CN209957614U - Nickel-containing wastewater treatment system - Google Patents
Nickel-containing wastewater treatment system Download PDFInfo
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- CN209957614U CN209957614U CN201920786235.6U CN201920786235U CN209957614U CN 209957614 U CN209957614 U CN 209957614U CN 201920786235 U CN201920786235 U CN 201920786235U CN 209957614 U CN209957614 U CN 209957614U
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Abstract
The utility model relates to a waste water treatment field particularly, relates to a nickeliferous effluent disposal system. The nickel-containing wastewater treatment system comprises a chemical reaction unit and an ion exchange unit; the chemical reaction unit comprises a complex breaking reaction tank, a precipitation chelation reaction tank and a coagulation sedimentation tank which are connected in sequence; the ion exchange unit comprises an ion exchange resin tank; the coagulating sedimentation tank is connected with the ion exchange resin tank. Above-mentioned nickel-containing wastewater treatment system can carry out joint treatment to complex attitude nickel and free state nickel in the waste water, and it is effectual to remove nickel, and the treatment cost is low.
Description
Technical Field
The utility model relates to a waste water treatment field particularly, relates to a nickeliferous effluent disposal system.
Background
The electroplating wastewater contains a large amount of heavy metal ions, which can cause serious pollution to the environment, and along with the increasing requirement on environmental protection, the discharge standard of the electroplating wastewater is improved from the initial GB21900-2008 'electroplating pollutant discharge standard' table 1 to the table 3 standard, and the discharge index of the total nickel is improved from the original 1.0mg/L to 0.1 mg/L. However, at present, the detection data of free nickel ions commonly used in China is taken as a design basis for removing the total nickel, the existence of the complex nickel is often ignored, and meanwhile, because the treatment difficulty of the complex nickel is higher and the requirement on the system is higher, the wastewater generated by enterprises in many electroplating industries cannot reach the standard and is discharged to face the risk of production halt or shutdown, so that the development of a total nickel treatment system for the wastewater in the electroplating industries is very urgent.
At present, the treatment method and the technology for the total nickel in the electroplating wastewater mainly comprise the following steps: chemical precipitation, membrane separation, biological treatment and the like, and a combined treatment method and technology for complex nickel and free nickel in water are lacked, so that the wastewater treated by the treatment processes cannot reach the standard and is discharged, and the treatment cost per ton of water is relatively high.
In view of this, the present invention is especially provided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a nickeliferous effluent disposal system to alleviate the unable problem that carries out joint treatment, remove that the nickel effect is poor, the treatment cost is high to complex attitude nickel and free state nickel in the waste water that exists among the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect, the utility model provides a nickel-containing wastewater treatment system, which comprises a chemical reaction unit and an ion exchange unit which are connected with each other;
the chemical reaction unit comprises a complex breaking reaction tank, a precipitation chelation reaction tank and a coagulation sedimentation tank which are connected in sequence;
the ion exchange unit comprises an ion exchange resin tank;
the coagulating sedimentation tank is connected with the ion exchange resin tank.
As a further preferable technical scheme, the chemical reaction unit further comprises a comprehensive adjusting tank and a pH adjusting tank which are connected in sequence, and the pH adjusting tank is further connected with the complex breaking reaction tank.
As a further preferable technical scheme, the precipitation chelation reaction tank comprises a precipitation reaction zone and a chelation reaction zone which are sequentially connected, the precipitation reaction zone is connected with the complex breaking reaction tank, and the chelation reaction zone is connected with the coagulation sedimentation tank.
As a further preferable technical scheme, the coagulation sedimentation tank comprises a coagulation reaction zone, a flocculation reaction zone and a sedimentation zone which are connected in sequence, the coagulation reaction zone is connected with the sedimentation chelation reaction tank, and the sedimentation zone is connected with the ion exchange resin tank.
As a further preferable technical scheme, the treatment system further comprises a biochemical reaction unit, and the biochemical reaction unit is respectively connected with the coagulating sedimentation tank and the ion exchange resin tank.
