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Method for combined remediation of DDTs-PAHs combined contaminated soil

A composite pollution and joint restoration technology, applied in the field of agricultural soil organic pollution restoration, can solve problems such as low restoration efficiency, and achieve the effects of promoting decomposition, improving degradation efficiency and high restoration effect.

Active Publication Date: 2016-10-12
丹东市金山投资建设发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the bioremediation process of organic contaminated soil, plants and microorganisms can only absorb and degrade dissolved organic pollutants in the soil solution, and the remediation efficiency is low.

Method used

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  • Method for combined remediation of DDTs-PAHs combined contaminated soil
  • Method for combined remediation of DDTs-PAHs combined contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: In situ restoration test of protected agricultural soil

[0020] This experiment adopts the on-site repair experiment, and the experimental site is selected in the Shenyang Suburb Agricultural Base. First, the soil in the facility greenhouse is plowed (the plowing depth is 20-40 cm), leveled, and dried under natural conditions for 1-2 weeks. Then the soil was divided into 1.5 m × 1.5 m square soil grids, and a 40-50 cm wide interval was left between each two soil grids. A total of four treatments were done: (1) Control treatment without adding anything; (2) Mixed degrading bacteria + 5mg / kg rhamnolipid + rape (RL5); (3) Mixed degrading bacteria + 10mg / kg rhamnose fat + rapeseed (RL10); (4) mixed degrading bacteria + 20mg / kg rhamnolipid + rapeseed (RL20).

[0021] The specific implementation steps are as follows:

[0022] (1) The high-efficiency degrading bacteria methylotrophic Bacillus and Arthrobacter globosa screened out in the laboratory were made into...

Embodiment 2

[0023] Example 2: Simulation test of in-situ remediation of protected agricultural soil

[0024]In this experiment, an on-site repair experiment was adopted, and a certain amount of DDT pollutants were artificially added to the farmland soil of the facility, and repaired after a period of equilibrium. The experimental site was chosen in Shenyang Suburban Facilities Agriculture Base. First, add a certain dose of DDT pollutants to the soil in the facility greenhouse, then plow it (plowing depth is 20-40 cm), level it, and dry it under natural conditions for 1-3 months. Then the soil was divided into 1.5 m × 1.5 m square soil grids, and a 40-50 cm wide interval was left between each two soil grids. A total of four treatments were done: (1) Control treatment without adding anything; (2) Mixed degrading bacteria + 5mg / kg rhamnolipid + rape (RL5); (3) Mixed degrading bacteria + 10mg / kg rhamnose fat + rapeseed (RL10); (4) mixed degrading bacteria + 20mg / kg rhamnolipid + rapeseed (R...

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Abstract

The invention relates to a method for remediation of contaminated soil, in particular to a method for combined remediation of DDTs-PAHs combined contaminated soil. Biosurfactant rhamnolipid is combined with efficient mixed degrading bacteria to strengthen and promote organic chloride pesticide DDTs and PAHs left in facility agriculture soil for decomposition and conversion; and meanwhile low-accumulation vegetable crops are planted, and microbial growth and degradation of the organic contaminant DDTs and PAHs are further strengthened through the plant root system metabolism and the chemical stimulation function of root exudates. The method has the beneficial effects that damage to the environment is small, no secondary contamination is generated, cost is low, large-scale operation is easy, and the production and economic income are not influenced; the method is a safe and effective in-situ remediation technology capable of achieving remediation and production at the same time; and the method is suitable for remediation of the intermediate and low contamination facility agriculture soil where crops are still planted.

Description

technical field [0001] The invention relates to the research field of remediation of organic pollution in agricultural soil, in particular to a combined surfactant-plant-microorganism remediation method for remediating compound pollution of organochlorine pesticide DDT and polycyclic aromatic hydrocarbons in agricultural soil with facilities. Background technique [0002] For a long time, in order to pursue higher yields and economic benefits, the application of fertilizers and pesticides has been increasing. According to statistics, my country's annual pesticide application amount reaches 50-60×10 7 kg. During the pesticide spraying process, only 8% of the pesticides will be absorbed by the crops, and about 40-50% of the pesticides will fall on the soil surface. The number of farmlands polluted by pesticides across the country has reached 16 million hm 2 , The rate of exceeding the standard of pesticides in major agricultural products is as high as 16-20%. Although the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/10B09C1/105
Inventor 张鸿龄吕良禾马国峰孙丽娜
Owner 丹东市金山投资建设发展有限公司
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