CN112358084A - Method for treating zinc-nickel alloy electroplating wastewater - Google Patents
Method for treating zinc-nickel alloy electroplating wastewater Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Abstract
The invention belongs to the field of methods for treating electroplating wastewater, and provides a method for treating zinc-nickel alloy electroplating wastewater, which comprises the steps of firstly adjusting the pH value of the zinc-nickel alloy electroplating wastewater, then adopting a sodium dimethyldithiocarbamate aqueous solution to treat, so that zinc and nickel in the zinc-nickel alloy electroplating wastewater form precipitates, then sequentially adding a coagulant aid, a flocculating agent and an adsorbent into the obtained mixed liquid to treat, and adsorbing the separated supernatant by using macroporous adsorption resin columns with different polarities, so that the heavy metal content reaches the GB21900-2008 standard. The process has the advantages of short flow, low cost, strong adaptability and easy operation and control; has better treatment effect on heavy metal ions such as nickel, zinc and the like with various contents and forms in the wastewater.
Description
Technical Field
The invention belongs to the field of methods for treating electroplating wastewater, and particularly relates to a method for treating zinc-nickel alloy electroplating wastewater.
Background
Alloy electroplating is a surface treatment technology which is rapidly developed in recent years, contains two or more than two metal coating layers, and has the characteristics of high hardness, high density, wear resistance, corrosion resistance, strong high temperature resistance, easy welding and attractive appearance compared with a single metal coating layer. The Zn-Ni alloy is widely applied for nearly 10 years, the corrosion resistance of the alloy coating is 7-10 times higher than that of the zinc coating, the appearance can be kept unchanged for 10 years, the hydrogen brittleness sensitivity is low, and the Zn-Ni alloy particularly shows excellent corrosion resistance in severe atmosphere and marine environment. The zinc and nickel have very different precipitation potentials due to their very different properties. In order to satisfy the stability and codeposition of zinc and nickel in the coating, a complexing agent and a coordination agent for adjusting the precipitation potential of two metal ions are generally required to be added, so that the equilibrium potential of the metal with the potential larger than that of the positive metal is shifted negatively, the equilibrium potential of the two metals with the potential difference is approximate, and the two metals are better codeposited.
The zinc-nickel alloy electroplating wastewater usually comes from the rinsing process and residual bath solution of plated parts, and according to detection, the alkaline zinc-nickel alloy plating solution mainly contains zinc ions, nickel ions, sodium hydroxide, triethanolamine, a nickel complexing agent and the like. Because the complexing agent is added, the metal ions exist in a complex form, and the requirement of the treatment standard is generally difficult to meet when the conventional alkali-adding precipitation mode is adopted to treat the wastewater. The prior treatment process of the zinc-nickel alloy electroplating wastewater generally adopts the steps of diluting with other water in large amount and then mixing and discharging, or adopts a heavy metal catching agent alone to treat and then mixing the treated water into comprehensive water for unified treatment.
At present, the treatment method of the wastewater mainly focuses on breaking complexation, destroying the complex structure of zinc and nickel in the wastewater, releasing zinc and nickel ions, and then precipitating by using a precipitator. The main decomplexation methods include oxidation, Fenton, electrocatalysis, ultraviolet method, etc. However, these methods have various problems, such as long time for complex breaking reaction, complicated operation, high treatment cost, difficulty in defining the end point of complex breaking reaction, etc., which also causes frequent fluctuation of the treatment result of wastewater and can not reach the standard stably.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the defects of the prior art, the invention provides a zinc-nickel alloy electroplating wastewater treatment method which has the advantages of short process flow, low cost, strong adaptability and easy operation and control, and the method comprises the following steps:
the invention aims to provide a method for treating zinc-nickel alloy electroplating wastewater, which has the technical points that: the method for treating the zinc-nickel alloy electroplating wastewater comprises the following steps:
the method comprises the following steps: adjusting the pH value of the zinc-nickel alloy electroplating wastewater to 5-6, adding a sodium dimethyldithiocarbamate aqueous solution to react to obtain a mixture A, wherein the volume ratio of the sodium dimethyldithiocarbamate aqueous solution to the zinc-nickel alloy electroplating wastewater is (5-6): 100, respectively;
step two: sequentially adding a coagulant aid, a flocculating agent and an adsorbent into the mixture A obtained in the step one for treatment, and then separating the mixture A in a centrifuge at the rotating speed of 3000-4000rmp for 20-40min to obtain a supernatant A and a precipitate A;
step three: and (4) taking the supernatant A obtained in the step two, adjusting the pH of the supernatant A obtained in the step two to 6-7, adsorbing by using macroporous adsorption resin columns with different polarities, washing with water to remove impurities, collecting the treated zinc-nickel alloy electroplating wastewater, and discharging after the detection reaches the standard.