As a further preferable technical scheme, the biochemical reaction unit comprises a pH callback pool, a biochemical reaction pool, a secondary sedimentation pool and a filtering pool which are connected in sequence, the pH callback pool is connected with the coagulating sedimentation pool, and the filtering pool is connected with the ion exchange resin tank.
As a further preferred technical scheme, a biological biofilm formation combined filler and a microporous aerator pipe are arranged in the biochemical reaction tank, the biological biofilm formation combined filler is arranged in the biochemical reaction tank, and the microporous aerator pipe is arranged at the bottom of the biochemical reaction tank.
As a further preferable technical scheme, the treatment system further comprises a sludge treatment unit, and the sludge treatment unit is respectively connected with the sedimentation tank and the secondary sedimentation tank.
As a further preferable technical solution, the ion exchange unit further comprises a clean water tank, and the clean water tank is connected with the ion exchange resin tank.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a nickeliferous effluent disposal system connects gradually chemical reaction unit and ion exchange unit to optimize equipment type and the relation of connection in every unit, greatly promoted the system to the purification efficiency and the purification degree of complex state nickel and free state nickel, finally realize the purpose of waste water discharge to reach standard. Specifically, firstly, carrying out a complex breaking reaction on the wastewater in a complex breaking reaction tank, so that the complex nickel in the nickel-containing wastewater is dissociated to form free nickel; then carrying out precipitation reaction and chelation reaction in a precipitation chelation reaction tank to enable free nickel to generate water-insoluble particles and metal chelate; then carrying out coagulation sedimentation in a coagulation sedimentation tank, carrying out coagulation reaction on water-insoluble particles and colloidal substances in the wastewater to form larger alum blossom particles, and removing the alum blossom particles after sedimentation; then the wastewater enters an ion exchange resin tank for further exchange and adsorption of free nickel, so that the content of nickel in the wastewater is minimized, and the quality of the effluent is ensured.
The system can effectively and stably treat the complex nickel and the free nickel in the wastewater, can control the effluent concentration of the total nickel in the wastewater to be below 0.1mg/L, and can effectively reduce the wastewater treatment cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a nickel-containing wastewater treatment system provided in embodiment 1 of the present invention.
Icon: 1-a chemical reaction unit; 101-a comprehensive adjusting tank; 102-a pH adjusting tank; 103-complex breaking reaction tank; 104-a precipitation chelation reaction tank; 1041-a precipitation reaction zone; 1042 — a chelation reaction zone; 105-a coagulating sedimentation tank; 1051-a coagulation reaction zone; 1052-flocculation reaction zone; 1053-a precipitation zone; 2-a biochemical reaction unit; 201-pH is returned to the pool; 202-biochemical reaction tank; 203-a secondary sedimentation tank; 204-a filtering tank; 3-an ion exchange unit; 301-ion exchange resin tank; 302-clean water pool; 4-sludge treatment unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may for example be 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.
The utility model provides a nickel-containing wastewater treatment system, which comprises a chemical reaction unit and an ion exchange unit;
the chemical reaction unit comprises a complex breaking reaction tank, a precipitation chelation reaction tank and a coagulation sedimentation tank which are connected in sequence;
the ion exchange unit comprises an ion exchange resin tank;
the coagulating sedimentation tank is connected with the ion exchange resin tank.
The working process of the nickel-containing wastewater treatment system is divided into two stages of chemical treatment and ion exchange treatment, and the working principle is as follows:
chemical treatment: carrying out chemical treatment in a chemical reaction unit, and firstly carrying out a complex breaking reaction on the nickel-containing wastewater in a complex breaking reaction tank so as to free the complex nickel in the nickel-containing wastewater to form free nickel; then carrying out precipitation reaction and chelation reaction in a precipitation chelation reaction tank to enable free nickel to generate water-insoluble particles and metal chelate; then carrying out coagulation sedimentation in a coagulation sedimentation tank, carrying out coagulation reaction on water-insoluble particles and colloidal substances in the wastewater to form larger alum blossom particles, and removing the alum blossom particles after sedimentation;
ion exchange treatment: and (3) carrying out ion exchange treatment in an ion exchange unit, and further exchanging and adsorbing free nickel in the wastewater subjected to the chemical treatment in an ion exchange resin tank, so that the nickel content in the wastewater is further reduced, and the effluent quality is ensured.
