastewater quality is large, that is, the concentration of suspended matters in the cofferdam wastewater may be high or low, a sludge pipeline communicated with the lift shaft 2 is configured in the magnetic recovery device 15, and a sludge pump is configured in the sludge pipeline, a three-way valve is configured in the sludge pipeline, one port of the three-way valve is communicated with the lift shaft 2, the other port of the three-way valve is communicated with the tempering tank 17, and the three-way valve is communicated with the pipeline of the coarse separation tank 1, and the pipeline of the three-way valve communicated with the tempering tank 17 is respectively provided with a control valve. When the concentration of suspended matters in the cofferdam wastewater is high, the concentration of suspended matters does not need to be improved, the control valve from the three-way valve to the lifting well 2 is closed, the control valve from the three-way valve to the tempering tank 17 is opened, and the sludge generated by the magnetic recovery device 15 directly flows into the tempering tank 17 for tempering treatment; when the concentration of suspended matters in the cofferdam wastewater is lower, the control valve from the three-way valve to the lifting well 2 is opened, and the control valve from the three-way valve to the tempering tank 17 is closed, so that the sludge generated by the magnetic recovery device 15 directly flows into the lifting well 2. When the device is used, the sludge generated by the magnetic reclaimer 15 firstly flows back to the tempering tank 17, and only when the concentration of suspended matters in the cofferdam wastewater is low, the sludge flows back to the lifting well 2.

In some embodiments, the slurry produced by the pre-precipitation is subjected to conditioning, the conditioned slurry is then subjected to dewatering, and the filtrate produced by dewatering is recycled to the pre-precipitation for use. The conditioning comprises passing the slurry into a conditioning tank 17 and adding a coagulant aid to the conditioning tank 17. The dewatering includes dewatering the conditioned slurry with a dewatering machine 18. When suspension concentration is lower in the cofferdam waste water, the mud that ware 15 produced is retrieved to magnetism directly flows into lift-up well 2, at this moment, in order to effectively handle the mud in the high-efficient preliminary sedimentation tank 5, this technical scheme sets up sludge pump 16 and quenching and tempering jar 17, utilize sludge pump 16 to send the mud pump 16 of high-efficient preliminary sedimentation tank 5 bottom to quenching and tempering jar 17, and add the PAM medicament that PAM pharmacy device B19 configured through PAM dosing pump B20, PAM medicament concentration that this quenching and tempering used is 0.1 ~ 0.2%, carry out the quenching and tempering of mud in quenching and tempering jar 17, in order to improve the sludge dewatering rate. And (3) the conditioned sludge enters a dehydrator 18 to be dewatered and then transported outside, the filtrate flows back to the coarse screening tank 1, and the filtrate flows back to the coarse screening tank 1, so that the purpose of recycling the medicinal agent in the filtrate can be achieved, and the total dosage of the medicinal agent is reduced. In addition, because the inorganic matter is more in the cofferdam waste water, the flocculation and precipitation in high-efficient preliminary sedimentation pond 5 only plays the purpose of deposiing the pollutant in the waste water, for the convenience of dehydration, improves the dehydration rate, before the sludge dewatering, carries out quenching and tempering to mud.

In some embodiments, the slurry generated by the magnetic medium coagulation separation and precipitation is mixed with the slurry generated by the pre-precipitation, then the slurry is subjected to conditioning treatment, then the slurry subjected to conditioning treatment is subjected to dehydration treatment, and the filtrate generated by dehydration is recycled to the pre-precipitation for utilization. The conditioning comprises passing the slurry into a conditioning tank 17 and adding a coagulant aid to the conditioning tank 17. The dewatering includes dewatering the conditioned slurry with a dewatering machine 18. When the concentration of suspended matters in the cofferdam wastewater is higher, the sludge generated by the magnetic recycling device 15 directly flows into the conditioning tank 17, at the moment, in order to effectively process the sludge in the magnetic recycling device 15 and the high-efficiency pre-settling tank 5, the technical scheme is provided with the sludge pump 16 and the conditioning tank 17, the sludge pump 16 at the bottom of the high-efficiency pre-settling tank 5 is sent to the conditioning tank 17 by utilizing the sludge pump 16, the sludge generated by the magnetic recycling device 15 directly flows into the conditioning tank 17, a PAM medicament prepared by a PAM pharmaceutical device B19 is added through a PAM medicament adding metering pump B20, the concentration of the PAM medicament for conditioning is 0.1-0.2%, the conditioning of the sludge is carried out in the conditioning tank 17, and the sludge dewatering rate is improved. And (3) the conditioned sludge enters a dehydrator 18 to be dewatered and then transported outside, the filtrate flows back to the coarse screening tank 1, and the filtrate flows back to the coarse screening tank 1, so that the purpose of recycling the medicinal agent in the filtrate can be achieved, and the total dosage of the medicinal agent is reduced.

