Method for trapping and fixing soil persistent organic pollutant using biological carbon

A technology of organic pollutants and biological carbon, applied in the restoration of polluted soil and other directions, can solve the problem of no patent reports, and achieve the effects of reducing biological effectiveness, simple preparation process, and no secondary pollution.

Inactive Publication Date: 2009-03-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Examples

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Example Embodiment

[0011] Example 1

[0012] The waste rice straw is air-dried and crushed and sieved through 10 meshes. The powdered rice straw biomass is added to the reactor and carbonized at 250° C. and oxygen-limited conditions for 0.5 hours to prepare the bio-carbon adsorbent BC-1 with a yield of 60%.

Example Embodiment

[0013] Example 2

[0014] The waste rice straw is air-dried and crushed and sieved through 100 mesh. The powdered rice straw biomass was added to the reactor and carbonized at 350° C. and oxygen-limited conditions for 3 hours to prepare the bio-carbon adsorbent BC-2 with a yield of 45%.

Example Embodiment

[0015] Example 3

[0016] The waste rice straw is air-dried and crushed and sieved through 200 meshes. The powdered rice straw biomass was added to the reactor and carbonized at 550° C. and oxygen-limited conditions for 6 hours to prepare the bio-carbon adsorbent BC-3 with a yield of 22%.

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Abstract

The invention disclose a method for intercepting and fixing the persistent organic contaminants of soil through bio-carbon which includes the following steps: 1) a biomass material is carbonized for 0.5 to 6 hours under the temperature of 250 to 550 DEG C and the condition of oxygen limitation and passes through the screen of 10 to 200 meshes, thus preparing the bio-carbon; 2) the prepared bio-carbon is added into the soil polluted by the persistent organic matters according to the ratio of 1 to 200tons/hektare and the soil within 0 to 30cm of a surface layer is ploughed for leading the soil to be fully mixed with the bio-carbon; 3) after being aged, the bio-carbon fiercely absorbs the persistent organic matters, thereby greatly reducing the biological effectiveness thereof and being capable of producing safe farm products in the oil polluted by the organic mattes. The bio-carbon adopted by the treatment method has the advantages of easy obtaining, low cost, environmental friendlessness, non-secondary pollution, simple preparation technique, good treatment effect and long time effectiveness; simultaneously the bio-carbon contains a plurality of carbon and other nutrition elements, thus being capable of providing abundant carbon sources and nutrition for the growing of soil crops and having the effect for enriching the soil.

Description

technical field [0001] The invention relates to the remediation and control of soil polluted by organic matter, in particular to a method for retaining and fixing soil persistent organic pollutants by biological carbon. Background technique [0002] Soil is an important part of the human environment, an indispensable and non-renewable natural resource, and an important basis for the survival of all living things and the growth of crops. At the same time, soil is the source and sink of various pollutants. With the development of modern industrial and agricultural production, large-scale application of chemical fertilizers and pesticides, industrial waste water continuously invades farmland, urban industrial waste and other artificial synthetic substances continuously enter the soil, landfill leakage, oil well mining and atmospheric subsidence cause soil environmental pollution accidents Keep happening. After pollutants enter the soil, they not only affect the growth and dev...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 陈宝梁元妙新王银善
Owner ZHEJIANG UNIV
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