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Zero-valent iron and biochar source composite chemical for in-situ remediation of groundwater contaminated with chlorinated hydrocarbons

A technology of biological carbon source and compound agent, applied in water pollutants, biological water/sewage treatment, water/sludge/sewage treatment, etc. Enhanced stimulating effect

Pending Publication Date: 2017-11-17
北京市科学技术研究院资源环境研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are also related researches on strengthening bioremediation through the method of adding bacteria, but the cost of this repair technology is high, and the existence of various chlorinated hydrocarbons and the complex site environment are easy to inhibit the growth of the added bacteria

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]The laboratory weighed 20g of secondary reduced zero-valent iron powder of 200 meshes, 1g of glucose, 1g of sodium acetate, 0.6g of sodium carboxymethyl cellulose, 2g of bentonite, and 0.1g of yeast extract powder and mixed them thoroughly, then added 55g of water, 20g of food-grade soybean oil and 0.4g of Tween-80 were placed in a high-speed beater and stirred for 15 minutes to form a slurry. The prepared slurry is uniform and stable, and does not separate or settle after standing for more than 24 hours. Take 100ml of chlorinated hydrocarbon-contaminated groundwater containing indigenous dehalogenated bacteria from the actual site, add 2g of the prepared compound agent under nitrogen protection, seal it in a dark place, and use a multi-parameter water quality analyzer to monitor the oxidation-reduction potential (ORP) of the water body. ), dissolved oxygen (DO) and pH changes. The results showed that ORP dropped from 200mV to -400mV within one week, DO dropped below 1p...

Embodiment 2

[0041] The chlorinated hydrocarbon polluted groundwater area of ​​a chemical plant is selected as the pilot test site. The target aquifer for restoration is located at the ground level -15m to -17m. The pilot test restoration area is 10m×10m. From northwest to southeast, with a water content of 30%, a total of 9 drug injection points and two monitoring wells are evenly arranged. The previous sampling and analysis results showed that the types of chlorinated organic pollutants in the groundwater in this area were complex, and those with high content mainly included: 1,1-dichloroethane (34.0%), vinyl chloride (26.9%), 1,1,2- Trichloroethane (18.2%), cis-1,2-dichloroethylene (9.8%), 1,2-dichloroethane (2.6%), etc., and their concentrations do not exceed 500ppb, which are low-concentration refractory Contaminated sites, but all exceeded the V-level water quality standard for groundwater. At the same time, various physical and chemical parameters of the groundwater were tested, am...

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PUM

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Abstract

A zero-valent iron and biochar composite chemical for in-situ remediation of groundwater contaminated with chlorinated hydrocarbons is prepared from materials in percentage by weight as follows: 5%-30% of zero-valent iron powder, 8%-30% of a biochar source, 35%-85% of water, 0.1%-1% of a stabilizer, 1.5%-3% of a thickener, 0.3%-1% of an emulsifier and 0.01%-0.1% of a micronutrient source. The required raw materials are uniformly mixed by mixing equipment with high shearing for 15-30 min, and composite slurry which has good fluidity, is conducive to in-situ injection and can be stably stored is obtained. The prepared zero-valent iron and biochar source composite chemical has excellent fluidity and migration and diffusion capabilities and has a good remediation effect on complex contaminated sites containing both unsaturated and saturated chlorinated hydrocarbons. Besides, the selected raw materials are economic and available, the cost of the chemical is greatly reduced, and large-scale remediation of actual sites is facilitated.

Description

technical field [0001] The invention relates to the technical field of in-situ remediation of groundwater polluted by chlorinated hydrocarbons, in particular to a micron zero-valent iron bio-carbon source compound agent that facilitates in-situ injection. Background technique [0002] Chlorinated hydrocarbon pollutants are an important class of volatile and refractory organic compounds, many of which are considered to have carcinogenic, teratogenic, and mutagenic effects. Restricted by analysis technology and economic level, my country pays late attention to chlorinated hydrocarbon-contaminated sites, and is different from foreign countries. Among the organic pollutants that are frequently detected in groundwater in China and exceed the standard, saturated chlorinated hydrocarbons are difficult to degrade. Hydrocarbons occupy a considerable proportion, which greatly affects the quality of drinking water for people in polluted areas. In 1994, Gillham and O'Hannesin's pioneeri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/36
CPCC02F3/347C02F2101/36
Inventor 吴乃瑾魏文侠宋云孙仲平郭鹏李佳斌王海见张骥
Owner 北京市科学技术研究院资源环境研究所
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