The utility model provides a cofferdam construction effluent disposal system, includes magnetic medium coagulation reactor 6 and magnetism ware 15 of retrieving, still includes and separates thick pond 1 and high-efficient preliminary sedimentation tank 5, should separate thick pond 1 dispose with should separate the lift-well 2 of thick pond 1 intercommunication and be located the stealthily dirty pump 3 in this lift-well 2, this stealthily dirty pump 3 pump water to this high-efficient preliminary sedimentation tank 5, and dispose pipeline mixer 4 between this stealthily dirty pump 3 and this high-efficient preliminary sedimentation tank 5, this pipeline mixer 4 is connected with coagulant aid device. The coagulant aid dosing device comprises a PAM pharmaceutical device B19 and a PAM dosing pump B20.

In some embodiments, the system further comprises a tempering tank 17, the tempering tank 17 is communicated with the high-efficiency pre-sedimentation tank 5, and a sludge pump 16 is arranged between the tempering tank 17 and the high-efficiency pre-sedimentation tank 5. And a dewatering machine 18 for dewatering the conditioned sludge. The device also comprises a dewatering filtrate pump which is arranged at the liquid outlet of the dewatering machine 18 and is communicated with the coarse-screening tank 1.

In some embodiments, the system further comprises a tempering tank 17, wherein the tempering tank 17 is communicated with the high-efficiency pre-settling tank 5, and a sludge pump 16 is arranged between the tempering tank 17 and the high-efficiency pre-settling tank 5; the sludge pipeline is provided with a three-way valve, one port of the three-way valve is communicated with the coarse screening tank 1, and the other port of the three-way valve is communicated with the tempering tank 17. And a dewatering machine 18 for dewatering the conditioned sludge. The device also comprises a dewatering filtrate pump which is arranged at the liquid outlet of the dewatering machine 18 and is communicated with the coarse-screening tank 1.

In certain embodiments, the water inlet of the coarse separation tank 1 is provided with a coagulant aid adding port. Due to the periodicity of project construction and the large fluctuation of the inlet water quality of cofferdam wastewater, coagulant aid adding ports are arranged between the water inlets of the coarse separation tanks 1, and PAM (polyacrylamide) agents with the concentration of 0.1% are added into the wastewater inlet through the coagulant aid adding ports so as to strengthen the pre-precipitation treatment of the cofferdam wastewater.

The working process of the cofferdam construction wastewater treatment system is as follows: according to the water flow direction, the coarse separation tank 1 is used for separating large-particle sediments at the front end and is used as a storage tank at the same time, is lifted by a submersible sewage pump 3 in a lifting pump well and enters a high-efficiency pre-settling tank 5 through a pipeline mixer 4; wherein, the pipeline mixer 4 is added with PAM medicament for quenching and tempering auxiliary precipitation; sewage automatically flows into a magnetic medium coagulation reactor 6 after being subjected to a great amount of pre-precipitation of silt, and is divided into 3 grades, wherein the PAC medicament with the concentration of 10% and prepared by a PAC pharmaceutical device 7 is added into the first grade through a PAC dosing metering pump 8, the supplementary magnetic powder and the magnetic powder recovered by a magnetic recovery device 15 are added into the second grade, the PAM medicament with the concentration of 0.1% and prepared by a PAM pharmaceutical device A9 is added into the third grade through a PAM dosing metering pump A10, so that wastewater in the magnetic medium coagulation reactor 6 generates micro magnetic floccules, the micro magnetic floccules are a combination of pollutants, medicaments and magnetic powder and automatically flow into a magnetic medium sedimentation tank 11, the micro magnetic floccules contain the magnetic powder, the specific gravity is greatly increased, the micro magnetic floccules quickly sink into the bottom of the tank, and treated water reaching the standard enters an effluent overflow weir and is discharged;

