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A method for treating electroplating wastewater

A technology for electroplating wastewater and wastewater, applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of high operating costs, large area, secondary pollution, etc. The effect of land area, reduction of industrial COD and cost saving

Inactive Publication Date: 2016-04-06
SHENZHEN QIPEI IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Physical and chemical methods mainly include air flotation method, ion exchange method, extraction method, activated carbon adsorption method, electrolysis method, etc. The first three methods have the problems of large floor area, high operation cost and secondary pollution

Method used

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  • A method for treating electroplating wastewater

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Effect test

Embodiment 1

[0022] A method for treating electroplating wastewater, comprising the steps of:

[0023] 1) The electroplating wastewater passes through the grid to remove large solid matter, and then the wastewater is discharged into the sedimentation tank and left to stand for 24 hours. The bottom filler of the sedimentation tank is river sand with a thickness of 100cm, and the particle size of the river sand is 1mm. Preliminary adsorption and precipitation of metal debris and colloidal flocs can be carried out;

[0024] 2) Discharge the wastewater into the complexing tank, add complexing agent according to the ratio of 1 kg complexing agent: 1 ton of wastewater, then stir at 200 rpm for 30 minutes, and then let it stand for 6 hours; among them, the complexing agent It is prepared according to the following method: according to the mass ratio of 1:1:2:4:5, aluminum oxide, potassium humate, diatomaceous earth, ferrous sulfate, polysilicate iron (PSF, Si / Fe molar ratio is 1 ), mixed and sti...

Embodiment 2

[0029] A method for treating electroplating wastewater, comprising the steps of:

[0030] 1) The electroplating wastewater passes through the grid to remove large solid matter, and then the wastewater is discharged into the sedimentation tank and left to stand for 24-48 hours. The bottom filler of the sedimentation tank is river sand with a thickness of 100cm, and the particle size of the river sand is 2mm, for preliminary adsorption and precipitation of metal debris and colloidal flocs;

[0031] 2) Discharge the wastewater into the complexing tank, add complexing agent according to the ratio of 1 kg complexing agent: 1 ton of wastewater, then stir at 300 rpm for 60 minutes, and then let it stand for 8 hours; among them, the complexing agent It is prepared according to the following method: according to the mass ratio of 1:1:2:4:5, aluminum oxide, potassium humate, diatomaceous earth, ferrous sulfate, polysilicate iron (PSF, Si / Fe molar ratio is 0.5 ), mixed and stirred;

[...

Embodiment 3

[0041] The effect of the bacterial fertilizer prepared by Example 1 or 2 of the present invention on strawberry yield and quality. The experimental variety is Fengxiang. Both Example 1 and 2 applied 100 kg / mu of bacterial fertilizer prepared by the present invention, and 100 kg / mu of commercially available Shandong Luzhuang bio-organic fertilizer was used in the comparative example, and conventional cultivation was carried out in protected land. The results are shown in Table 1. Compared with the commercially available bio-organic fertilizer, this product can increase the sugar content of strawberries, improve the color and increase the yield.

[0042] Table 2 The impact of this product on strawberry quality and yield

[0043]

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Abstract

The invention belongs to the field of wastewater treatment, and discloses a method for treating electroplating wastewater. By using the heavy metal complexing agent and composite microbial inoculant, the method greatly lowers the contents of heavy metals and industrial COD (chemical oxygen demand), and utilizes the waste bacteria to prepare the bacterial fertilizer, thereby achieving two goals and changing wastes into valuable substances.

Description

technical field [0001] The invention belongs to the field of wastewater treatment and discloses a method for treating electroplating wastewater. Background technique [0002] Electroplating wastewater refers to the wastewater and waste liquid discharged from the electroplating factory (or workshop), such as rinsing water for plating parts, waste bath liquid, equipment cooling water and flushing ground water. Contains nickel or cadmium, cyanide, acid, alkali, etc. Some metal ions in wastewater exist in the form of simple cations (such as Ni2+, Cu2+, etc.), some exist in the form of acid radical anions, and some exist in the form of complex complex anions. One type of wastewater often contains more than one harmful component, such as cyanide and cadmium in cadmium plating wastewater. In addition, the general plating solution often contains organic additives. Electroplating wastewater treatment equipment consists of regulating tank, dosing tank, reduction tank, neutralizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/16
Inventor 孙伟赵朋朋张晓陈彦杰李守春王力
Owner SHENZHEN QIPEI IND CO LTD
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