Industrial plating wastewater treatment process

A technology for electroplating wastewater and treatment process, which is applied in metallurgical wastewater treatment, multi-stage water treatment, water/sewage treatment and other directions, and can solve the problems of high operating cost, inability to remove toxic and harmful substances, and large investment.

Inactive Publication Date: 2016-09-28
JIANGSU SERO ANTICORROSION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the complex is not reduced, it is useless to use more chemicals, and the toxic and harmful substances cannot be removed by precipitation, so it can only be diluted and discharged with a large amount of clean water, resulting in a waste of water resources
The process of sedimentation, filtration, adsorption and membrane separation and other methods of treatment has different degrees of large investment and high operating costs, and the treated water is difficult to meet the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 1 liter of electroplating wastewater, it is measured that the heavy metal copper contained in 1 liter of electroplating wastewater is 5g, nickel is 8g, hexavalent chromium is 10g, and contains 25g of highly toxic substances such as cyanide, and the pH value is 6;

[0029] 1) at first add the ferric sulfate of 0.1g and the ferric trichloride of 0.1g in 1L of electroplating wastewater to be treated, the pH value of electroplating wastewater is adjusted to 3;

[0030] 2) Add 1g of hydrogen peroxide, 2g of sodium metabisulfite and 0.1g / of bactericide to the electroplating wastewater after adjusting the pH, stir evenly, reduce the complex with hydrogen bonds through the reaction, and absorb heavy metals through the bactericide. Under the action of standing for precipitation for 20 minutes;

[0031] 3) Then in the treated electroplating wastewater, add 1g of flake caustic soda (also called sodium hydroxide, caustic soda, caustic soda, caustic soda) and 1g of quicklime t...

Embodiment 2

[0038] Take 1 liter of electroplating wastewater, it is measured that the heavy metal copper contained in 1 liter of electroplating wastewater is 6g, nickel is 13g, hexavalent chromium is 13g, and contains 30g of highly toxic substances such as cyanide, and the pH value is 8;

[0039] 1) at first add the ferric sulfate of 10g and the ferric trichloride of 10g in 1L electroplating wastewater to be treated, the pH value of electroplating wastewater is adjusted to 4;

[0040] 2) Add 20g of hydrogen peroxide, 20g of sodium metabisulfite and 10g of bactericide to the electroplating wastewater after adjusting the pH, stir evenly, reduce the complex with hydrogen bonds through the reaction, and use the bactericide to adsorb heavy metals. Set aside to settle for 30 minutes;

[0041] 3) then in the treated electroplating wastewater, add 20g of flake caustic soda and 30g of quicklime to adjust the pH value to 10, then through precipitation treatment for 20 minutes, let the heavy metal i...

Embodiment 3

[0048] Get 1 liter of electroplating wastewater, after testing, the heavy metal copper contained in 1 liter of electroplating wastewater is 13g, nickel is 16g, hexavalent chromium is 20g, and contains 40g of highly toxic substances such as cyanide, and the pH value is 10;

[0049] 1) at first add the ferric sulfate of 5g and the ferric trichloride of 5g in 1L electroplating wastewater to be treated, the pH value of electroplating wastewater is adjusted to 3;

[0050] 2) Add 10g of hydrogen peroxide, 10g of sodium metabisulfite and 5g of bactericide to the electroplating wastewater after adjusting the pH, stir evenly, and reduce the complex with hydrogen bonds through the reaction. Let stand for 25 minutes;

[0051]3) then in the treated electroplating wastewater, add 10g of flake caustic soda and 15g of quicklime to adjust the pH value to 10, and then through precipitation for 20 minutes, let the heavy metal ions in the wastewater generate hydroxide precipitation by alkaline c...

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PUM

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Abstract

The invention provides an industrial plating wastewater treatment process. The process sequentially comprises the following operating steps that the PH value of plating wastewater is adjusted to be 3 to 4; 1-20 g / L of hydrogen peroxide, 2-20 g / L of sodium metabisulphite and 0.1-10 g / L of bactericidin are added to the wastewater, stirring is conducted for 20 min to 30 min, and precipitation is conducted. According to the industrial plating wastewater treatment process, the treated plating water can be discharged up to standard, complexes can be completely decomposed, harmful impurities can be removed, and operation is easy.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an industrial electroplating wastewater treatment process. Background technique [0002] Electroplating wastewater is a variety of wastewater discharged during the electroplating production process. Its sources mainly include plating cleaning water, waste electroplating solution, and other wastewater. It often contains Cr6+, Cu2+, Ni2+, Zn2+, Fe2+ and other heavy metal ions, and contains cyanide. and other highly toxic substances. Some heavy metal ions in wastewater exist in the form of simple cations, and some exist in the form of acid radical anions. Electroplating wastewater is more toxic and more harmful. For example, cyanide can cause acute poisoning and death of humans and animals, and chronic poisoning can also be caused by long-term effects at low concentrations. Cadmium can cause kidney disease. Hexavalent chromium can cause lung cancer, intestinal disease a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16C02F101/18C02F101/20C02F101/22
CPCC02F9/00C02F1/286C02F1/52C02F1/5245C02F1/56C02F1/66C02F1/70C02F1/722C02F1/76C02F2101/18C02F2101/20C02F2101/22C02F2103/16C02F2301/08C02F2305/026
Inventor 张明开顾维顾春
Owner JIANGSU SERO ANTICORROSION EQUIP
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