a central transmission mud scraper is arranged in the magnetic medium sedimentation tank 11 and pushes the magnetic mud mixture into a mud bucket in the center; one part is circularly pumped into the magnetic medium coagulation reactor 6 through the sludge reflux pump 12 to adjust the sludge concentration and repeatedly use the medicament; the other part is lifted by a residual sludge pump 13 to enter a floc breaker 14-14, the micro magnetic flocs are dispersed and crushed at high speed and enter a magnetic recovery device 15 to separate magnetic powder from sludge, the separated magnetic powder falls into a magnetic medium coagulation reactor 6 for reuse, and the separated sludge part flows back to the lifting well 2. When the suspension concentration of the inlet water of the coarse separation tank 1 is high, part of sludge separated by the magnetic recovery device 15 enters the conditioning tank 17, sludge at the bottom of the high-efficiency pre-settling tank 5 also enters the conditioning tank 17 through the sludge pump 16, and a PAM medicament with the concentration of 0.1-0.2% and prepared by a PAM pharmaceutical device B19 is added through a PAM dosing pump B20; the sludge after the conditioning enters a dehydrator 18 for sludge dehydration and then is transported outside, and the filtrate flows back to a coarse screening tank 1. When the suspension concentration of the inlet water of the coarse separation tank 1 is low, part of sludge separated by the magnetic recovery device 15 flows back to the coarse separation tank 1, sludge at the bottom of the high-efficiency pre-settling tank 5 enters a tempering tank 17 through a sludge pump 16, and a PAM medicament with the concentration of 0.1-0.2% and prepared by a PAM pharmaceutical device B19 is added through a PAM dosing pump B20; the sludge after the conditioning enters a dehydrator 18 for sludge dehydration and then is transported outside, and the filtrate flows back to a coarse screening tank 1.

It should be noted that the water pipes between the high-efficiency pre-settling tank 5 and the magnetic medium coagulation reactor 6 and between the magnetic medium coagulation reactor 6 and the magnetic medium settling tank 11 are rectangular pipes, and the gradient requirement is greater than 0.5%, so that the micro-magnetic flocs are prevented from being deposited.

It should be noted that the front ends of the high-efficiency pre-settling tank 5 and the magnetic medium settling tank 11 are both provided with a water distribution area, and the mud scrapers are both in a central transmission type; all set up the swash plate in the pond, swash plate installation angle 60.

The control system of the cofferdam construction wastewater treatment system comprises time relay delay and PLC linkage control.

This cofferdam construction effluent disposal system except being applicable to the processing of the big cofferdam construction waste water of water yield, the undulant big of water yield quality of water, following beneficial effect has in addition: the magnetic medium is adopted to load the sediment, so that the hydraulic load of the sedimentation tank is high, and the treatment effect is fast; the equipment occupies small area, the treated water amount is large, the power consumption per ton of treated water is low, and the effluent quality is stable; the anti-impact load is strong, the division of labor of each tank body is clear, and even if the water quantity and the water quality fluctuate to a certain extent, the sewage treatment can be still effectively carried out; the used magnetic medium is recycled, so that the loss amount is small; by adding PAC, the effect of removing algae in the river water is achieved; the concentration range of the sewage suspension can be treated is high; the concentration of the coagulation and sedimentation tank is controlled by adjusting the sludge reflux pump 12 and the excess sludge pump 13, so that the optimal coagulation and sedimentation effects can be effectively achieved; the agent is recycled by the sludge backflow, and the use amount of the agent is greatly reduced.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a cofferdam construction effluent disposal system, includes magnetic medium coagulation reactor and magnetism ware of retrieving, its characterized in that still includes coarse pond and high-efficient preliminary sedimentation tank, should separate coarse pond and dispose with this lift-pit well that separates coarse pond intercommunication and the stealthily dirty pump that is arranged in this lift-pit, this stealthily dirty pump water is to this high-efficient preliminary sedimentation tank, and dispose the tube-line mixer between this stealthily dirty pump and this high-efficient preliminary sedimentation tank, and this tube-line mixer is connected with coagulant aid charge device.

2. The cofferdam construction wastewater treatment system of claim 1, wherein the magnetic reclaimer is provided with a sludge conduit communicating with the lift well, and the sludge conduit is provided with a sludge pump.

3. The cofferdam construction wastewater treatment system of claim 1, further comprising a conditioning tank, wherein the conditioning tank is communicated with the high-efficiency preliminary sedimentation tank, and a sludge pump is arranged between the conditioning tank and the high-efficiency preliminary sedimentation tank.

4. The cofferdam construction wastewater treatment system of claim 2, further comprising a conditioning tank, wherein the conditioning tank is communicated with the high-efficiency preliminary sedimentation tank, and a sludge pump is arranged between the conditioning tank and the high-efficiency preliminary sedimentation tank;

the sludge pipeline is provided with a three-way valve, one port of the three-way valve is communicated with the lifting well, and the other port of the three-way valve is communicated with the hardening and tempering tank.

5. The cofferdam construction wastewater treatment system of claim 3 or 4, further comprising a dehydrator for dehydrating the sludge after conditioning.

6. The cofferdam construction wastewater treatment system of claim 5, further comprising a dewatering filtrate pump disposed at the dewatering machine liquid outlet and communicating with the coarse-screening tank.

7. The cofferdam construction wastewater treatment system of claim 1, wherein the coarse-grained tank water inlet is provided with a coagulant aid addition port.