Above-mentioned nickeliferous effluent disposal system connects gradually chemical reaction unit and ion exchange unit to optimize equipment type and the relation of connection in every unit, greatly promoted the system to the purification efficiency and the purification degree of complex state nickel and free state nickel, finally realize the purpose that waste water discharge to reach standard. The system can effectively and stably treat the complex nickel and the free nickel in the wastewater, can control the effluent concentration of the total nickel in the wastewater to be below 0.1mg/L, and can effectively reduce the wastewater treatment cost.
Preferably, the decomplexation agent in the decomplexation reaction tank is sodium hypochlorite. Experiments prove that the sodium hypochlorite is adopted as the complex breaking agent, so that three aspects of complex breaking effect, obtaining way and cost performance are comprehensively considered, and the complex breaking agent is superior to other agents with complex breaking function, such as ozone, hydrogen peroxide, chlorine dioxide or ferrous sulfate and the like.
Preferably, the nickel-containing wastewater comprises electroplating wastewater, and preferably comprises wastewater discharged from a pre-electroplating process of electroplating plant punch, polishing, rolling or acid washing activation. The waste water contains more complex nickel, and the residual complex nickel in the water still has 1-5ppm after the precipitation of the conventional alkaline substances.
In a preferred embodiment, the chemical reaction unit further comprises a comprehensive adjusting tank and a pH adjusting tank which are connected in sequence, and the pH adjusting tank is further connected with the complex breaking reaction tank. The nickel-containing wastewater firstly enters a comprehensive regulating reservoir, and is regulated by the comprehensive regulating reservoir, so that the uniformity of water quality can be improved, the changes of the water quality, the water quantity and the water temperature of the wastewater can be balanced and regulated, surplus water is stored, the shortage is complemented, and the water inflow of each subsequent reaction reservoir is uniformly distributed; then the pH value of the solution is adjusted to a reasonable range by a pH adjusting tank, so that the subsequent complex breaking reaction is convenient to carry out. "synthesize equalizing basin" also can be called the equalizing basin for short, can make canal and structure normally work on sewage treatment plant, do not receive the influence of waste water peak flow or concentration variation, the utility model discloses do not restrict very much to the concrete structure of synthesizing the equalizing basin, adopt current arbitrary equalizing basin, as long as can realize corresponding function can.
Preferably, the pH value in the pH adjusting tank is 2-3. The above pH is typically, but not limited to, 2, 2.2, 2.4, 2.6, 2.8 or 3.
In a preferred embodiment, the precipitation and chelation reaction tank comprises a precipitation reaction zone and a chelation reaction zone which are connected in sequence, the precipitation reaction zone is connected with the complex breaking reaction tank, and the chelation reaction zone is connected with the coagulation and precipitation tank. The sedimentation and chelation reaction tank is divided into two reaction zones, and the reaction zones are mutually independent, so that the sedimentation effect and the chelation effect are ensured. Through the precipitation of a precipitator in the precipitation reaction zone, most free nickel ions in the wastewater form water-insoluble nickel hydroxide particles, and the residual nickel ion-containing wastewater enters the chelation reaction zone to form stable metal chelate under the action of a chelating agent.
Preferably, the precipitant in the precipitation reaction zone comprises at least one of sodium hydroxide, potassium hydroxide or lime, and the chelating agent in the chelation reaction zone comprises xanthate heavy metal ion scavenger and/or dithiocarbamate derivative heavy metal ion scavenger. The precipitant is superior to other alkaline precipitant capable of forming nickel hydroxide precipitate with nickel, such as phosphate or citrate, and the chelating agent has strong chelating capacity, can effectively react with heavy metal to generate insoluble substance, and the resultant is difficult to release into environment.
