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A method for treating chlorine-containing organic pollutants in groundwater with slow-release composite restoration materials

A technology for organic pollutants and composite restoration, which is applied in the field of slow-release composite restoration materials for the treatment of chlorine-containing organic pollutants in groundwater, and can solve the problems of easy agglomeration and oxidation of medicinal powder, blocking release, short effect of restoration materials, and secondary pollution. , to achieve the effect of improving long-term effect, low cost and slowing down the oxidation process

Active Publication Date: 2016-08-17
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a controllable long-acting slow-acting method for the problems of short-acting remediation materials, secondary pollution, easy aggregation, oxidation and clogging of medicinal powders, and difficult control of release volume in the existing chlorine-containing organic-contaminated groundwater treatment. Method for treating chlorine-containing organic pollutants in groundwater with a slow-release composite restoration material that is easy to release, has no secondary pollution, is not easy to agglomerate, oxidize and clog, is low in cost, and is environmentally friendly

Method used

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  • A method for treating chlorine-containing organic pollutants in groundwater with slow-release composite restoration materials
  • A method for treating chlorine-containing organic pollutants in groundwater with slow-release composite restoration materials
  • A method for treating chlorine-containing organic pollutants in groundwater with slow-release composite restoration materials

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Embodiment 1

[0050] Such as figure 1 Shown, a kind of preparation method of the slow-release composite restoration material that the present invention is used to process chlorine-containing organic pollutants in groundwater, the steps are as follows:

[0051] (1) Preparation of physical adsorbent biochar: Wash the rice straw, put it in an oven at 60°C for overnight drying, crush the dried rice straw, put it into a crucible for compaction, and put it in a closed muffle furnace for high-temperature oxygen-limited heating solution (by figure 2 Pyrolysis heating program, first raise the temperature to 100°C for 1.0h, then raise the temperature to 500°C for 2h at 5°C / min) to obtain biochar; pass the obtained biochar through a 120-mesh sieve, put it into a brown jar and seal it for storage stand-by;

[0052] (2) Pretreatment chemical reductant zero-valent iron: put zero-valent iron powder with a particle size of 200 mesh in 2% hydrochloric acid solution, acidify for 5 minutes, rinse with deio...

Embodiment 2

[0055] Such as figure 1 Shown, a kind of preparation method of the slow-release composite restoration material that the present invention is used to process chlorine-containing organic pollutants in groundwater, the steps are as follows:

[0056] (1) Preparation of physical adsorbent biochar: Wash the edible fungus slag, put it in an oven for drying overnight at 40°C, crush the edible fungus slag, put it into a crucible for compaction, and put it in a closed muffle furnace for high-temperature oxygen-limited heating solution (by figure 2 Pyrolysis heating program, first raise the temperature to 100°C for 2h, then raise the temperature to 250°C for 4h at 10°C / min) to obtain biochar; pass the obtained biochar through a 50-mesh sieve, put it into a brown jar and seal it for storage until use;

[0057] (2) Pretreatment chemical reductant zero-valent iron: put zero-valent iron powder with a particle size of 100 mesh in 0.5% hydrochloric acid solution, acidify for 8 minutes, rins...

Embodiment 3

[0060] Such as figure 1 Shown, a kind of preparation method of the slow-release composite restoration material that the present invention is used to process chlorine-containing organic pollutants in groundwater, the steps are as follows:

[0061] (1) Preparation of physical adsorbent biochar: Wash the rice husk, put it in an oven at 70°C for overnight drying, crush the rice husk, put it into a crucible for compaction, and put it in a closed muffle furnace for high-temperature oxygen-limited pyrolysis ( according to figure 2 Pyrolysis heating program, first raise the temperature to 100°C and keep it for 1.5h, then raise the temperature to 750°C at 20°C / min and keep it for 6h) to obtain biochar; pass the obtained biochar through a 150-mesh sieve, put it into a brown jar and seal it for storage stand-by;

[0062] (2) Pretreatment chemical reducing agent zero-valent iron: put zero-valent iron powder with a particle size of 400 mesh in 3% hydrochloric acid solution, acidify for ...

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Abstract

The invention discloses a method for treating chlorinated organic pollutants in underground water by using a slow-release compound repair material. The method comprises the following steps: (1), preparing charcoal through high temperature pyrolysis; (2), pre-treating zero-valent iron through acid pickling; (3), adding water into the charcoal, then adding xanthan gum and an organic carbon source, and finally, adding zero-valent iron, and through steps of treating, obtaining the slow-release compound repair material; then treating chlorinated organic pollutants in underground water by adopting an in situ injection repairing method or an in situ PRB repairing method. According to the method provided by the invention, the xanthan gum with high mechanical strength and strong mass transfer performance is used as a novel slow release embedding medium, the physical adsorbent charcoal, the chemical reductant zero-valent iron and the bioreductive drug organic carbon source are taken as effective components for composite embedding, so that gel microspheres with stable structures are formed, and the method provided by the invention has the advantages of sustained release, simple and convenient operation, low cost, environment friendliness and the like, can effectively achieve physically, chemically and biologically collaborated and enhanced remediation, and can effectively remove target pollutants.

Description

technical field [0001] The invention belongs to the technical field of restoration of polluted groundwater, and relates to a method for treating chlorine-containing organic pollutants in groundwater with a slow-release composite restoration material. Background technique [0002] With the development of industry and agriculture in my country and the widespread use of chemical products, a large number of artificially synthesized organic compounds enter the underground environment through various channels, causing organic pollution of groundwater (such as polycyclic aromatic hydrocarbons, chlorinated hydrocarbons, polychlorinated biphenyls, petroleum hydrocarbons, etc. ) is getting worse. Chlorinated organic pollutants, such as chlorinated hydrocarbons, polychlorinated biphenyls, and organochlorine pesticides, which are ubiquitous in groundwater are refractory, highly bioaccumulative, and have "three-cause" effects (carcinogenic, teratogenic, and mutagenic), which will It will...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/00B01J20/22B01J20/30
Inventor 孟梁吴晴雯杨洁郭琳王旌张施阳
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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