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Electroplating wastewater treatment method

A technology of electroplating wastewater and treatment methods, which is applied in metallurgical wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of large area occupied by electroplating leaching wastewater, long settling time, and large amount of waste residue, etc., to achieve Reduce the amount of wastewater, improve treatment efficiency, and reduce costs

Inactive Publication Date: 2020-02-21
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a treatment method for electroplating wastewater to solve the existing problems of the prior art, such as large floor area, high cost, long settling time, large amount of waste residue, and low efficiency. And other issues

Method used

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  • Electroplating wastewater treatment method

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Embodiment 1

[0020] Taking pyrophosphate copper plating leaching wastewater discharged from an electroplating factory as the treatment object, the main pollutant concentrations in the wastewater are: copper 50mg / L, total phosphorus 200mg / L.

[0021] A treatment method for electroplating wastewater, comprising the steps of:

[0022] 1) Pass the collected electroplating wastewater (leaching wastewater) into the nanofiltration membrane module 1 for treatment, and after concentrating 10 times, obtain the permeate and concentrated solution, and reuse the permeate as the rinsing water in the electroplating process, concentrate The liquid passes into the chemical sedimentation tank 3;

[0023] Concentration of main pollutants in concentrated solution: copper 500mg / L, total phosphorus 2000mg / L;

[0024] 2) Add the chemical precipitant calcium hydroxide to the chemical precipitation tank 3, and stir at 150r / min for 20 minutes to precipitate the heavy metal ions in the electroplating wastewater; (r...

Embodiment 2

[0029] Taking the nickel plating wastewater discharged from an electroplating factory as the treatment object, the concentration of the main pollutants in the wastewater is: nickel 60mg / L.

[0030] A treatment method for electroplating wastewater, comprising the steps of:

[0031] 1) The electroplating waste water is passed into the reverse osmosis membrane module 1 for treatment, and after being concentrated 10 times, the permeate and the concentrate are obtained, and the permeate is reused as rinsing water in the electroplating process, and the concentrate flows into the chemical precipitation tank 3; The main pollutant concentration of electroplating wastewater after concentration is: nickel 600mg / L;

[0032] 2) Add the chemical precipitant sodium hydroxide to the chemical precipitation tank 3 to make pH=11, stir at 100r / min for 18min, and precipitate the heavy metal ions in the electroplating wastewater; remove);

[0033] 3) The liquid obtained in step 2) is passed into ...

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Abstract

The invention discloses an electroplating wastewater treatment method and the method comprises the following steps: 1) introducing electroplating wastewater into a nanofiltration membrane assembly ora reverse osmosis membrane assembly for treatment to obtain a permeate and a concentrated solution, recycling the permeate, and introducing the concentrated solution into a chemical precipitation container; 2) adding a chemical precipitant into the chemical precipitation container, and stirring to precipitate heavy metal ions in the electroplating wastewater; 3) introducing the liquid obtained inthe step 2) into an ultrafiltration membrane component, and performing ultrafiltration to obtain ultrafiltration permeate liquid and ultrafiltration concentrated liquid; and returning the ultrafiltration concentrated liquid to the chemical precipitation container, introducing the ultrafiltration permeate liquid into a pH regulating tank, regulating to be neutral to obtain effluent, and dischargingthe effluent after the detection result reaches the standard. The method provided by the invention can greatly reduce the amount of wastewater and reduce the cost, and the occupied area of a treatment device is small. Chemical precipitation is used as ultrafiltration membrane pretreatment operation, and the problem that by an ultrafiltration membrane, heavy metals in the electroplating wastewaterare difficult to intercept is effectively solved. The effluent meets discharge standard.

Description

technical field [0001] The invention relates to the technical field of electroplating wastewater treatment, in particular to a method for treating electroplating wastewater. Background technique [0002] As a common pollutant, heavy metals have the characteristics of non-degradation, high stability and easy accumulation, and are a class of pollutants with major hazards. With the development of my country's electroplating industry, the electroplating wastewater produced contains a large amount of heavy metals, which will cause damage to water bodies, soil and even the entire ecological environment if discharged into the environment. At present, the electroplating wastewater mainly comes from the leaching wastewater produced by the electroplating process. Because of its large water volume and low concentration, large processing equipment is often required during the treatment process, which occupies a large area and costs high. [0003] Among the commonly used electroplating ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16C02F101/20
CPCC02F1/441C02F1/442C02F1/444C02F1/62C02F1/66C02F9/00C02F2101/20C02F2103/16C02F2209/06C02F2301/046
Inventor 张宇峰冉子寒常高峰张文娟王坚坚
Owner TIANJIN CHENGJIAN UNIV
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