Patent
Method for carrying out three-level remediation on heavy metal contaminated soil
Niu Xiaojun,Wang Caihong +1 more
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In this article, a method for carrying out three-level remediation on heavy metal contaminated soil is proposed, which comprises the steps of breaking a contaminated paddy field, irrigating the paddy fields until a water logging layer on a soil layer is 10-15cm deep after breaking the 0.5-0.6m deep soil on the surface layer into soil lumps with sizes less than 2-3mm.Abstract:
The invention discloses a method for carrying out three-level remediation on heavy metal contaminated soil. The method comprises the steps of breaking a heavy metal contaminated paddy field, irrigating the paddy field until a water logging layer on a soil layer is 10-15cm deep after breaking the 0.5-0.6m deep soil on the surface layer into soil lumps with sizes less than 2-3mm, adding a modified clay mineral adsorbent, mechanically stirring the adsorbent, standing for 6-8 hours, fishing out the adsorbent which floats on water and completes adsorption, and simultaneously discharging the supernatant, thus completing first-level remediation; then uniformly adding magnetic nano materials to the soil with adjusted moisture content, mechanically stirring the materials, standing for 3-8 hours, and collecting part of heavy metals in the soil by way of magnetic separation; preparing leachate for leaching, adding nano iron powder while leaching, and then, leaching 1-3 times by using pure water as an eluent, thus completing third-level remediation, wherein the amount of water used each time is 0.6-1 times the leachate added for the first time by volume. The method is simple to operate, is low in cost, has high removal efficiency, meets actual requirements, and has good popularization and application values.read more
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Preparation method of modified micron zero-valent iron and application method of modified micron zero-valent iron in remediation of heavy metal contaminated soil
TL;DR: In this article, a preparation method of modified micron zero-valent iron and an application method of the modified micro-iron in remediation of heavy metal contaminated soil is presented.
Patent
Method for improving stabilization efficiency of nanometer zero-valent iron in heavy metal composite polluted soil
Ying Rongrong,Xia Bing,Kong Lingya,Deng Shaopo,Wang Lei,Feng Yanhong,Zhang Ya,Zhao Xin,Zhang Xiaoyu,Wan Jinzhong,Xu Jian,Shan Yanhong +11 more
TL;DR: In this paper, a method for improving stabilization efficiency of nanometer zero-valent iron in a heavy metal composite polluted soil is presented, which comprises the following steps of (1) preparing for the modified nanometer zental iron; (2) stabilizing treatment of the modified n-v-ent iron; and (3) evaluating a stabilization effect; the method is characterized in that sodium carboxymethylcellulose is adopted to modify the nanometerzent iron.
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References
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In-situ restoration method for heavy metal polluted soil
TL;DR: In this article, an in-situ restoration method for heavy metal polluted soil, which comprises the following steps of: uniformly mixing submicron or nano iron, coal ash, a magnesium-containing preparation and bentonite in proportion by weight of (5-25): (40-50): (1-10): (15-50), was proposed.
Patent
Amine modified clay sorbents
TL;DR: Amine modified clay sorbents have particular application for the sorption of hydrophobic contaminants, particularly constituents of AFFFs, surfactants and/or perfluorinated or polyfluorinated compounds as mentioned in this paper.
Patent
Material for removing lead in heavy-metal soil leacheate as well as preparation method and application thereof
Yanshan Cui,Yu Fu +1 more
TL;DR: In this article, an iron-based bentonite material was proposed for removing lead in heavy-metal pollution soil leacheate, wherein the material is an iron based bentonite material and simultaneously provided a preparation method of the material and a method for removing the lead in the heavy metal soil leachate.