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A slow-release composite restoration material for treating chlorine-containing organic pollutants in groundwater and its preparation method

A technology for organic pollutants and composite repair, which is applied in the field of slow-release composite repair materials and its preparation, can solve the problems of easy agglomeration and oxidation of medicinal powder, blockage of release amount, short action time, etc., and achieves improved long-term effect, good barrier effect, Remove the best effect

Active Publication Date: 2016-09-07
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 long-acting slow-release and easy-to-operate solution for the problems of short action time, secondary pollution, easy aggregation, oxidation and blockage of the powder, and difficulty in controlling the release amount of the existing chlorine-containing organic-contaminated groundwater restoration materials. Low-cost, environmentally friendly slow-release composite restoration material for treating chlorine-containing organic pollutants in groundwater and preparation method thereof

Method used

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  • A slow-release composite restoration material for treating chlorine-containing organic pollutants in groundwater and its preparation method
  • A slow-release composite restoration material for treating chlorine-containing organic pollutants in groundwater and its preparation method
  • A slow-release composite restoration material for treating chlorine-containing organic pollutants in groundwater and its preparation method

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Effect test

Embodiment 1

[0051] 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:

[0052] (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;

[0053] (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

[0056] 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:

[0057] (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;

[0058] (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

[0061] 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:

[0062] (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;

[0063] (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 slow-release compound repair material for treating chlorine-containing organic pollutants in groundwater and a preparation method thereof. The preparation method comprises the steps of (1) preparing biochar by high-temperature pyrolysis; (2) pretreating zero-valent iron by acid pickling; and (3) adding water into the biochar, adding xanthan gum and an organic carbon source, adding zero-valent iron finally, and carrying out multi-step treatment on the obtained mixture so as to obtain a slow-release compound repair material for treating chlorine-containing organic pollutants in groundwater. According to the invention, by using the xanthan gum with high mechanical strength and strong mass transfer performance as a novel slow-release embedding agent, the biochar (as a physical adsorbent), the zero-valent iron (as a chemical reductant) and the organic carbon source (as a biological reductant) which are taken as effective components are compositely embedded so as to form constitutionally stable gel microspheres, and the slow-release compound repair material has the advantages of long-term slow-release, easy operation, low cost, environment friendliness, and the like, and can effectively realize the physical, chemical and biological synergistic reinforced repair, therefore, the material can remove target pollutants more efficiently.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted groundwater, and relates to a slow-release composite remediation material for treating chlorine-containing organic pollutants in groundwater and a preparation method thereof. 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), ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/00B01J20/22B01J20/30C02F101/36C02F103/06
Inventor 孟梁吴晴雯郭琳杨洁吉敏张施阳陈彩成
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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