Method for treating low-concentration wastewater containing strong complex nickel

A treatment method and technology for nickel wastewater, which is applied in special compound water treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of low wastewater reuse rate, insufficient network breaking, and failure of total nickel in effluent to meet discharge standards, etc. problems, to achieve high water production rate, low conductivity, improve pertinence and reaction efficiency

Inactive Publication Date: 2018-12-18
CHINA ELECTRONICS INNOVATION ENVIRONMENTAL TECH CO LTD +1
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Problems solved by technology

[0006] Purpose of the invention: The present invention provides a treatment method for low-concentration and strongly complexed nickel-containing wastewater to solve the problems in the prior art such as low wastewater reuse rate, insufficient network breaking, and failure of the total nickel in the effluent to reach the discharge standard, etc.

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  • Method for treating low-concentration wastewater containing strong complex nickel

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Embodiment 1

[0031] The nickel-containing wastewater is: the influent water volume is 8m 3 / h, the content of COD is 50-100mg / L, the content of total nickel is 3-8mg / L, the content of EDTA is 2-4mg / L, the content of ammonia nitrogen is 50-150mg / L, and the conductivity is less than 500μs / cm.

[0032] The treatment steps of the low-concentration strong complexed nickel wastewater of the present embodiment are as follows:

[0033] In the first step, the above-mentioned low-concentration strongly complexed nickel wastewater is pretreated sequentially through a multi-media filter and an activated carbon filter, and then the pH is adjusted to 7 and concentrated by RO with a recovery rate of 75% to obtain a concentrated solution.

[0034] In the second step, adjust the pH of the concentrated solution obtained in the first step to 3, pass through the iron-carbon micro-electrolytic cell, aerate and make the wastewater stay for 30 minutes. Add 2.5L / h of H 2 o 2 (30wt.%) and 33L / h of FeSO 4 (10wt...

Embodiment 2

[0040] Low-concentration strong-complexed nickel wastewater is: the influent water volume is 10m 3 / h, the content of COD is 40~100mg / L, the content of total nickel is 6~20mg / L, the content of EDTA is 5~15mg / L, the content of ammonia nitrogen is 250~500mg / L, and the conductivity is less than 600μs / cm.

[0041] The treatment steps of the low-concentration strong complexed nickel wastewater of the present embodiment are as follows:

[0042] In the first step, the above-mentioned low-concentration strongly complexed nickel wastewater is pretreated through a multi-media filter and an activated carbon filter in sequence, and then the pH is adjusted to 6.5 and concentrated by RO to obtain a concentrated solution.

[0043] In the second step, adjust the pH of the concentrated solution obtained in the first step to be 2, pass through the iron-carbon micro-electrolytic cell, aerate and make the wastewater stay for 60 minutes. Add 3L / h of H 2 o 2 (30wt.%) and 4.2L / h of FeSO 4 (10wt....

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Abstract

The invention discloses a method for treating low-concentration wastewater containing strong complex nickel. Firstly, the pH of the nickel-containing wastewater is adjusted to be neutral, and after being pretreated by a multi-media filter and an activated carbon filter, the nickel-containing wastewater is processed in a reverse osmosis system; after adjusting of the pH of concentrated water treated by the reverse osmosis system, iron-carbon microelectrolysis and Fenton reaction are sequentially performed; an oxidizing agent is added to effluent after the Fenton reaction; a reducing agent is added into the effluent after the oxidation; the effluent after the reduction reaction is added with an alkali and then precipitated; after adjusting of the pH of supernatant obtained after the precipitation, the supernatant is adsorbed by selective chelate ion exchange resin and discharged. The method improves the pertinence and reaction efficiency of subsequent complexing destructive measures; thewater production rate is high, and the membrane pollution degree is low; the total nickel content of the final effluent can stably reach a level less than 0.1 mg/L; and the operating cost is low.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a treatment method for low-concentration waste water containing strong complexed nickel produced in the semiconductor industry. Background technique [0002] The nickel plating process in the semiconductor production process will produce a large amount of nickel-containing wastewater. Different from the wastewater in the traditional electroplating industry, the nickel-containing wastewater in the semiconductor industry has some unique characteristics: large amount of wastewater, low total nickel concentration but a large proportion of EDTA complexed nickel, low conductivity of wastewater, and high concentration of ammonia nitrogen. The traditional nickel-containing wastewater treatment methods are not completely suitable for the treatment and reuse of the wastewater. For example, physical and chemical precipitation, ion exchange, and adsorption methods c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/20
CPCC02F1/001C02F1/283C02F1/42C02F1/441C02F1/46176C02F1/52C02F1/66C02F1/70C02F1/722C02F1/76C02F9/00C02F2101/20C02F2301/08C02F2305/026
Inventor 蔡宏展熊江磊丁凯耘陆晟星
Owner CHINA ELECTRONICS INNOVATION ENVIRONMENTAL TECH CO LTD
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