CN217947893U

CN217947893U - Centralized control district high concentration COD electroplating wastewater centralized treatment system

Info

Publication number: CN217947893U
Application number: CN202221535849.5U
Authority: CN
Inventors: 费西凯; 黄炜; 吴健; 黄杨坤
Original assignee: Quanzhou Cecep Water Treatment Technology Co ltd
Current assignee: Quanzhou Cecep Water Treatment Technology Co ltd
Priority date: 2022-06-18
Filing date: 2022-06-18
Publication date: 2022-12-02
Anticipated expiration: 2032-06-18

Abstract

The application relates to the field of sewage treatment technology, in particular to a centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area, which comprises a coagulating sedimentation tank, a centralized tank and a post centralized treatment system; a plurality of coagulating sedimentation tanks are arranged and are respectively used for allowing different types of electroplating wastewater to flow in; the plurality of coagulating sedimentation tanks are connected with the concentration tank through pipelines, and the concentration tank is used for containing supernatant liquid from the plurality of coagulating sedimentation tanks; the rear centralized treatment system is used for treating the liquid in the centralized pool to a discharge standard. This application has the effect of considering sparingly making and the maintenance cost when high-efficient COD in getting rid of electroplating effluent.

Description

Centralized control district high concentration COD electroplating wastewater centralized treatment system

Technical Field

The application relates to the field of sewage treatment technology, in particular to a centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area.

Background

Compared with general industrial wastewater and domestic sewage, the high-concentration COD electroplating wastewater in the centralized control area has the following obvious characteristics: the treatment difficulty of the high-concentration electroplating wastewater is far higher than that of general industrial wastewater and domestic sewage, along with the improvement of public environmental awareness and the stricter restriction standards of domestic and foreign discharge indexes, the development of economic and efficient sewage treatment technology is always a hotspot in the field of water pollution control engineering.

For electroplating wastewater with high Chemical Oxygen Demand (COD), the existing method mostly adopts a precipitation method for treatment, but because the components of the electroplating wastewater are complex, all indexes of treatment liquid after precipitation treatment cannot meet the existing environmental protection standards, and the treatment process is complex. On the basis, a treatment method for treating the electroplating wastewater with high COD is developed, different types of electroplating wastewater are treated independently, but different types of electroplating wastewater are treated independently, which means that the construction and maintenance costs of the whole wastewater treatment system are greatly increased, if different types of electroplating wastewater are treated in a unified way, the impact load of the whole wastewater treatment system is increased, and the COD removal efficiency is low, so that the wastewater treatment system which can effectively remove COD in the electroplating wastewater and save the manufacturing and maintenance costs is urgently needed.

SUMMERY OF THE UTILITY MODEL

In order to compromise when getting rid of COD among the electroplating effluent high efficiency and save manufacturing and maintenance cost, this application provides a centralized control district high concentration COD electroplating effluent centralized processing system.

The application provides a centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area adopts the following technical scheme:

a centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area comprises a coagulating sedimentation tank, a centralized tank and a post centralized treatment system; the coagulation sedimentation tanks are provided in plurality and are respectively used for allowing electroplating wastewater of different types to flow in; the multiple coagulating sedimentation tanks are connected to the centralized tank through pipelines, and the centralized tank is used for accommodating the supernatant liquid from the multiple coagulating sedimentation tanks; the rear centralized treatment system is used for treating the liquid in the centralized pool to a discharge standard.

Through adopting above-mentioned technical scheme, discharge the electroplating effluent of different grade type to a plurality of coagulating sedimentation pond respectively in, carry out preliminary reduction with the COD in the electroplating effluent of different grade type, then collect the electroplating effluent of the different grade type that the COD reduces preliminarily to concentrated in the pond, rearmounted centralized processing system will concentrate COD in the pond and handle to emission standard at last. Compare in still to electroplating effluent single treatment to the different grade type or electroplating effluent centralized processing's waste water treatment system to the different grade type, through the preliminary reduction of a plurality of coagulating sedimentation ponds to COD, rearmounted centralized processing system is with the electroplating effluent centralized processing's waste water treatment system that COD reduces preliminarily again, not only reduce the waste water treatment system's of electroplating effluent single treatment to the different grade type construction and maintenance cost, still reduce the impact load to whole waste water treatment system when the electroplating effluent centralized processing of different grade type, compromise when realizing the high-efficient COD of getting rid of electroplating effluent and save the effect of making and maintaining the cost.

