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Ectopic remediation process for VOCs/SVOCs contaminated soil

A technology for polluted soil and ex-situ remediation, applied in the field of environmental engineering, can solve the problems of lack of relatively perfect remediation process, immature development of treatment technology, etc., and achieve the effect of efficient remediation, improved air lift effect, and high efficiency

Active Publication Date: 2019-08-16
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's soil remediation industry has just started, and the development of treatment technology is immature, especially for the remediation of soil contaminated by organic matter. At present, there is no relatively complete remediation process

Method used

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  • Ectopic remediation process for VOCs/SVOCs contaminated soil

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with drawings and embodiments.

[0021] refer to figure 1 , an ex-situ remediation process for VOCs / SVOCs contaminated soil, comprising the following steps:

[0022] In the first step, the polluted soil (concentration of VOCs / SVOCs is 2100-2600mg / kg) that has been mechanically pulverized with a particle size of no more than 2 mesh VOCs / SVOCs is passed through the conveyor belt 1 at a distance of 5m. 3 The speed of / h is sent in the rotary gas stripping furnace 3, then evenly distributed in the furnace cavity of the rotary gas stripping furnace 3 under the agitation of the screw propeller 31 in the rotary gas stripping furnace 3;

[0023] The screw propeller 31 in the rotary gas stripping furnace 3 is driven by a motor to continuously rotate, and the inclination angle of the rotary gas stripping furnace 3 is set to 15°, so that the purified soil can flow out from the rotary gas stripping furnace 3;

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Abstract

An ectopic remediation process for VOCs / SVOCs contaminated soil comprises the steps of: crushing the VOCs / SVOCs contaminated soil and feeding the soil into a rotary gas stripping furnace; jetting CO2into a furnace chamber of the rotary gas stripping furnace from a CO2 injection pipe in the rotary gas stripping furnace, so that the CO2 is in full contact with the polluted soil and VOCs / SVOCs are stripped; enabling the purified soil to flow out under the action of a spiral propeller in the rotary gas stripping furnace and the gravity of the soil, and returning the soil to the gas stripping furnace; after dust in gas generated by steam stripping is removed in a cloth bag separator, feeding the gas into a photocatalyst decomposer to completely decompose VOCs / SVOCs into CO2 and H2O; compressing the CO2 by a compressor and then feeding the gas into the CO2 injection pipe to be recycled. By means of the ectopic remediation process, environment-friendly and efficient remediation of VOCs / SVOCscontaminated soil is achieved.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to an ex-situ restoration process for VOCs / SVOCs polluted soil. Background technique [0002] With the development of the economy and the continuous progress of science and technology, while enjoying the convenience brought by industrialization, we are also facing more and more problems, especially environmental problems. The problem of soil organic pollution is one of the environmental problems that are widely concerned around the world. Most of the organic pollutants are insoluble, toxic, mutagenic, and even carcinogenic, which have a huge impact on human health and ecosystems. harm. Organic pollutants can be divided into volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs) and non-volatile organic compounds according to their volatility, and VOCs and SVOCs have a greater impact on human health. [0003] Sources of organic pollutants in so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/08
Inventor 韩霁昌刘宗宽顾兆林毛忠安张扬李进孙婴婴
Owner XI AN JIAOTONG UNIV
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