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Method for removing phosphorus and nickel in electroless nickel-plating wastewater and treatment system

An electroless nickel plating and waste water technology, which is applied in chemical instruments and methods, metallurgical waste water treatment, special compound water treatment, etc., can solve the problems of continuously and effectively meeting discharge standards, and achieve the effect of recycling and recycling

Pending Publication Date: 2017-05-24
深圳市世清环保科技有限公司
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Problems solved by technology

Therefore, for the treatment of phosphorus in electroless nickel plating wastewater, the conventional single method cannot continuously and effectively meet the discharge standards

Method used

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  • Method for removing phosphorus and nickel in electroless nickel-plating wastewater and treatment system
  • Method for removing phosphorus and nickel in electroless nickel-plating wastewater and treatment system
  • Method for removing phosphorus and nickel in electroless nickel-plating wastewater and treatment system

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Embodiment Construction

[0039] The method for removing phosphorus and nickel in the electroless nickel-plating wastewater of the present invention adopts the following steps to treat the total phosphorus concentration at 150mg / L-3000mg / L and the nickel concentration at 45mg / L-700mg / L nickel-plating wastewater until the total phosphorus concentration is Standard effluent with less than 0.5ppm and nickel concentration less than 0.1ppm:

[0040] Such as figure 1 As shown, in step 1, the nickel-plating wastewater is discharged into the 1# regulating tank and its pH value is adjusted to between 5-6. When it is in the weak acid state, it is difficult for the wastewater to produce cathodic hydrogen evolution during three-dimensional electrolysis. Phenomenon. Namely: when the pH value of the wastewater is too low, during three-dimensional electrolytic treatment, the cathodic hydrogen evolution reaction is serious, and the iron-carbon filler is consumed too quickly, which is not conducive to improving the ox...

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Abstract

The invention discloses a method for completely removing phosphorus and nickel in electroless nickel-plating wastewater with advantages of low energy consumption and capacity of avoiding secondary pollution and an adopted treatment system. The nickel-plating wastewater with total phosphorus concentration of 3000mg / L and nickel concentration of 700mg / L is treated into effluent of reaching the standard with the total phosphorus concentration of less than 0.5ppm and nickel concentration of less than 0.1ppm. According to a three-dimensional electrolytic technology, hypophosphorous acid and phosphorous acid in the electroless nickel-plating wastewater can be oxidized into orthophosphoric acid, and nickel ions in a complex state are released. Due to dual oxidation and multiple mixed sludge precipitation reactions, the hypophosphorous acid and phosphorous acid can be further oxidized, the nickel ions in a free state are precipitated, finally the residual nickel ions in the wastewater are completely removed by an ion exchange column, and the effluent reaches the emission standard. Therefore, the pollutants in the electroless nickel-plating wastewater can be totally controlled, the national emission standard is continuously and stably reached, the treated sludge containing nickel and phosphorus is subjected to after-treatment, and the nickel and phosphorus can be effectively recovered.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method for total phosphorus and nickel in electroless nickel plating wastewater and a treatment system adopted. Background technique [0002] Electroless nickel plating is a surface treatment technology that can effectively improve the corrosion resistance and wear resistance of workpieces, and has been widely used. However, the electroless nickel plating solution is unstable and has a short service life due to its own reduction reaction properties, and the waste liquid produced contains a large amount of hypophosphite, phosphite, sodium sulfate and some organic matter. At present, the eutrophication of water bodies is very serious. As the society pays more and more attention to water eutrophication and the country strengthens the control of water eutrophication, the control of phosphorus content in sewage discharge is becoming more and more strict. Therefore, simple ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/16
CPCC02F9/00C02F1/42C02F1/722C02F1/66C02F1/5236C02F1/461C02F1/4672C02F2305/026C02F2301/08C02F2001/007C02F2103/16
Inventor 吴志宇吴思国黎建平帅和平陈福明
Owner 深圳市世清环保科技有限公司
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