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Method for treating electroless nickel plating wastewater based on ozone oxidation and biochemical technology

A technology of chemical nickel plating and technical treatment, applied in chemical instruments and methods, oxidized water/sewage treatment, aerobic and anaerobic process treatment, etc., can solve the problem of total nitrogen not up to standard, and achieve the effect of high disposal cost

Active Publication Date: 2018-06-12
CHINA NORTH ENERGY CONSERVATION & ENVIRONMENT PROTECTION
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for treating electroless nickel plating wastewater based on ozone oxidation and biochemical technology in order to solve the problem that the total nitrogen in the existing treatment technology is not up to standard

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  • Method for treating electroless nickel plating wastewater based on ozone oxidation and biochemical technology
  • Method for treating electroless nickel plating wastewater based on ozone oxidation and biochemical technology

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Embodiment 1

[0024] The method of treating electroless nickel plating wastewater based on ozone oxidation and biochemical technology, the wastewater quality is: total nickel = 60-100mg / L, total copper = 5-10mg / L, total phosphorus = 40-80mg / L, total nitrogen = 50- 60mg / L, total iron=5~12mg / L, COD=500~600mg / L, ammonia nitrogen=30~40mg / L, pH=4~5.

[0025] The electroless nickel plating wastewater enters the wastewater regulating tank, and is oxidized with ozone for 40 minutes to oxidize and destroy part of the complexing agent that forms a coordination with nickel, and simultaneously oxidize hypophosphite and phosphite to orthophosphate, and use a small amount of dilute sodium hydroxide for ozone effluent Adjust the pH of the wastewater to 8.5-9, and enter a settling tank to precipitate nickel hydroxide. The effluent from the first settling tank enters the anoxic biochemical tank with a hydraulic retention time of 8 hours. Under the action of facultative bacteria, the chain breaks to degrade ...

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Abstract

The invention relates to a method for treating chemical nickel plating waste water on the basis of ozonation and biochemical technique, and belongs to the field of environment protection. Through ozone pre-oxidation, microbe inhibiting phosphiteis are converted into orthophosphate before the biochemical treatment; meanwhile, ozone can oxidize partial complex compounds; nickel after the complexation relieving becomes free nickel ions; 80 percent or more metallic nickel is precipitated through a primary precipitation pool; the outlet water total nickel of the primary precipitation pool is less than 20mg / L; anaerobic and aerobic microbes can adapt to the environment through domestication; through an aerobic biochemical technology, ammonia nitrogen is converted into trate nitrogen; then, outlet water of an aerobic pool flows back to an anaerobic pool; the heterotrophic nutrition denitrification denitrification is realized; meanwhile, the biological effect is used; organic matters in waste water are thoroughly removed, so that the nickel in the complexation state becomes free nickel ions; then, the metallic nickel can be thoroughly removed by using the good adsorption and flocculation performing of the active sludge. The method has the advantage that the total nitrogen in the treated waste water conforms to national emission standards.

Description

technical field [0001] The invention relates to a method for treating chemical nickel plating wastewater based on ozone oxidation and biochemical technology, and belongs to the field of environmental protection. Background technique [0002] The electroless nickel plating bath contains metal nickel complexes, and the substances that form coordination with nickel are a large amount of organic acids, such as citric acid and malic acid, and also contain a large amount of reducing substances such as hypophosphite and phosphite. The stability of the plating solution and the quality of the product are also added with organic substances such as buffers and brighteners. A large amount of inorganic salts such as nickel sulfate and nickel chloride are used in the bath configuration process, so the electroless nickel rinsing wastewater contains heavy metals and a large amount of organic substances. brackish water. Traditional electroless nickel plating wastewater usually adopts the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/16C02F101/20
CPCC02F1/5236C02F1/66C02F1/78C02F3/30C02F9/00C02F2001/007C02F2101/20C02F2103/16C02F2209/06C02F2209/08C02F2209/14C02F2209/16
Inventor 袁从艳武春艳曲凌云陈苏燕姜鑫谷振华王新陈琳子
Owner CHINA NORTH ENERGY CONSERVATION & ENVIRONMENT PROTECTION
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