In some embodiments of the present invention, the mass concentration of the sodium dimethyldithiocarbamate aqueous solution in the first step of the method for treating zinc-nickel alloy electroplating wastewater is 70-100 g/L.
In some embodiments of the present invention, the coagulant aid in step two of the method for treating zinc-nickel alloy electroplating wastewater is at least one of polyacrylamide and polydimethyldiallylammonium chloride.
In some embodiments of the present invention, the flocculant in step two of the method for treating wastewater from zinc-nickel alloy electroplating is at least one of an iron-based flocculant and an aluminum-based flocculant.
In some embodiments of the present invention, the above-mentioned iron-based flocculant is at least one of ferric chloride, ferric sulfate, polymeric ferric chloride and polymeric ferric sulfate.
In some embodiments of the present invention, the above-mentioned aluminum-based flocculant is at least one of aluminum chloride, aluminum sulfate, polyaluminum chloride and polyaluminum sulfate.
In some embodiments of the present invention, in the second step of the method for treating wastewater from zinc-nickel alloy electroplating, the adsorbent is at least one of powdered activated carbon and diatomite.
In some embodiments of the present invention, in the third step of the method for treating zinc-nickel alloy electroplating wastewater, the macroporous resin is at least one of a non-polar resin, a weakly polar resin and a polar resin.
Compared with the prior art, the invention has the beneficial effects that:
the method comprises the steps of firstly adjusting the pH value of the zinc-nickel alloy electroplating wastewater, then adopting a sodium dimethyldithiocarbamate aqueous solution for treatment, enabling zinc and nickel in the zinc-nickel alloy electroplating wastewater to form precipitates, then sequentially adding a coagulant aid, a flocculating agent and an adsorbent into the obtained mixed liquid for treatment, and adsorbing the separated supernatant by using macroporous adsorption resin columns with different polarities to enable the heavy metal content to reach the GB21900-2008 standard. The process has the advantages of short flow, low cost, strong adaptability and easy operation and control; has better treatment effect on heavy metal ions such as nickel, zinc and the like with various contents and forms in the wastewater.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Example 1
A method for treating zinc-nickel alloy electroplating wastewater comprises the following steps:
the method comprises the following steps: adjusting the pH value of the zinc-nickel alloy electroplating wastewater to 5.5, adding a sodium dimethyldithiocarbamate aqueous solution to react to obtain a mixture A, wherein the volume ratio of the sodium dimethyldithiocarbamate aqueous solution to the zinc-nickel alloy electroplating wastewater is 5.5: 100, respectively;
step two: sequentially adding a coagulant aid, a flocculating agent and an adsorbent into the mixture A obtained in the step one for treatment, and then separating the mixture A in a centrifuge at the rotating speed of 3500rmp for 30min to obtain a supernatant A and a precipitate A;
step three: and (4) taking the supernatant A obtained in the step two, adjusting the pH of the supernatant A obtained in the step two to 6.5, adsorbing by using macroporous adsorption resin columns with different polarities, washing with water to remove impurities, collecting the treated zinc-nickel alloy electroplating wastewater, and discharging after the detection reaches the standard.
The mass concentration of the sodium dimethyldithiocarbamate aqueous solution in the first step of the method for treating the zinc-nickel alloy electroplating wastewater is 85 g/L.
The coagulant aid in the second step of the method for treating the zinc-nickel alloy electroplating wastewater is polyacrylamide.
The flocculating agent in the second step of the method for treating the zinc-nickel alloy electroplating wastewater is an iron-based flocculating agent.
The above-mentioned iron-based flocculant is ferric chloride.
In the second step of the method for treating the zinc-nickel alloy electroplating wastewater, the adsorbent is powdered activated carbon.
In the third step of the method for treating the zinc-nickel alloy electroplating wastewater, the macroporous resin is nonpolar resin.
The concentration of zinc in the zinc-nickel alloy electroplating wastewater treated in the embodiment is detected to be 0.15mg/L, the concentration of nickel is detected to be 0.04mg/L, and the effluent is stable.
Example 2
A method for treating zinc-nickel alloy electroplating wastewater comprises the following steps:
the method comprises the following steps: adjusting the pH value of the zinc-nickel alloy electroplating wastewater to 5, adding a sodium dimethyldithiocarbamate aqueous solution to react to obtain a mixture A, wherein the volume ratio of the sodium dimethyldithiocarbamate aqueous solution to the zinc-nickel alloy electroplating wastewater is 5: 100, respectively;
step two: sequentially adding a coagulant aid, a flocculating agent and an adsorbent into the mixture A obtained in the step one for treatment, and then separating the mixture A in a centrifuge at the rotating speed of 3000rmp for 40min to obtain supernatant A and precipitate A;
step three: and (4) taking the supernatant A obtained in the step two, adjusting the pH of the supernatant A obtained in the step two to 6, adsorbing by using macroporous adsorption resin columns with different polarities, washing with water to remove impurities, collecting the treated zinc-nickel alloy electroplating wastewater, and discharging after the detection reaches the standard.