Preferably, the pH in the precipitation reaction zone is 11-12. The above pH is typically, but not limited to, 11, 11.1, 11.2, 11.3, 11.4, 11.5, 11.6, 11.7, 11.8, 11.9 or 12. Waste water is when above-mentioned pH within range, is favorable to going on of precipitation reaction more, promotes the nickel ion of the overwhelming majority and generates nickel hydroxide precipitate granule, effectively improves purification efficiency and purifying effect.
In a preferred embodiment, the coagulation sedimentation tank comprises a coagulation reaction zone, a flocculation reaction zone and a sedimentation zone which are connected in sequence, the coagulation reaction zone is connected with the sedimentation chelation reaction tank, and the sedimentation zone is connected with the ion exchange resin tank. The coagulation reaction area is an area where wastewater and a coagulant are subjected to coagulation reaction, the flocculation reaction area is an area where wastewater and a flocculating agent are subjected to flocculation reaction, and the precipitation area is used for precipitating the wastewater after coagulation and flocculation.
Preferably, the coagulant in the coagulation reaction zone comprises polyaluminium chloride, polyferric sulfate, ferric trichloride, aluminum sulfate and the like, and the flocculant in the flocculation reaction zone comprises cationic polyacrylamide, anionic polyacrylamide and nonionic polyacrylamide.
Preferably, the settling zone is referred to as an inclined plate settling zone. The inclined plate sedimentation area refers to a sedimentation area with an inclined pipe arranged inside.
In a preferred embodiment, the treatment system further comprises a biochemical reaction unit, and the biochemical reaction unit is respectively connected with the coagulating sedimentation tank and the ion exchange resin tank. In the preferred embodiment, a Biochemical reaction unit is added, the Biochemical reaction unit can carry out Biochemical treatment on the wastewater treated by the coagulating sedimentation tank, and COD (Chemical Oxygen Demand) pollution indexes and BOD (Biochemical Oxygen Demand) pollution indexes in the wastewater are degraded by microorganisms.
In a preferred embodiment, the biochemical reaction unit comprises a pH adjusting tank, a biochemical reaction tank, a secondary sedimentation tank and a filtering tank which are connected in sequence, wherein the pH adjusting tank is connected with the coagulating sedimentation tank, and the filtering tank is connected with the ion exchange resin tank. After the wastewater passes through the coagulating sedimentation tank, firstly, the pH is regulated back through a pH regulation back tank to enable the pH of the wastewater to be suitable for the existence of microorganisms, then the wastewater enters a biochemical reaction tank to carry out biochemical reaction, COD (chemical oxygen demand) pollution indexes and BOD (biochemical oxygen demand) pollution indexes in the wastewater are adsorbed and degraded by the microorganisms, then the precipitate obtained through the biochemical reaction tank is precipitated through a secondary sedimentation tank, and then the precipitate is filtered through a filter tank, and the obtained filtrate is put into an ion exchange resin tank.
Preferably, the pH in the pH adjusting tank is 6-9. The above pH is typically, but not limited to, 6, 6.2, 6.4, 6.6, 6.8, 7, 7.2, 7.4, 7.6, 7.8, 8, 8.2, 8.4, 8.6, 8.8 or 9; the pH value is more beneficial to the growth of organisms in the biochemical reaction tank.
In a preferred embodiment, a biological biofilm formation combined filler and a microporous aerator pipe are arranged in the biochemical reaction tank, the biological biofilm formation combined filler is arranged in the biochemical reaction tank, and the microporous aerator pipe is arranged at the bottom of the biochemical reaction tank. The biological biofilm formation combined filler can carry out microbial treatment on wastewater, and the microporous aeration pipe at the bottom of the tank can carry out aeration and oxygen supply on water, so that the treatment effect is ensured.
The biological biofilm culturing combined filler and the microporous aeration pipe can be selected from any one or more of the prior biological biofilm culturing combined filler and microporous aeration pipe, and the utility model is not particularly limited.