Optionally, a transition groove is arranged at a tank opening of the coagulating sedimentation tank, and the transition groove is used for guiding electroplating wastewater to flow into an inner cavity of the coagulating sedimentation tank; a plurality of hydraulic jump strips are arranged at the bottom of the transition groove; the plurality of hydraulic jump strips are arranged at intervals along the flowing direction of water flow in the transition groove; the hydraulic jump strip is used for forcing water flow to form a hydraulic jump phenomenon in the transition groove.

Through adopting above-mentioned technical scheme, at electroplating effluent through the inner chamber in-process that crosses the aqueduct and flow into coagulating sedimentation tank, electroplating effluent forms the hydraulic jump phenomenon through a plurality of hydraulic jump strips in crossing the aqueduct, weakens electroplating effluent and flows into the kinetic energy of coagulating sedimentation tank inner chamber to when electroplating effluent flows into coagulating sedimentation tank, reduce coagulating sedimentation tank's inner wall and by the risk that electroplating effluent erodees, improve coagulating sedimentation tank's life.

Optionally, a medicament injection nozzle is arranged at the groove top of the transition groove far away from the hydraulic jump strip; the agent injection nozzle is used for injecting a coagulant and a flocculant into the transition tank.

By adopting the technical scheme, when the electroplating wastewater flows into the transition groove, the coagulant and the flocculant are injected into the transition groove by the agent injection nozzle, and the electroplating wastewater forms a water jump phenomenon in the transition groove through the plurality of water jump strips, so that the coagulant and the flocculant can be quickly combined with the surging electroplating wastewater in the transition groove, and the COD reduction efficiency of the electroplating wastewater is improved.

Optionally, the plurality of medicament injection nozzles are arranged at intervals along the flowing direction of the water flow in the transition groove.

By adopting the technical scheme, the content of the coagulant and the flocculant in the electroplating wastewater is further improved, and the reduction efficiency of COD in the electroplating wastewater is further improved.

Optionally, the post-centralized treatment system comprises a chemical sedimentation tank, a PH adjusting tank, a biochemical treatment tank and an MBR biological reaction tank which are connected in sequence through pipelines.

Through adopting above-mentioned technical scheme, harmful substance such as the heavy metal that contains in the chemical precipitation pond supernatant carries out the preliminary treatment, and the liquid adjustment in the pond will concentrate to the PH value that is fit for the microorganism to live, and then the liquid in the PH equalizing basin flows into and carries out biochemical reaction in the biochemical treatment pond, makes unstable organic substance and inorganic poison convert nontoxic material into, and then the COD in the biochemical treatment pond liquid after handling the MBR biological reaction pond further reduces to emission standard.

Optionally, the chemical sedimentation tank, the biochemical treatment tank and the coagulating sedimentation tank are all connected with a sludge filter press, and a water outlet pipeline of the sludge filter press is connected with the coagulating sedimentation tank.

Through adopting above-mentioned technical scheme, the sludge press filter is with the sludge press filter in chemical sedimentation pond, biochemical treatment pond and the coagulating sedimentation pond, collects the filter cake and deposits to the assigned position, and liquid after the filter-pressing flows back and washs in the coagulating sedimentation pond, realizes water cyclic utilization's effect.

Optionally, the chemical sedimentation tank, the biochemical treatment tank and the coagulating sedimentation tank are all connected to the same sludge storage tank through pipelines; and the sludge storage tank is connected with the sludge filter press through a pipeline.

Through adopting above-mentioned technical scheme, through storing the mud pond, alleviate sludge filter press's operating load, reduce sludge filter press's continuous opening time to reduce sludge filter press's operating time, improve sludge filter press's life.

Optionally, a spraying device is installed on the upper portion of the biochemical treatment tank, the spraying device is connected to the MBR biological reaction tank through a pipeline, and the spraying device is used for spraying part of water treated by the MBR biological reaction tank to biochemical foam in the biochemical treatment tank.

By adopting the technical scheme, the biochemical foam in the biochemical treatment tank can be frozen in winter, and is difficult to clean; in summer, the biochemical foam is sprayed by the spraying device, so that the water recycling effect is realized, and the accumulation of the biochemical foam is effectively reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. compared with a wastewater treatment system for independently treating different types of electroplating wastewater or intensively treating different types of electroplating wastewater, the system has the advantages that the COD is preliminarily reduced through the multiple coagulating sedimentation tanks, the electroplating wastewater with the preliminarily reduced COD is intensively treated to the wastewater treatment system with the emission standard by the rear centralized treatment system, the construction and maintenance costs of the wastewater treatment system for independently treating different types of electroplating wastewater are reduced, the impact load on the whole wastewater treatment system during centralized treatment of different types of electroplating wastewater is reduced, the COD in the electroplating wastewater is efficiently removed, and meanwhile, the manufacturing and maintenance costs are saved;

2. through the transition groove and the hydraulic jump strip, when the coagulant and the flocculant are injected into the transition groove by the agent injection nozzle, the coagulant and the flocculant can be rapidly combined with the surging electroplating wastewater in the transition groove, so that the COD reduction efficiency of the electroplating wastewater is improved;

3. the spraying device sprays the biochemical foam, so that the water recycling effect is realized, and the accumulation of the biochemical foam is effectively reduced.