The mass concentration of the sodium dimethyldithiocarbamate aqueous solution in the first step of the method for treating the zinc-nickel alloy electroplating wastewater is 70 g/L.
The coagulant aid in the second step of the method for treating the zinc-nickel alloy electroplating wastewater is poly dimethyl diallyl ammonium chloride.
The flocculating agent in the second step of the method for treating the zinc-nickel alloy electroplating wastewater is an aluminum flocculating agent.
The aluminum flocculant is aluminum chloride.
In the second step of the method for treating the zinc-nickel alloy electroplating wastewater, the adsorbent is diatomite.
In the third step of the method for treating the zinc-nickel alloy electroplating wastewater, the macroporous resin is weak-polarity resin.
The concentration of zinc in the zinc-nickel alloy electroplating wastewater treated in the embodiment is detected to be 0.2mg/L, the concentration of nickel is detected to be 0.05mg/L, and the effluent is stable.
Example 3
A method for treating zinc-nickel alloy electroplating wastewater comprises the following steps:
the method comprises the following steps: adjusting the pH value of the zinc-nickel alloy electroplating wastewater to 6, adding a sodium dimethyldithiocarbamate aqueous solution to react to obtain a mixture A, wherein the volume ratio of the sodium dimethyldithiocarbamate aqueous solution to the zinc-nickel alloy electroplating wastewater is 6: 100, respectively;
step two: sequentially adding a coagulant aid, a flocculating agent and an adsorbent into the mixture A obtained in the step one for treatment, and then separating the mixture A in a centrifuge at the rotating speed of 4000rmp for 20min to obtain supernatant A and precipitate A;
step three: and (4) taking the supernatant A obtained in the step two, adjusting the pH of the supernatant A obtained in the step two to 7, adsorbing by using macroporous adsorption resin columns with different polarities, washing with water to remove impurities, collecting the treated zinc-nickel alloy electroplating wastewater, and discharging after the detection reaches the standard.
The mass concentration of the sodium dimethyldithiocarbamate aqueous solution in the first step of the method for treating the zinc-nickel alloy electroplating wastewater is 100 g/L.
The coagulant aid in the second step of the method for treating the zinc-nickel alloy electroplating wastewater is a mixture of polyacrylamide and poly-dimethyldiallylammonium chloride, wherein the weight ratio of the polyacrylamide to the poly-dimethyldiallylammonium chloride is 1: 1.
the flocculant in the second step of the method for treating the zinc-nickel alloy electroplating wastewater is a mixture of an iron-based flocculant and an aluminum-based flocculant, wherein the weight ratio of the iron-based flocculant to the aluminum-based flocculant is 1: 1.
the iron-based flocculant is ferric sulfate.
The aluminum flocculant is aluminum sulfate.
In the second step of the method for treating the zinc-nickel alloy electroplating wastewater, the adsorbent is a mixture of powdered activated carbon and diatomite, wherein the weight ratio of the powdered activated carbon to the diatomite is 1: 1.
in the third step of the method for treating the zinc-nickel alloy electroplating wastewater, the macroporous resin is polar resin.
The concentration of zinc in the zinc-nickel alloy electroplating wastewater treated in the embodiment is detected to be 0.1mg/L, the concentration of nickel is detected to be 0.03mg/L, and the effluent is stable.
Example 4
A method for treating zinc-nickel alloy electroplating wastewater comprises the following steps:
the method comprises the following steps: adjusting the pH value of the zinc-nickel alloy electroplating wastewater to 5.2, adding a sodium dimethyldithiocarbamate aqueous solution to react to obtain a mixture A, wherein the volume ratio of the sodium dimethyldithiocarbamate aqueous solution to the zinc-nickel alloy electroplating wastewater is 5.8: 100, respectively;
step two: sequentially adding a coagulant aid, a flocculating agent and an adsorbent into the mixture A obtained in the step one for treatment, and then separating the mixture A in a centrifuge at a rotating speed of 3800rmp for 25min to obtain a supernatant A and a precipitate A;
step three: and (4) taking the supernatant A obtained in the step two, adjusting the pH of the supernatant A obtained in the step two to 6.3, adsorbing by using macroporous adsorption resin columns with different polarities, washing with water to remove impurities, collecting the treated zinc-nickel alloy electroplating wastewater, and discharging after the detection reaches the standard.
The mass concentration of the sodium dimethyldithiocarbamate aqueous solution in the first step of the method for treating the zinc-nickel alloy electroplating wastewater is 80 g/L.
The coagulant aid in the second step of the method for treating the zinc-nickel alloy electroplating wastewater is polyacrylamide.
