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Method for remedying OCPs contaminated soil by combining zero-valent iron composite material with microorganisms

A technology of microbial remediation and composite materials, applied in the field of zero-valent iron composite materials combined with microbial remediation of OCPs contaminated soil, can solve problems such as limiting the remediation ability of nano-zero-valent iron, destroying soil structure and ecology, and limiting the remediation effect of nano-zero-valent iron

Inactive Publication Date: 2019-04-16
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

After a lot of research and practical application, it is found that although nZVI has excellent degradation ability, its defects are also prominent, mainly: (1) Nano-ZVI has high surface energy and high magnetic properties, which cause huge defects that are easy to agglomerate, which limits the repair of nano-ZVI Effect; (2) It is easily oxidized in the air, forming a passivation layer and reducing the activity, which limits the repair ability of nano-zero-valent iron; (3) Because the particle size of nano-zero-valent iron is too small, it can pass through biofilm and destroy microbial cells Moreover, elemental metals have biological toxicity; (4) soils that are applied with zero-valent iron are prone to hardening, and the degree of hardening is proportional to the amount of application, destroying soil structure and ecology

Method used

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  • Method for remedying OCPs contaminated soil by combining zero-valent iron composite material with microorganisms
  • Method for remedying OCPs contaminated soil by combining zero-valent iron composite material with microorganisms

Examples

Experimental program
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Embodiment

[0025] Embodiment: a kind of zero-valent iron composite material unites the method for microbial remediation OCPs polluted soil, comprises the following steps:

[0026] Step 1: Preparation of BC / nZVI

[0027] Take the peanut shells, wash them, dry them at 70°C for 2 hours, break them into pieces of about 2cm, put them in a crucible, cover them tightly, wrap them tightly in tin foil, and put them in a muffle furnace preheated to 300°C. Oxygen burning for 2 hours, weighing after cooling; grinding the burned biochar material, passing through a 60-mesh sieve, and using 30% HNO 3 The solution was soaked for 2 hours to remove ash; then filtered, washed repeatedly with deionized water for 3 times, and dried at 70°C for 2 hours to obtain biochar, which was sealed and stored for later use; pure ferrous sulfate heptahydrate was added to a three-necked flask Water and ethanol mixed solution, according to the ratio of nanometer zero-valent iron: biochar = 1:2, add 60 mesh biochar, turn o...

experiment example

[0035]Experimental example: In order to investigate the remediation process and effect of the above-mentioned BC / nZVI combined microbial remediation of OCPs-contaminated soil, this project conducts the following research:

[0036] Taking organochlorine pesticide-contaminated soil as an object, the following research was carried out:

[0037] Step 1: Contaminated soil preparation

[0038] The original test soil was taken from an abandoned plot of a pesticide factory in Jiangsu, air-dried, passed through a 10-mesh sieve, and stored for use. The main pollutants were determined to be α-HCH and γ-HCH. The initial concentration of α-HCH was 10.737-11.574 mg / kg, and that of γ-HCH was 45.506-55.607 mg / kg.

[0039] Step 2: Preparation of biochar materials, nano-zero-valent iron materials, and biochar-supported nano-zero-valent iron composite materials

[0040] Adopt the method in the embodiment to prepare biochar material and material charcoal-supported nanometer zero valent iron com...

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Abstract

The invention discloses a method for remedying organo-chlorine pesticide (OCPs) contaminated soil by combining a zero-valent iron composite material with microorganisms. The method comprises the following steps that 1, a biomass material is taken, and biochar is prepared by means of the biomass material and serves as a nanometer zero-valent iron loaded material; by means of a liquid phase reduction method, a biochar loaded nanometer zero-valent iron material (BC / nZVI) is prepared; 2, specific degrading bacteria are screened and separated; 3, to-be-remedied soil is pretreated; 4, the to-be-remedied soil is treated. Accordingly, aiming at the damage of ZVI to the soil structure and soil environment and the defect of the microorganisms to OCPs degrading capability, the novel BC / ZVI compositematerial is combined with the microorganisms for remedying, the ZVI reductive dechlorination effect, the biochar adsorption and soil improvement effect and the microorganism degradation effect are fully utilized, and remedying on OCPs contaminated soil is achieved.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a method for remediating OCPs-contaminated soil with a zero-valent iron composite material combined with microorganisms. Background technique [0002] my country is a traditional agricultural country, and agriculture is the foundation of the Chinese nation. In order to ensure the yield of agricultural products and reduce pests, a large number of pesticides are used. As the most important product of the chlor-alkali industry, organochlorine pesticides (OCPs) have played a pivotal role in the long history of pesticide use. The current domestic soil treatment technologies for OCPs-contaminated sites (including incineration, rotary kiln co-disposal and thermal desorption, etc.) are in economical, energy consumption, secondary pollution control, construction difficulty, and treatment cycle for soil polluted by medium and low concentrations of OCPs. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/10B09C2101/00
Inventor 万金忠张胜田龙涛周艳李群范婷婷邓绍坡杨璐祝欣应蓉蓉赵远超张新婷王祥
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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