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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  • Description
  • Claims
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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

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  • Electroplating wastewater treatment method

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[0019] Example 1

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

[0021] A method for treating electroplating wastewater includes the following steps:

[0022] 1) Pass the collected electroplating wastewater (leaching wastewater) into the nanofiltration membrane module 1 for treatment. After 10 times of concentration, the permeate and concentrate are obtained. The permeate is reused as the leaching water in the electroplating process and concentrated. The liquid is passed into the chemical precipitation tank 3;

[0023] The main pollutant concentration of the concentrate is: copper 500mg / L, total phosphorus 2000mg / L;

[0024] 2) Add the chemical precipitation agent calcium hydroxide to the chemical precipitation tank 3, stir at 150r / min for 20 minutes to precipitate heavy metal ions in the electroplat...

Example Embodiment

[0028] Example 2

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

[0030] A method for treating electroplating wastewater includes the following steps:

[0031] 1) Pass the electroplating wastewater into the reverse osmosis membrane module 1 for treatment. After 10 times of concentration, the permeate and the concentrate are obtained. 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 precipitation agent sodium hydroxide to the chemical precipitation tank 3, make the pH = 11, stir at 100r / min for 18 minutes, and precipitate the heavy metal ions in the electroplating wastewater; (operating for a period of time, there is precipitation in the c...

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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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