It should be noted that the biochemical reaction unit may further include water treatment process equipment such as a multi-media filter, a valveless filter, a V-type filter, etc., as long as the removal rate of Suspended Solids (SS) in water can be further improved, and good water inlet conditions are provided for the subsequent nickel removal unit.
In a preferred embodiment, the ion exchange unit further comprises a clean water tank connected to the ion exchange resin tank. After the nickel is exchanged by the ion exchange resin in the ion exchange resin tank, the total nickel content of the effluent is reduced to the minimum, and the effluent is discharged into a clean water tank and then discharged after reaching the standard.
Preferably, the ion exchange resin tank includes a chelating resin including at least one of a sulfamic acid type resin, an iminodiacetic acid type resin, an aminophosphoric acid type resin, an amidoxime type resin, a pyridine type resin, a polyamine type resin, a dithiocarbamate type resin, or a thiol type resin. The chelate resin can selectively adsorb high-valence metal ions in water, and performs a coordination reaction with the high-valence metal ions in the water to form a stable structure similar to a micromolecule chelate.
In a preferred embodiment, the treatment system further comprises a sludge treatment unit, and the sludge treatment unit is respectively connected with the coagulating sedimentation tank and the secondary sedimentation tank. And conveying the sludge obtained by sedimentation in the sedimentation zone and the secondary sedimentation tank to a sludge treatment unit for dehydration treatment by a filter press and the like to obtain a sludge cake and conveying the sludge cake out.
The utility model discloses through the mechanical structure who optimizes each equipment among each preferred embodiment, optimize the selection of each chemical reaction and biochemical reaction's medicine, throw the volume and the combination each other, improved the reaction efficiency of each unit, improve purifying effect, reduce the treatment cost.
Example 1
A certain electroplating limited company in Shanghai is mainly responsible for producing nickel-coated steel products, and the discharged wastewater is mainly divided into two parts: one part is waste water discharged by the electroplating pretreatment processes such as polishing, punching, rolling and the like, and the personnel in the company are called as: the main water quality parameters of the organic wastewater in the comprehensive regulating tank after mixing are as follows: COD 400mg/L, total Ni 15mg/L, pH 7-12. The other part is waste water discharged after electroplating, and the personnel in the company are called as: the main water quality parameters of the inorganic waste water in the comprehensive regulating tank after mixing are that total nickel is 200mg/L and pH is 2. The factory faces the water quality index discharged by the heavy-metal-related enterprise issued by the municipal administration and the regional administration, wherein the total nickel index related to heavy metals is improved from the original GB21900-2008 'discharge Standard of electroplating pollutants' Table 2 standard to the standard of Table 3 standard.
The factory area is a bidding improvement project, the problem of detecting the content of nickel ions in the factory water of two wastewater stations exists all the time, and the difference between the total nickel value and the nickel ion value is found to be large through comparison of the total nickel index issued by an authoritative third-party detection mechanism, particularly the water output of an organic wastewater station.
The original treatment process of the organic wastewater station is 'lime coagulating sedimentation + pH readjustment tank + biological contact oxidation + secondary sedimentation tank + valveless filter tank + clean water tank' which lacks the treatment process of complex nickel, so that the company dispatches technicians to verify through a large amount of experimental data on site: the nickel in the complex state contained in the raw water must first be freed for better removal. According to a laboratory pilot test and a field pilot test, a sodium hypochlorite solution is finally selected as a complex breaking agent, a heavy metal ion capturing agent is added, and in order to ensure that the quality of the effluent water stably reaches the standard, an ion exchange resin unit is arranged in front of a water outlet pool. Because the heavy metal ion trapping agent can trap metal ions with a valence of more than 2, if lime is added for precipitating free nickel ions, the use amount of the heavy metal ion trapping agent can be influenced by the residual calcium ions, and the exchange amount of a rear-end ion exchange unit is also influenced, the pH value of the wastewater after the complexation breaking is adjusted to 11.5 by using sodium hydroxide, and then PAC is used for coagulation.
