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Method for removing heavy metal in electroplating waste

A technology for electroplating wastewater and heavy metals is applied in the removal of heavy metals in electroplating wastewater, in the field of environmental protection and treatment of polluted wastewater, which can solve the problems of secondary environmental pollution, occupation of land resources, etc., to reduce the pressure of sewage discharge and adsorption. Good effect and cost saving effect

Inactive Publication Date: 2008-05-07
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For tannery sludge, landfill, incineration, stacking and other methods are generally used at present, which not only occupy valuable land resources, but also may cause secondary pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Example 1 Add 350 kg of wet tannery sludge with a moisture content of 56% to 100,000 L of copper-containing electroplating wastewater, stir at a speed of 150 rpm for 30 minutes, and let stand for 30 minutes. After the suspended sludge and other particles settle, the supernatant Discharged into the sewage network pipe, sludge dehydration and compression. The content of heavy metal copper in the treated supernatant decreased from 15.45mg / l in the original wastewater to 1.65mg / l.

example 2

[0017] Example 2 Add 250 kg of wet tannery sludge with a moisture content of 60% to 50,000 L of zinc-containing electroplating wastewater, stir at a speed of 100 rpm for 20 minutes, and let stand for 40 minutes. After the suspended sludge and other particles settle, the supernatant Discharged into the sewage network pipe, sludge dehydration and compression. The content of heavy metal zinc in the treated supernatant decreased from 12.38mg / l in the original wastewater to 0.65mg / l. The supernatant (effluent) reaches the third-level discharge standard of the national sewage comprehensive discharge.

example 3

[0018] Example 3 joins the comprehensive electroplating waste water (Cr is 7.38mg / l, Cu is 0.68mg / l, Ni is 2.07mg / l, Zn is 3.04mg / l) the wet tannery sludge 200kg that moisture content is 50% joins 100000L ), stirred at a speed of 50rpm for 60min, and after standing for precipitation, the supernatant was discharged into the sewage network pipe, and the sludge was dehydrated and compressed. The heavy metals in the treated supernatant decreased to Cr0.04mg / l, Cu0.0.10mg / l, Ni0.05mg / l, Zn1.97mg / l respectively. The supernatant (effluent) reaches the third-level discharge standard of the national sewage comprehensive discharge.

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PUM

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Abstract

The invention provides a method of removing the heavy metal in electroplating waste water, and belongs to the technical filed of environmental protection. Electroplating waste water is waste water containing chrome (Cr), waste water containing nickel (Ni), waste water containing cadmium (Cd), waste water containing copper (Cu), waste water containing zinc (Zn), waste water containing aurum (Au) and waste water containing argentums (Ag), or mixed-heavy metal waste water containing various heavy metals. 2 to 5 grams of tanning wet sludge is added into each liter of electroplating waste water; quickly stirring for 20 to 30 minutes and resting for 30 minutes, after the suspended sludge particles are settled, the solid is separated from the liquid; the supernatant solution can be discharged, and the sludge is dehydrated and compressed and then performed harmless treatment. The tanning wet sludge is the sludge produced during producing the raw hide, with 50 to 60 percent of water ratio, 30 to 50 percent of crude protein and 27 to 44 percent of cellulose.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a treatment technology for polluted waste water, in particular to an environmental protection technology for using pollution to make pollution, in particular to a method for removing heavy metals in electroplating waste water. Background technique [0002] According to statistics, the current discharge of electroplating wastewater in the country is 4×10 8 tons / a, and the provinces of Guangdong, Zhejiang and Jiangsu have the largest emissions. The composition of electroplating wastewater is very complex. In addition to cyanide (CN-) wastewater and acid-base wastewater, heavy metal wastewater is a potentially harmful category of wastewater in the electroplating industry. According to the classification of heavy metal elements contained in heavy metal wastewater, it can generally be divided into chromium (Cr)-containing wastewater, nickel (Ni)-containing wastewater, ...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/52
Inventor 夏会龙
Owner ZHEJIANG GONGSHANG UNIVERSITY
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