Drawings

FIG. 1 is a block diagram of the overall structure of a centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area according to an embodiment of the present application.

Fig. 2 is a schematic view showing the installation positions of the transition groove and the medicine nozzle according to the embodiment of the present application.

FIG. 3 is a block diagram showing the structure of sludge treatment in a coagulation sedimentation tank, a chemical sedimentation tank and a biochemical treatment tank according to the embodiment of the present invention.

FIG. 4 is a block diagram showing the processing structure of the product of the MBR biological reaction tank in the embodiment of the present application.

Description of the reference numerals: 1. a coagulating sedimentation tank; 2. a centralized pool; 3. a centralized processing system is arranged at the rear; 31. a chemical sedimentation tank; 32. a pH adjusting tank; 33. a biochemical treatment tank; 331. an anaerobic zone; 332. an anoxic zone; 333. an aerobic zone; 34. an MBR biological reaction tank; 4. a transition groove; 5. a hydraulic jump strip; 6. a medicament injection nozzle; 7. a sludge storage tank; 8. a sludge filter press; 9. and (4) a spraying device.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses centralized treatment system for high-concentration COD electroplating wastewater in centralized control area.

Referring to fig. 1, a centralized treatment system for high concentration COD electroplating wastewater in a centralized control area comprises a plurality of coagulation sedimentation tanks 1, a centralized tank 2 and a post-centralized treatment system 3, wherein the coagulation sedimentation tanks 1 are respectively used for allowing different types of electroplating wastewater to flow in, such as paint spraying wastewater, aging liquid, oil-containing wastewater and the like. The multiple coagulating sedimentation tanks 1 are connected with the concentration tank 2 through pipelines, and in other embodiments, biochemical tanks are arranged between the coagulating sedimentation tank 1 containing the oily wastewater and the concentration tank 2. The centralized pool 2 is used for containing supernatant liquid from a plurality of coagulating sedimentation pools 1, and the post centralized treatment system 3 is used for treating liquid in the centralized pool 2 to a discharge standard.

Referring to fig. 2, specifically, a submersible mixer is fixed on the inner wall of the coagulation sedimentation tank 1, and is used for mixing the liquid in the coagulation sedimentation tank 1, and in other embodiments, the submersible mixer is a flocculation vertical mixer or other mixing mechanism. A transition groove 4 is poured and fixed at the mouth of the coagulating sedimentation tank 1, the transition groove 4 is used for guiding electroplating wastewater to flow into the inner cavity of the coagulating sedimentation tank 1, and the transition groove 4 is obliquely arranged. The transition groove 4 may be a spiral groove-shaped structure, may be a rectangular parallelepiped groove-shaped structure, or the like. The plurality of hydraulic jump strips 5 are integrally formed at the bottom of the transition groove 4, the hydraulic jump strips 5 are used for forcing water flow to form a hydraulic jump phenomenon in the transition groove 4, and the plurality of hydraulic jump strips 5 are arranged at intervals along the flowing direction of the water flow in the transition groove 4. The length of the transition tank 4 is enough to abandon the stirring mechanism in the coagulating sedimentation tank 1.

Referring to fig. 2, a plurality of agent nozzles 6 are fixed on the top of the transition groove 4 away from the hydraulic jump strip 5, and coagulant and flocculant are respectively injected into the transition groove 4 through the agent nozzles 6. The plurality of agent nozzles 6 are arranged at intervals along the flowing direction of the water flow in the transition groove 4. The plurality of agent nozzles 6 are all connected with an automatic dosing control system through pipelines, and the dosage and the feeding time of the coagulant and the flocculant are matched through the automatic dosing control system. It should be noted that the order of the dosing of the agents is that the coagulant is first added and then the flocculant is added. Through water jump strip 5 and medicament nozzle 6, when electroplating effluent was carried to transition groove 4 in with the pump, medicament nozzle 6 was injected coagulant and flocculating agent into to transition groove 4, because electroplating effluent forms the water jump phenomenon through a plurality of water jump strips 5 in transition groove 4, consequently coagulant and flocculating agent can combine with the electroplating effluent who surges fast in transition groove 4, improve the reduction efficiency of COD in the electroplating effluent, reduce dive mixer's operation duration simultaneously, save dive mixer's power consumption.