The aluminum flocculant in the second step of the method for treating the zinc-nickel alloy electroplating wastewater.
The aluminum flocculant is a mixture of polyaluminium chloride and polyaluminium sulfate, wherein the weight ratio of the polyaluminium chloride to the polyaluminium sulfate is 1: 1.
in the second step of the method for treating the zinc-nickel alloy electroplating wastewater, the adsorbent is diatomite.
In the third step of the method for treating the zinc-nickel alloy electroplating wastewater, the macroporous resin is nonpolar resin.
The concentration of zinc in the zinc-nickel alloy electroplating wastewater treated in the embodiment is detected to be 0.12mg/L, the concentration of nickel is detected to be 0.037mg/L, and the effluent is stable.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A method for treating zinc-nickel alloy electroplating wastewater is characterized by comprising the following steps: the method for treating the zinc-nickel alloy electroplating wastewater comprises the following steps:
the method comprises the following steps: adjusting the pH value of the zinc-nickel alloy electroplating wastewater to 5-6, adding a sodium dimethyldithiocarbamate aqueous solution to react to obtain a mixture A, wherein the volume ratio of the sodium dimethyldithiocarbamate aqueous solution to the zinc-nickel alloy electroplating wastewater is (5-6): 100, respectively;
step two: sequentially adding a coagulant aid, a flocculating agent and an adsorbent into the mixture A obtained in the step one for treatment, and then separating the mixture A in a centrifuge at the rotating speed of 3000-4000rmp for 20-40min to obtain a supernatant A and a precipitate A;
step three: and (4) taking the supernatant A obtained in the step two, adjusting the pH of the supernatant A obtained in the step two to 6-7, adsorbing by using macroporous adsorption resin columns with different polarities, washing with water to remove impurities, collecting the treated zinc-nickel alloy electroplating wastewater, and discharging after the detection reaches the standard.
2. The method for treating zinc-nickel alloy electroplating wastewater according to claim 1, wherein the method comprises the following steps: the mass concentration of the sodium dimethyldithiocarbamate aqueous solution in the first step is 70-100 g/L.
3. The method for treating zinc-nickel alloy electroplating wastewater according to claim 1, wherein the method comprises the following steps: and the coagulant aid in the second step is at least one of polyacrylamide and polydimethyldiallylammonium chloride.
4. The method for treating zinc-nickel alloy electroplating wastewater according to claim 1, wherein the method comprises the following steps: and the flocculating agent in the second step is at least one of an iron flocculating agent and an aluminum flocculating agent.
5. The method for treating wastewater from zinc-nickel alloy electroplating according to claim 4, wherein the method comprises the following steps: the iron-based flocculant is at least one of ferric chloride, ferric sulfate, polymeric ferric chloride and polymeric ferric sulfate.
6. The method for treating wastewater from zinc-nickel alloy electroplating according to claim 4, wherein the method comprises the following steps: the aluminum flocculant is at least one of aluminum chloride, aluminum sulfate, polyaluminum chloride and polyaluminum sulfate.
7. The method for treating zinc-nickel alloy electroplating wastewater according to claim 1, wherein the method comprises the following steps: and in the second step, the adsorbent is at least one of powdered activated carbon and diatomite.
8. The method for treating zinc-nickel alloy electroplating wastewater according to claim 1, wherein the method comprises the following steps: and in the third step, the macroporous resin is at least one of non-polar resin, weak-polar resin and polar resin.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114735842A (en) * | 2022-03-07 | 2022-07-12 | 金川集团股份有限公司 | Method for removing heavy metals from ammonia-containing wastewater |
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| CN104961273A (en) * | 2015-06-16 | 2015-10-07 | 广州超邦化工有限公司 | Method for treating alkaline zinc-nickel alloy electroplating wastewater |
| CN110510768A (en) * | 2018-05-21 | 2019-11-29 | 广州超邦化工有限公司 | The combination treatment method of chemical nickle-plating wastewater |
| CN110980866A (en) * | 2019-12-27 | 2020-04-10 | 苏州博睿特环保科技有限公司 | Method for deeply removing zinc-nickel alloy electroplating wastewater |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104961273A (en) * | 2015-06-16 | 2015-10-07 | 广州超邦化工有限公司 | Method for treating alkaline zinc-nickel alloy electroplating wastewater |
| CN110510768A (en) * | 2018-05-21 | 2019-11-29 | 广州超邦化工有限公司 | The combination treatment method of chemical nickle-plating wastewater |
| CN110980866A (en) * | 2019-12-27 | 2020-04-10 | 苏州博睿特环保科技有限公司 | Method for deeply removing zinc-nickel alloy electroplating wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114735842A (en) * | 2022-03-07 | 2022-07-12 | 金川集团股份有限公司 | Method for removing heavy metals from ammonia-containing wastewater |
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