The nickel-containing wastewater treatment system after upgrading transformation is shown in figure 1 and comprises a chemical reaction unit 1, a biochemical reaction unit 2 and an ion exchange unit 3 which are connected in sequence;
the chemical reaction unit 1 comprises a comprehensive adjusting tank 101 and a pH adjusting tank 102 (the pH adjusting agent is H)2SO4) The system comprises a complex breaking reaction tank 103 (a complex breaking agent is sodium hypochlorite), a precipitation chelation reaction tank 104 and a coagulation sedimentation tank 105, wherein the precipitation chelation reaction tank 104 comprises a precipitation reaction zone 1041 (a precipitating agent is sodium hydroxide) and a chelation reaction zone 1042 (a chelating agent is a heavy metal ion capturing agent) which are connected with each other, and the coagulation sedimentation tank 105 comprises a coagulation reaction zone 1051 (a coagulant is PAC), a flocculation reaction zone 1052 (a flocculating agent is PAM) and a sedimentation zone 1053 which are connected in sequence;
the biochemical reaction unit 2 comprises a pH callback pool 201, a biochemical reaction pool 202, a secondary sedimentation pool 203 and a filter pool 204 which are connected in sequence;
the ion exchange unit 3 includes an ion exchange resin tank 301 and a clean water tank 302 connected to each other;
in addition, the system further comprises a sludge treatment unit 4, and the sludge treatment unit 4 is respectively connected with the sedimentation zone 1053 and the secondary sedimentation tank 203.
The working process of the nickel-containing wastewater treatment system is divided into three stages of chemical treatment, biochemical treatment and ion exchange treatment, and the working principle is as follows:
chemical treatment: carrying out chemical treatment in a chemical reaction unit, homogenizing nickel-containing wastewater after being adjusted by a comprehensive adjusting tank, adjusting the pH value of the nickel-containing wastewater to 2-3 in a pH adjusting tank, and completing a complex breaking reaction in the complex breaking reaction tank through a sodium hypochlorite solution so as to enable complex nickel in the nickel-containing wastewater to be dissociated to form free nickel; adding a sodium hydroxide solution into a precipitation reaction zone of a precipitation chelation reaction tank, adjusting the pH value of the wastewater to 11.5, so that most free nickel ions in the water are generated into water-insoluble nickel hydroxide, adding a heavy metal ion capture agent into the chelation reaction zone, chelating the remaining free nickel ions in the water, and forming a stable metal chelate with the free nickel in the water; in a coagulation sedimentation tank, adding polyaluminium chloride (PAC) into a coagulation reaction zone and adding Polyacrylamide (PAM) into a flocculation reaction zone to carry out coagulation reaction and flocculation reaction on colloidal substances and generated water-insoluble particles in wastewater to form larger alum blossom particles, and removing the alum blossom particles through the sedimentation zone;
biochemical treatment: carrying out chemical treatment in a biochemical reaction unit, firstly, adjusting the pH value of the wastewater to 7-9 in a pH adjusting tank (adding sulfuric acid) after the chemical treatment, then, entering the biochemical reaction tank for biochemical reaction, and adsorbing and degrading COD (chemical oxygen demand) pollution indexes and BOD (biochemical oxygen demand) pollution indexes in the wastewater by using microorganisms; then, the sediment obtained by the biochemical reaction tank is precipitated by a secondary precipitation tank, so that COD and BOD pollution indexes are removed; filtering out the precipitate in a filtering tank;
ion exchange treatment: and carrying out ion exchange treatment in an ion exchange unit, further exchanging and adsorbing free nickel in the wastewater subjected to the biochemical treatment in an ion exchange resin tank, further reducing the nickel content in the wastewater, ensuring the quality of effluent, and temporarily storing the effluent reaching the standard into a clean water tank.
The transformation in 2018 and 1 month is completed, so far, the total nickel content of the effluent of the clean water tank is maintained below 0.05mg/L, and the total nickel content meets the discharge standard of table 3 in GB21900-2008 'discharge Standard of electroplating pollutants', so that the plant continues to normally operate, and the shutdown risk is avoided.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the technical solutions of the embodiments of the present invention.
