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Site contaminated soil ex-situ remediation agent and application method thereof

A technology of contaminated soil and ectopic remediation, applied in the field of soil remediation, can solve the problems of site remediation that cannot be reconstituted with pollution, and achieve the effects of improving the degree of porosity and air permeability, reducing soil compaction, and increasing the degree of porosity

Active Publication Date: 2020-04-21
重庆市固体废物管理服务中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above methods are all aimed at repairing the site with a single pollution source. For chemical and pharmaceutical enterprises, the original site often has organic matter and heavy metal complex pollutants, and the pollution factors in the soil mainly include lead, mercury, zinc, DDT, six-six sixth class
Apparently, the existing remediation agents cannot be used for the remediation of compound-polluted sites.

Method used

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  • Site contaminated soil ex-situ remediation agent and application method thereof
  • Site contaminated soil ex-situ remediation agent and application method thereof
  • Site contaminated soil ex-situ remediation agent and application method thereof

Examples

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Effect test

preparation example 1

[0041]Preparation example 1: 1. Chitosan with a deacetylation degree of 95% is mixed with 1 wt% acetic acid solution according to a weight ratio of 1:20 to prepare a chitosan-acetic acid solution;

[0042] ② Mix zeolite powder with a fineness of 100 mesh, potassium sodium tartrate, sodium silicate, tea saponin and water according to a weight ratio of 1:0.1:0.4:0.1:20 to obtain a suspension, and add 10wt% of Sodium hydroxide solution, adjust its pH to be 9;

[0043] ③Take 50kg of suspension, add 30kg of chitosan acetic acid solution dropwise, and stir while adding dropwise, the dropwise addition is completed within 1h, and after stirring for 10min, heat at 40°C for 6h, and then at 8000r / min Centrifuge at high speed for 10 minutes to obtain a precipitate, wash the precipitate with deionized water to neutrality, and dry it for 12 hours at a temperature of 60°C to obtain a dry product, crush and sieve the dry product to obtain a modified chitosan zeolite adsorbent.

preparation example 2

[0044] Preparation example 2: 1. the chitosan with a degree of deacetylation of 95% is mixed with the acetic acid solution of 1.8wt% according to the weight ratio of 1:25 to prepare the chitosan acetic acid solution;

[0045] ② Mix zeolite powder with a fineness of 100 mesh, potassium sodium tartrate, sodium silicate, tea saponin and water according to a weight ratio of 1:0.15:0.5:0.1:30 to obtain a suspension, and add 15wt% of Potassium hydroxide solution, adjust its pH to be 10;

[0046] ③Take 50kg of suspension, add 30kg of chitosan acetic acid solution dropwise, and stir while adding dropwise, the dropwise addition is completed within 1h, and after stirring for 20min, heat at 50°C for 8h, and then heat at 8000r / min Centrifuge at high speed for 10 minutes to obtain a precipitate, wash the precipitate with deionized water to neutrality, and dry it for 24 hours at a temperature of 65°C to obtain a dry product, crush and sieve the dry product to obtain modified chitosan zeoli...

preparation example 3

[0047] Preparation example 3: 1. the chitosan with a degree of deacetylation of 95% is mixed with the acetic acid solution of 2.5wt% according to the weight ratio of 1:30 to prepare the chitosan acetic acid solution;

[0048] ② Mix zeolite powder with a fineness of 100 mesh, potassium sodium tartrate, sodium silicate, tea saponin and water according to a weight ratio of 1:0.2:0.6:0.1:40 to obtain a suspension, and add 20wt% of Sodium hydroxide solution, adjust its pH to be 9;

[0049] ③Take 50kg of suspension, add 30kg of chitosan acetic acid solution dropwise, stir while adding, dropwise add within 1h, stir for 30min, heat at 60°C for 10h, then heat at 8000r / min Centrifuge at high speed for 10 minutes to obtain a precipitate, wash the precipitate with deionized water to neutrality, and then dry it for 36 hours at a temperature of 70°C to obtain a dry product, crush and sieve the dry product to obtain modified chitosan zeolite adsorbent.

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Abstract

The invention discloses a site contaminated soil ex-situ remediation agent and an application method thereof, relates to the technical field of soil remediation, and is characterized in that the sitecontaminated soil ex-situ remediation agent is composed of a stable curing agent and a soil conditioner, and the stable curing agent is prepared from the following components in parts by weight: 40 to50 parts of a chitosan modified zeolite adsorbent, 20 to 30 parts of quick lime, 15 to 20 parts of clay, 5 to 10 parts of silica powder, 10 to 15 parts of an oxidizing agent and 5 to 7 parts of a metal oxide. By means of the remediation agent, organic pollutants in soil can be removed while heavy metal in the soil loses bio-availability, and the remediation agent has an excellent remediation effect.

Description

technical field [0001] The invention relates to the technical field of soil remediation, more specifically, it relates to a site-contaminated soil heterotopic remediation agent and an application method thereof. Background technique [0002] Contaminated soil refers to the soil in which the harmful and toxic substances entering the soil exceed the self-purification capacity of the soil, resulting in changes in the physical, chemical, and biological substances of the soil, which affect human health or the ecological environment. Soil remediation is required for polluted soil. Soil remediation refers to the use of physical, chemical or biological methods to fix, transfer, absorb, degrade or transform pollutants in the soil of the site, reducing its content to an acceptable level, or converting toxic and harmful pollutants into harmless substances Process; Contaminated site remediation technology can be divided into in-situ remediation and ex-situ remediation according to the r...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C09K101/00C09K109/00
CPCB09C1/08C09K17/40C09K2101/00C09K2109/00
Inventor 谢靖宇陈力罗文娟
Owner 重庆市固体废物管理服务中心有限公司
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