Referring to fig. 1, the post-centralized treatment system 3 includes a chemical precipitation tank 31, a PH adjusting tank 32, a biochemical treatment tank 33 and an MBR biological reaction tank 34 connected in sequence through pipes, and after the liquid in the centralized tank 2 is conveyed into the chemical precipitation tank 31 by a pump, an alkaline substance is added into an inner cavity of the chemical precipitation tank 31 to adjust the PH value so that heavy metal ions generate insoluble hydroxides to precipitate and separate, that is, harmful substances such as heavy metals contained in the supernatant in the coagulation precipitation tank 1 are pretreated by a hydroxide precipitation method.

Referring to fig. 1, a PH detection probe is fixed on the inner wall of the PH adjusting tank 32, and the PH detection probe is electrically connected with a PH automatic control system. After the chemical sedimentation tank 31 reaches the designated standing sedimentation time, the supernatant in the chemical sedimentation tank 31 is conveyed to the PH adjusting tank 32 by a pump, and then the PH value in the PH adjusting tank 32 is adjusted by the automatic PH control system, so that the PH value of the liquid in the PH adjusting tank 32 meets the living environment requirement of the microorganism of the biochemical reaction.

Referring to fig. 1, the biochemical treatment tank 33 includes an anaerobic zone 331, an anoxic zone 332 and an aerobic zone 333 which are sequentially connected by pipes, after the PH value in the PH adjustment tank 32 reaches a specified value, water in the PH adjustment tank 32 is conveyed to the anaerobic zone 331 by a pump for hydrolysis acidification, after a specified time period, liquid in the anaerobic zone 331 is conveyed to the anoxic zone 332 by a pump for denitrification, and after the specified time period, liquid in the anoxic zone 332 is pumped to the aerobic zone 333 by a pump for nitrification. The terminal pipe connection MBR biological reaction pond 34 of good oxygen pond, reduce the COD in the liquid in the good oxygen pond to emission standard through MBR biological reaction pond 34, COD reaches emission standard's liquid can collect in the collection pond, also can flow into municipal pipe network. The concentrated solution in the MBR biological reaction tank 34 is conveyed to the anaerobic zone 331 through a pump to participate in the circulation of the sludge.

Referring to fig. 3, it is noted that the chemical precipitation tank 31, the biochemical treatment tank 33 and the coagulation precipitation tank 1 are all connected to the same sludge storage tank 7 through pipelines, and the sludge storage tank 7 is used for containing sludge pumped from the chemical precipitation tank 31, the biochemical treatment tank 33 and the coagulation precipitation tank 1. The pipeline of the sludge storage tank 7 is connected with a sludge filter press 8, the sludge filter press 8 is used for sludge filter pressing of the sludge storage tank 7, filter cakes after filter pressing are stored to a specified position for collection, and a water outlet pipeline of the sludge filter press 8 is connected to the coagulating sedimentation tank 1 so as to use water after filter pressing to wash the coagulating sedimentation tank 1.

Referring to fig. 4, a spraying device 9 is fixedly installed on the upper portion of the biochemical treatment tank 33, the spraying device 9 is connected to the MBR biological reaction tank 34 through a pipeline, and the spraying device 9 is used for spraying part of water treated by the MBR biological reaction tank 34 on biochemical foam in the biochemical treatment tank 33. The significance of the design of the spray device 9 lies in: biochemical foam in the biochemical treatment pond 33 can freeze winter, and the clearance is more difficult, and summer meeting wind is waved, forms bad smell, and serious polluted environment sprays the defoaming to biochemical foam through spray set 9, not only realizes water cyclic utilization's effect, effectively reduces the gathering of biochemical foam simultaneously.

Referring to fig. 4, the spraying device 9 may be a plurality of spraying pipes erected on the upper portion of the biochemical treatment tank 33, the plurality of spraying pipes are connected to the same water outlet main pipe, and a water inlet pipe of the water outlet main pipe is connected to a water pump for pumping water treated by the MBR biological reaction tank 34. In other embodiments, the spraying device 9 may also be a water outlet main pipe, the periphery of which is communicated and fixed with a plurality of rotary nozzles, and the water inlet pipe of the water outlet main pipe is connected with a water pump for pumping the water treated by the MBR biological reaction tank 34.

