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System and method for restoring organic matter-heavy metal composite polluted soil through straw

A technology of polluted soil and compound pollution, which is applied in the system field of repairing organic matter-heavy metal compound polluted soil to achieve the effect of recycling

Pending Publication Date: 2017-02-15
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention solves the technical problem of simultaneously repairing organic pollutants and heavy metal pollution, and has simple technological process and quick response

Method used

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  • System and method for restoring organic matter-heavy metal composite polluted soil through straw
  • System and method for restoring organic matter-heavy metal composite polluted soil through straw
  • System and method for restoring organic matter-heavy metal composite polluted soil through straw

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Embodiment

[0059] In this example, aiming at the composite pollutants of organic matter and heavy metals, the composite simulated polluted soil containing heavy metals lead, cadmium, and organic compounds benzanthracene and phenol was prepared as the test object, and the contaminated soil remediation treatment test was carried out.

[0060] In this embodiment, the parameters for the thermal desorption treatment of the contaminated soil are as follows: the treatment capacity is 20 t / d, the thermal desorption temperature is 600° C., and the thermal desorption time is 45 minutes. After the thermal desorption reaction, the content of organic matter in the soil and the leaching concentration of heavy metals were determined.

[0061] Table 1 Organic matter removal rate and heavy metal leaching rate in polluted soil

[0062]

[0063] It can be seen from Table 1 that the present invention can use straw to realize simultaneous removal of heavy metal and organic pollution in organic-heavy metal...

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Abstract

The invention discloses a system and method for restoring organic matter-heavy metal composite polluted soil through straw. The system comprises a mixing device and a heat desorption furnace; the mixing device comprises a straw inlet, a polluted soil inlet and a mixture outlet; the heat desorption furnace comprises a mixture inlet, a high-temperature oil and gas outlet and a clean soil outlet; and the mixture inlet is connected with the mixture outlet of the mixing device. The method includes the steps that mixing is performed, wherein polluted soil and the straw are fed into the mixing device to be mixed, and a mixture is obtained; and heat desorption is performed, wherein the mixture is fed into the heat desorption furnace through the mixture inlet of the heat desorption furnace and is subjected to a heat desorption reaction under T temperature, the reaction time is t, and high-temperature oil and gas and clean soil are obtained. By means of the system and method, heavy metal and organic pollutants in the polluted soil can be effectively removed, energy conservation and emission reduction are achieved, and operation is easy and convenient.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a system and method for remediating organic matter-heavy metal compound polluted soil by using straw. Background technique [0002] In recent years, with the rapid development of my country's urbanization process and the adjustment of industrial layout, a large number of chemical, smelting, electroplating and other enterprises in the old urban areas of most large and medium-sized cities have been relocated or closed. Perfection, resulting in the legacy of a large number of heavily polluted sites. Most of these heavily polluted sites have complex pollution of high concentrations of heavy metals and organic matter. [0003] Soil complex pollution refers to the coexistence of two or more pollutants in the soil, while the concentration of pollutants exceeds the national soil environmental quality standard or has reached the level that affects the soil environmental quality. ...

Claims

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Application Information

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IPC IPC(8): B09C1/06
CPCB09C1/065
Inventor 王惠惠巴玉鑫吴小飞牛明杰肖磊吴道洪
Owner SHENWU TECH GRP CO LTD