Claims (9)
1. A nickel-containing wastewater treatment system is characterized by comprising a chemical reaction unit and an ion exchange unit;
the chemical reaction unit comprises a complex breaking reaction tank, a precipitation chelation reaction tank and a coagulation sedimentation tank which are connected in sequence;
the ion exchange unit comprises an ion exchange resin tank;
the coagulating sedimentation tank is connected with the ion exchange resin tank.
2. The nickel-containing wastewater treatment system according to claim 1, wherein the chemical reaction unit further comprises a comprehensive adjusting tank and a pH adjusting tank which are connected in sequence, and the pH adjusting tank is further connected with the complex breaking reaction tank.
3. The nickel-containing wastewater treatment system according to claim 1, wherein the precipitation chelation reaction tank comprises a precipitation reaction zone and a chelation reaction zone which are connected in sequence, the precipitation reaction zone is connected with the complex breaking reaction tank, and the chelation reaction zone is connected with the coagulation sedimentation tank.
4. The nickel-containing wastewater treatment system according to claim 1, wherein the coagulation sedimentation tank comprises a coagulation reaction zone, a flocculation reaction zone and a sedimentation zone which are connected in sequence, the coagulation reaction zone is connected with the sedimentation chelation reaction tank, and the sedimentation zone is connected with the ion exchange resin tank.
5. The nickel-containing wastewater treatment system according to any one of claims 1 to 4, wherein the treatment system further comprises a biochemical reaction unit, and the biochemical reaction unit is respectively connected with the coagulation sedimentation tank and the ion exchange resin tank.
6. The nickel-containing wastewater treatment system according to claim 5, wherein the biochemical reaction unit comprises a pH adjusting tank, a biochemical reaction tank, a secondary sedimentation tank and a filtering tank which are connected in sequence, the pH adjusting tank is connected with the coagulating sedimentation tank, and the filtering tank is connected with the ion exchange resin tank.
7. The nickel-containing wastewater treatment system according to claim 6, wherein a biofilm culturing combined filler and a microporous aerator pipe are arranged in the biochemical reaction tank, the biofilm culturing combined filler is arranged in the biochemical reaction tank, and the microporous aerator pipe is arranged at the bottom of the biochemical reaction tank.
8. The nickel-containing wastewater treatment system according to claim 6, further comprising a sludge treatment unit, wherein the sludge treatment unit is connected to the coagulation sedimentation tank and the secondary sedimentation tank, respectively.
9. The nickel-containing wastewater treatment system according to any one of claims 1 to 4, wherein the ion exchange unit further comprises a clean water tank, and the clean water tank is connected to the ion exchange resin tank.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111252942A (en) * | 2020-02-21 | 2020-06-09 | 定颖电子(黄石)有限公司 | Imidazole-containing chemical silver plating wastewater treatment system and method |
| CN111606511A (en) * | 2020-05-25 | 2020-09-01 | 中信环境技术（广州）有限公司 | Treatment device and treatment method for electroplating nickel-containing wastewater |
| CN113562877A (en) * | 2021-07-26 | 2021-10-29 | 中南大学 | Treatment method of EDTA-Ni-containing wastewater |
-
2019
- 2019-05-28 CN CN201920786235.6U patent/CN209957614U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111252942A (en) * | 2020-02-21 | 2020-06-09 | 定颖电子(黄石)有限公司 | Imidazole-containing chemical silver plating wastewater treatment system and method |
| CN111606511A (en) * | 2020-05-25 | 2020-09-01 | 中信环境技术（广州）有限公司 | Treatment device and treatment method for electroplating nickel-containing wastewater |
| CN113562877A (en) * | 2021-07-26 | 2021-10-29 | 中南大学 | Treatment method of EDTA-Ni-containing wastewater |
| CN113562877B (en) * | 2021-07-26 | 2022-09-06 | 中南大学 | Treatment method of EDTA-Ni-containing wastewater |
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