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Method for treating chromium-containing wastewater

A treatment method, a technology of chromium wastewater, applied in the field of water treatment, can solve the problems of complex process and high cost, and achieve the effect of simple process, easy operation and no secondary pollution

Inactive Publication Date: 2018-12-18
贾炎龙
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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 provide a treatment method for chromium-containing wastewater, which solves the problems of high cost and complicated process in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The wastewater in the production process of the metallurgical industry is selected for treatment. The process is as follows: use carbon nanotubes to adsorb chromium-containing wastewater; add dilute sulfuric acid to the adsorbed chromium-containing wastewater to adjust the pH to 2-3; add reducing agent NaHSO 3 , make the chromium-containing wastewater treated in step 2 carry out reduction reaction; add inorganic flocculant polyferric sulfate, put it in according to the ratio of 0.02 kg per cubic meter of wastewater, and make it react for 8 hours; add alkali to the wastewater after the flocculation reaction is completed Liquid, make it fully react for 40min, get rid of excess free chromium ions; separate water and precipitate.

[0029] The wastewater treated through the above steps is tested, and the total chromium content is 0.8mg / L, and the hexavalent chromium content is 0.4mg / L, which is in line with the chromium content regulations in my country's industrial wastewate...

Embodiment 2

[0031] The wastewater in the production process of the textile industry is selected for treatment. The process is as follows: use carbon nanotubes to adsorb chromium-containing wastewater; add dilute sulfuric acid to the adsorbed chromium-containing wastewater to adjust the pH to 2-3; add reducing agent NaHSO 3 , make the chromium-containing wastewater treated in step 2 carry out reduction reaction; add inorganic flocculant polyaluminum ferric sulfate, put it in according to the ratio of 0.03 kg per cubic meter of wastewater, and make it react for 10 hours; after the flocculation reaction is completed, add Alkaline, let it fully react for 60 minutes, remove excess free chromium ions; separate water and sediment.

[0032] The wastewater treated through the above steps is tested, and the total chromium content is 0.6mg / L, and the hexavalent chromium content is 0.2mg / L, which is far lower than the chromium content regulations in my country's industrial wastewater discharge standar...

Embodiment 3

[0034] The wastewater in the production process of the textile industry is selected for treatment. The process is as follows: use carbon nanotubes to adsorb chromium-containing wastewater; add dilute sulfuric acid to the adsorbed chromium-containing wastewater to adjust the pH to 2-3; add reducing agent NaHSO 3 , make the chromium-containing wastewater treated in step 2 undergo reduction reaction; add inorganic flocculant polyaluminum sulfate, put it in according to the ratio of 0.03 kg per cubic meter of wastewater, and make it react for 12 hours; add alkali to the wastewater after the flocculation reaction is completed solution, make it fully react for 50 minutes, remove excess free chromium ions; separate the water and the precipitate.

[0035] The wastewater treated through the above steps is tested, and the total chromium content is 0.8mg / L, and the hexavalent chromium content is 0.4mg / L, which is in line with the chromium content regulations in my country's industrial was...

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PUM

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Abstract

The invention discloses a method for treating chromium-containing wastewater. The method realizes the reduction of hexavalent chromium ions in the chromium-containing wastewater and the adsorption andflocculation treatment of low-valent chromium ions in the chromium-containing wastewater and removes all the chromium ions in the chromium-containing wastewater through steps consisting of adsorption, acid addition, a reduction reaction, flocculation, a precipitation reaction, separation and the like. The method is low in the cost of raw materials, simple in process, easy to operate, free of secondary pollution, good in chromium removal effect, and extensively applicable to the metallurgy industry, the chemical industry, the mineral engineering industry, the electroplating industry, the chrome preparation industry, the pigment industry, the pharmacy industry, the light and textile industry, the production industry of chromium salts and chromium compounds and other industries; and the method can reduce environmental damage caused by industrial wastewater and protect human health and safety.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a treatment method for chromium-containing wastewater. Background technique [0002] A series of industries such as gold, chemical industry, mineral engineering, electroplating, chromium production, pigments, pharmaceuticals, light industry textiles, chromium salts and chromium compound production will produce a large amount of chromium-containing wastewater. Mainly trivalent chromium and hexavalent chromium, but hexavalent chromium is highly toxic, about 100 times that of trivalent chromium, and hexavalent chromium mainly exists in the form of chromate. Chromium can invade the human body through the digestive tract, respiratory tract, skin and mucous membranes, and mainly accumulate in the liver, kidney, endocrine system and lungs. Chromium compounds are carcinogenic. Chromium compounds enter human tissues in the form of steam and dust, and are slowly metabolized and elim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/22
CPCC02F1/283C02F1/5236C02F1/66C02F1/70C02F9/00C02F2101/22
Inventor 贾炎龙
Owner 贾炎龙