The implementation principle of the centralized treatment system for the high-concentration COD electroplating wastewater in the centralized control area is as follows: the electroplating wastewater of different types is discharged into transition tank 4 of multiple coagulating sedimentation tanks 1 respectively, then automatic reagent feeding control system and submersible mixer start, the automatic reagent feeding control system passes through medicament nozzle 6, pour into coagulant and flocculating agent to the electroplating wastewater in transition tank 4, submersible mixer stirs the electroplating wastewater in coagulating sedimentation tank 1, make the electroplating wastewater of different types flocculate and precipitate in multiple coagulating sedimentation tanks 1 respectively, carry out preliminary reduction to COD in the electroplating wastewater of different types.

After the specified flocculation and precipitation time is reached, supernatant in the plurality of coagulation and precipitation tanks 1 is pumped into the concentration tank 2 by using a pump to be collected, then liquid in the concentration tank 2 is pumped into the chemical precipitation tank 31 by using the pump to carry out pretreatment on toxic substances, and then the liquid in the chemical precipitation tank 31 is pumped into the pH adjusting tank 32 by using the pump to carry out pH value adjustment so as to enable the liquid in the pH adjusting tank 32 to meet the requirement of the living environment of the microorganism of the biochemical reaction. Then the liquid in the PH adjusting tank 32 is pumped into a biochemical treatment tank 33 by a pump for biochemical treatment, and finally the water after biochemical treatment is pumped into an MBR biological reaction tank 34 for purification treatment, so that the COD in the electroplating wastewater is treated to the discharge standard.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a centralized control district high concentration COD electroplating wastewater centralized processing system which characterized in that: comprises a coagulating sedimentation tank (1), a concentration tank (2) and a post-positioned centralized treatment system (3); a plurality of coagulating sedimentation tanks (1) are arranged, and the plurality of coagulating sedimentation tanks (1) are respectively used for allowing different types of electroplating wastewater to flow in; the plurality of the coagulating sedimentation tanks (1) are all connected to the concentration tank (2) through pipelines, and the concentration tank (2) is used for containing supernatant liquid from the plurality of the coagulating sedimentation tanks (1); the postposition centralized treatment system (3) is used for treating the liquid in the centralized pool (2) to the discharge standard, and the postposition centralized treatment system (3) comprises a chemical sedimentation pool (31), a PH regulating pool (32), a biochemical treatment pool (33) and an MBR biological reaction pool (34) which are sequentially connected through pipelines.

2. The centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area according to claim 1, characterized in that: a transition groove (4) is arranged at the mouth of the coagulating sedimentation tank (1), and the transition groove (4) is used for guiding electroplating wastewater to flow into the inner cavity of the coagulating sedimentation tank (1); a plurality of hydraulic jump strips (5) are arranged at the bottom of the transition groove (4); the plurality of hydraulic jump strips (5) are arranged at intervals along the flowing direction of water flow in the transition groove (4); the hydraulic jump strip (5) is used for forcing water flow to form a hydraulic jump phenomenon in the transition groove (4).

3. The centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area according to claim 2, characterized in that: a medicament injection nozzle (6) is arranged at the groove top of the transition groove (4) far away from the hydraulic jump strip (5); the agent injection nozzle (6) is used for injecting a coagulant and a flocculant into the transition tank (4).

4. The centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area according to claim 3, characterized in that: the plurality of the agent injection nozzles (6) are arranged, and the agent injection nozzles (6) are arranged at intervals along the flowing direction of water flow in the transition groove (4).

5. The centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area according to claim 1, characterized in that: the chemical sedimentation tank (31), the biochemical treatment tank (33) and the coagulating sedimentation tank (1) are all connected with a sludge filter press (8), and a water outlet pipeline of the sludge filter press (8) is connected with the coagulating sedimentation tank (1).

6. The centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area according to claim 5, characterized in that: the chemical sedimentation tank (31), the biochemical treatment tank (33) and the coagulating sedimentation tank (1) are all connected to the same sludge storage tank (7) through pipelines; the sludge storage pool (7) is connected with the sludge filter press (8) through a pipeline.

7. The centralized treatment system for high-concentration COD electroplating wastewater in a centralized control area according to claim 1, characterized in that: spray set (9) is installed on the upper portion of biochemical treatment pond (33), spray set (9) pipe connection in MBR biological reaction pond (34), spray set (9) are used for with the water of a portion after MBR biological reaction pond (34) is handled is to biochemical foam in biochemical treatment pond (33) sprays.