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Method for removing heavy metal chromium in sewage

A technology for heavy metals and sewage, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of large investment, high operating costs, and difficulty in reaching water standards, and achieves simple process flow, The effect of low operating costs

Inactive Publication Date: 2013-04-03
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method can effectively remove chromium in wastewater, but there are problems such as large investment, high operating cost, difficulty in reaching the standard after treatment, and large sludge output.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Implementation case 1:

[0022] (1) Get the sewage from the secondary sedimentation tank, the chromium ion concentration in the sewage is 50mg / L, add cationic polyacrylamide to settle the sewage;

[0023] (2) Adding 10ppm sodium sulfide 20%, hydrogen sulfide 30%, glycerol 25%, isopropanol 25% to the settled sewage, while adjusting the pH to be 8.0;

[0024] (3) Stir the sewage with a mechanical stirring device for 10 minutes;

[0025] (4) Add 5ppm cyclopentanedione in the stirred sewage, and then stir for 10 minutes;

[0026] (5) Static, settling, scraping the oily liquid on the top of the sewage to get the sewage with heavy metal chromium removed, which can reduce the heavy metal chromium in the waste water to 0.1mg / L, and the chromium removal rate has reached 99.8%.

[0027] Implementation case 2:

[0028] (1) Get the sewage from the secondary sedimentation tank, the chromium ion concentration in the sewage is 75mg / L, add cationic polyacrylamide to settle the sewag...

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PUM

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Abstract

The invention discloses a method for removing heavy metal chromium in sewage and belongs to the field of sewage treatment in environmental protection. According to the method disclosed by the invention, an ion settling agent and organic alcohol are added into settled sewage to achieve the aim of removing the heavy metal chromium in the sewage. The ion settling agent is two or three of hydrosulfide, sulfide, carbonate and alkali metal; and the organic alcohol is two or three of octcosnol, isopropanol, glycol, glycerol and cyclohexanol. The materials are as follows by mass percentage: 20-30% of the hydrosulfide, 10-15% of the sulfide, 20-30% of the carbonate, 5-8% of the alkali metal, 10-25% of the octcosnol, 15-25% of the isopropanol, 15-45% of the glycol, 10-15% of the glycerol and 25-30% of the cyclohexanol. The method disclosed by the invention has the characteristics of simple process flow, lower operation cost, no sludge, high chromium removing effect and the like.

Description

technical field [0001] The invention relates to a method for removing heavy metal chromium in sewage, in particular to treating waste water with a chromium concentration in the range of 10-100 mg / L, and belongs to the field of waste water treatment in environmental protection. Background technique [0002] The discharge of heavy metal chromium-containing wastewater has serious hazards to human health and industrial and agricultural activities. It has hazards such as persistence, high toxicity, and serious pollution. Once it enters the environment, it cannot be biodegraded. Most of it participates in the food chain cycle and eventually accumulates in organisms. , destroy the normal physiological and metabolic activities of organisms, and endanger human health. With the increasing production activities such as mining, smelting and processing of heavy metals, the amount and types of heavy metal wastewater produced have greatly increased, causing serious environmental pollution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/62C02F101/22
Inventor 郭迎庆王艳杰冯欣欣
Owner CHANGZHOU UNIV