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Method for treating alkaline zinc-nickel alloy electroplating wastewater

A technology for electroplating wastewater and treatment method, which is applied in the fields of metallurgical wastewater treatment, water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of large oxidant consumption, limited treatment capacity, unstable effluent, etc., to improve economic benefits. , improve processing speed, reduce the effect of adverse effects

Pending Publication Date: 2021-03-02
淮安中顺环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional treatment process for zinc-nickel alloy electroplating wastewater is mainly divided into the following three types: (1) Dilution precipitation method: This method takes advantage of the large amount of other sewage in the factory area to dilute the high-concentration solution and then precipitate it. However, the treatment capacity Restricted by the amount of other wastewater in the plant area
(2) Chelating precipitation method: This method removes copper ions in wastewater by adding sulfide or polymer chelating agents. unstable
(3) Oxidation and decomplexation precipitation method: use oxidant to fully oxidize and break the complexing agent, and then adjust the solution to be alkaline to form hydroxide precipitation. However, in the case of high complexing agent content, a large amount of oxidizing agent needs to be consumed. The cost is higher and the process is more cumbersome
Yet described invention is not suitable for processing the alkaline electroplating waste water that contains more complexing agent such as EDTA

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present embodiment provides a kind of treatment method of alkaline zinc-nickel alloy electroplating wastewater, and described treatment method comprises the following steps:

[0044] (1) mixing concentration is 45wt% industrial grade sulfuric acid solution and electroplating waste water, adjusts the pH=2 of electroplating waste water, and the gained electroplating waste water is left standstill 20min;

[0045] (2) The electroplating wastewater obtained in step (1) is passed into the ion exchange with a height-to-diameter ratio of 3:1 at a flow rate of 10 times the volume / hour and filled with a strongly acidic cation exchange resin of the type 001×7 (732). The effluent is neutralized to pH=7 with sodium hydroxide solution and discharged after testing that the content of zinc ions and nickel ions reaches the standard; the ion exchange column is two columns connected in series, and the effluent of each column needs to be tested , when it is detected that the content of...

Embodiment 2

[0048] The present embodiment provides a kind of treatment method of alkaline zinc-nickel alloy electroplating wastewater, and described treatment method comprises the following steps:

[0049] (1) mixing industrial-grade sulfuric acid solution and electroplating wastewater with a concentration of 30 wt%, adjusting the pH of the electroplating wastewater to 2.5, and leaving the resulting electroplating wastewater for 30 minutes;

[0050] (2) The electroplating wastewater obtained in step (1) is passed into the ion exchange with a high-diameter ratio of 2.3:1 and filled with a strong acidic cation exchange resin of the 001×4 (734) model at a flow rate of 5 times volume / hour. column, the effluent is tested to reach the standard of zinc ion and nickel ion content, and then neutralized with sodium carbonate solution to pH=6.5 and discharged; the ion exchange column is three columns connected in series, and the effluent of each column needs to be tested. When it is detected that th...

Embodiment 3

[0053] The present embodiment provides a kind of treatment method of alkaline zinc-nickel alloy electroplating wastewater, and described treatment method comprises the following steps:

[0054] (1) mixing concentration is 60wt% industrial grade sulfuric acid solution and electroplating waste water, adjusts the pH=1 of electroplating waste water, and the gained electroplating waste water is left standstill 10min;

[0055] (2) Pass the electroplating wastewater obtained in step (1) into an ion exchange column with a height-to-diameter ratio of 3.5:1 at a flow rate of 15 times volume / hour and filled with a D001 model strong acid cation exchange resin, and the effluent is tested After the content of zinc ions and nickel ions reaches the standard, use sodium bicarbonate solution to neutralize to pH=7.5 and discharge; the ion exchange column is two columns connected in series, and the effluent of each column needs to be tested. When the content of zinc ions and / or nickel ions in the...

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Abstract

The invention provides a treatment method of alkaline zinc-nickel alloy electroplating wastewater, which comprises the following steps: (1) mixing an acid solution and electroplating wastewater, and regulating the pH value of the electroplating wastewater to be less than or equal to 2.5; and (2) removing zinc ions and nickel ions in the electroplating wastewater obtained in the step (1) by using an ion exchange method. According to the treatment method provided by the invention, the treatment process is simplified, the treatment speed is increased, the treatment cost is reduced, and the treatment method is particularly suitable for treating the electroplating wastewater rich in an EDTA complexing agent.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a treatment method for electroplating wastewater, in particular to a treatment method for alkaline zinc-nickel alloy electroplating wastewater. Background technique [0002] With the continuous expansion of the scale of the current domestic electroplating industry, the treatment volume and difficulty of electroplating wastewater are also gradually increasing. As one of the main sources of heavy metal wastewater, the environmental protection and harmless treatment of electroplating wastewater is a common problem that the electroplating industry needs to face. [0003] The traditional treatment process for zinc-nickel alloy electroplating wastewater is mainly divided into the following three types: (1) Dilution precipitation method: This method takes advantage of the large amount of other sewage in the factory area to dilute the high-concentration solution and then precipita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/00C02F103/16
CPCC02F1/42C02F1/5272C02F1/62C02F1/66C02F9/00C02F11/00C02F2103/16
Inventor 刘达标庄仓宏王凯顾冬生
Owner 淮安中顺环保科技有限公司
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