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Method for processing heavy metal Cd (Cadmium) contaminated soil

A technology of polluted soil and treatment methods, applied in the restoration of polluted soil, etc., to achieve good social and ecological benefits, simple operating conditions, and a wide range of applications

Active Publication Date: 2013-01-23
福建沃土环保集团有限公司
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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 method for treating heavy metal Cd polluted soil with simple operating conditions, easy implementation, wide application range, low cost and high efficiency, aiming at the deficiencies in the prior art for repairing heavy metal cadmium pollution in soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh a certain amount of rhamnolipid concentrate and put it into a dissolution kettle, then add an appropriate amount of deionized water to heat and stir to dissolve, then add pH to adjust the pH to 4.8, control the concentration to 0.5g / L, and cool to obtain rhamnose Lipid solution for use. Coal ash ceramsite and fine sand are mixed uniformly at a weight ratio of 3:10. The function of the fine sand is to prolong the residence time of heavy metal Cd in the permeable reaction wall, and put it into a sealed bag to make a permeable reaction wall for future use. In the Cd-contaminated soil that needs to be treated, the two ends of the 5-meter zone are respectively equipped with electrolytic cell bodies. The length of the electrolytic cell body is 0.4 meters, the width is 0.4 meters, and the height is 0.05 meters. The diameter of the two electrolytic cells is 0.05 meters. Meters, two graphite electrodes with a length of 0.06 meters, the two graphite electrodes are connected...

Embodiment 2

[0032] Weigh a certain quality of rhamnolipid concentrate and put it into a dissolution kettle, then add an appropriate amount of deionized water to heat and stir to dissolve, then add pH to adjust the pH to 8, control the concentration to 1g / L, and cool to obtain rhamnolipid The aqueous solution is ready for use. Use a certain quality of coal ash ceramsite and fine sand to mix evenly in a weight ratio of 3.5:10. The function of the fine sand is to prolong the residence time of heavy metal Cd in the permeable reaction wall, and put it into a sealed bag to make a permeable reaction wall. . In the Cd-contaminated soil that needs to be treated, the two ends of the 5-meter zone are respectively provided with electrolytic cell bodies. The length of the electrolytic cell body is 0.80 meters, the width is 0.80 meters, and the height is 0.10 meters. Two graphite electrodes with a length of 0.06 meters and a length of 0.06 meters are connected to a 120v voltage stabilized DC power sup...

Embodiment 3

[0034] Weigh a certain amount of rhamnolipid concentrate and put it into a dissolution kettle, then add an appropriate amount of deionized water to heat and stir to dissolve, then add pH to adjust the pH to 10, control the concentration to 2g / L, and cool to obtain rhamnolipid The aqueous solution is ready for use. A certain quality of coal ash ceramsite and fine sand are mixed evenly in a weight ratio of 5:10. The function of the fine sand is to prolong the residence time of heavy metal Cd in the permeable reaction wall, and put it into a sealed bag to make a permeable reaction wall for later use. . In the Cd-contaminated soil that needs to be treated, the four corners of the 8-meter zone are respectively provided with anode electrolytic cells made of polyvinyl chloride. The length of the anode electrolytic cell body is 0.80 meters, the width is 0.80 meters, and the height is 0.10 meters. Each electrolytic cell is provided with a diameter of 0.05 meters and a graphite electrode...

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Abstract

The invention discloses a method for processing heavy metal Cd contaminated soil, which is characterized by comprising the steps of adding rhamnolipid aqueous solution with concentration of 0.5-2g / L into a negative electrolytic tank, adding deionized water into a positive electrolytic tank, installing a filter cloth between the Cd contaminated soil needed to process and the negative electrolytic tank as well as the positive electrolytic tank, installing a permeable reaction wall on an enrichment place of the heavy metal Cd far away from five eighth of an anode S3, and switching on to electronically repair the Cd contaminated soil. The Cd concentration rate is above 4 times higher than an initial value; and under the function, the concentration rate is reduced to about 3.63 times, the total removal ratio of the heavy value Cd of the whole soil is about 40%, and the contribution ratio of the permeable reaction wall on the removal ratio is about 90%, so that the alkaline rhamnolipid solution proves that the process of the heavy metal from enrichment to removal can be realized by the electrical repair and the permeable reaction wall. The method is simple in operation condition, wide in range of application, low in cost, high in efficiency, liable to realize, and has the better social benefit and biological benefit on the heavy metal Cd contaminated soil.

Description

technical field [0001] The invention belongs to the field of microbial application technology and the field of environmental technology, and relates to a treatment method for heavy metal Cd polluted soil. Background technique [0002] Soil is one of the main natural resources that human beings rely on for survival, and it is also an important part of the human ecological environment. With the intensification of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals, soil heavy metal pollution is becoming more and more serious. Soil heavy metal pollutants are mainly lead, mercury, chromium, arsenic, cadmium, nickel and their compounds. Soil heavy metal pollution has the characteristics of poor mobility of pollutants in the soil, long residence time, and inability to be degraded by microorganisms. Plants and other media enter the human body through human digestive tract intake, respiratory tract inhalation, and skin absorption. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 喻泽斌黄俊胡晓
Owner 福建沃土环保集团有限公司
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