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Method of treating chromium pollution using sludge in sewage plant

A sewage treatment plant, chromium pollution technology, applied in the restoration of polluted soil, etc.

Inactive Publication Date: 2008-11-19
胡科洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical scheme of utilizing sludge for treatment has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1. Take 100 kilograms of remaining sludge from a municipal sewage treatment plant, and take 200 kilograms of chromium residue from a chlorate plant, and add it to a mixer to react for 20 minutes. The reacted material is tested and its hexavalent chromium is less than 0.1PPM.

Embodiment 2

[0012] Example 2. Take 100 kg of chromium residue from a chromium salt plant and crush it to 100 meshes. According to the weight of the chromium residue, add 30% sulfuric acid to adjust the pH to 3, and then add 600 kg of municipal sewage plant sludge. The liquid ratio is 1:0.3 into the mixer. After 20 minutes of reaction, the hexavalent chromium is qualified according to the national standard.

Embodiment 3

[0013] Example 3. After the demolition of the chromium salt plant, 100 kilograms of construction waste polluted by hexavalent chromium (hexavalent chromium = 230PPM) was crushed to 60 meshes, and 50 kilograms of dried sludge from the sewage treatment plant (pulverized to 60 meshes) ), the reaction is carried out for 30 minutes according to the solid-liquid ratio of 1:0.5, and the reacted materials are qualified according to national standards.

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PUM

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Abstract

The invention relates to a method by utilizing sludge in a sewage plant to treat the pollution of chromium. The method comprises the steps of proportioning sludge discharged from a sewage treatment plant and hexavalent chromium pollutant, crushing, mixing, agitating, allowing detoxification reaction, and treating the pollution of hexavalent chromium. The method can be used for treating dregs of the chromium, restoring a chromium pollution site after the chromium pollution site is removed, and treating the polluted soil of the hexavalent chromium. The method of the invention utilizes waste to treat the waste, and is simple and feasible.

Description

1. Technical Field [0001] The invention relates to the field of environmental protection. 2. Background technology [0002] The sludge discharged from sewage treatment plants, soil contaminated by hexavalent chromium, construction waste contaminated by hexavalent chromium, and chromium-containing waste slag discharged from chemical, metallurgical and other industries are the focus of environmental protection at home and abroad. Its pollution is serious, and how to treat it harmlessly is an urgent problem. The development of its technology has attracted the attention of domestic and foreign engineers and technicians. For the treatment of hexavalent chromium pollution, many treatment and utilization methods have been developed separately. However, the technical scheme of using sludge for treatment has not yet been reported. Third, the content of the invention [0003] The purpose of the present invention is to "utilize waste and treat waste", using sludge to treat chromium polluti...

Claims

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Application Information

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IPC IPC(8): A62D3/30B09C1/08A62D101/43
Inventor 胡科洋刘洋刘梅锡
Owner 胡科洋
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