Method of wet detoxification combined with stabilization to remediate chromium-contaminated soil
A technology for chromium-contaminated soil and wet detoxification, applied in the field of wet detoxification combined with stabilization and restoration of chromium-contaminated soil, can solve problems such as affecting environmental safety, excessive hexavalent chromium, rebound, etc., to reduce solubility and promote chromium hydroxide effect of precipitation
Active Publication Date: 2015-11-18
WELLE ENVIRONMENTAL GRP CO LTD
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Problems solved by technology
Using the wet detoxification process to solve the problem of chromium-contaminated soil, although it is easy to achieve short-term detoxification effect, but the soil after wet detoxification will not undergo subsequent treatment, and there may be a rebound phenomenon in the long-term environment in the future, resulting in hexavalent Chromium once again exceeded the standard, affecting environmental safety
Especially in sites affected by chromium slag stacking, soil chromium pollution mainly exists in water-soluble and acid-soluble chromium, so the current common methods are difficult to meet the requirements of complete detoxification of chromium-contaminated soil
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[0021] The method for wet detoxification combined with stabilization and restoration of chromium-containing contaminated soil of the present invention comprises the following steps:
[0022] ⑴. Perform wet ball milling on the chromium-containing contaminated soil in a ball mill, and wet ball-mill the chromium-containing contaminated soil into a slurry at room temperature, so that the particles of the chromium-containing slurry are above 150 mesh, and the chromium-containing slurry The Baume degree is controlled at 40-60°Bé at room temperature, and the Baume degree of the chromium-containing slurry is preferably 45-55°Bé at room temperature. Add sodium sulfide reducing agent and mix evenly. The sodium sulfide reducing agent can be directly added to the ball mill. Or sodium sulfide reducing agent is added to the chromium-containing slurry, the reduction reaction is controlled within 1-2 hours, and the chromium-containing slurry is reduced to water-soluble hexavalent chromium, and...
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The invention relates to a method for restoring polluted chromium-containing soil by combining wet detoxification and stabilization. The method comprises the following steps of performing wet ball grinding on the polluted chromium-containing soil in a ball grinding machine, adding a sodium sulfide reducing agent and uniformly mixing, then performing reducing reaction to reduce water-soluble hexavalent chromium from chromium-containing slurry, adding inorganic acid into the chromium-containing slurry and uniformly mixing, adjusting the pH of the chromium-containing slurry to be 4-6, and dissolving out acid-soluble hexavalent chromium in the chromium-containing slurry; adding the reducing agent into the chromium-containing slurry with the adjusted pH, uniformly mixing the reducing agent and the chromium-containing slurry, performing secondary reducing treatment, controlling the reaction time within 2-4 hours, curing a product for 6-12 hours, reducing the acid-soluble hexavalent chromium in the chromium-containing slurry into trivalent chromium, performing solid-liquid separation on the chromium-containing slurry subjected to secondary reducing, and returning separated filtrate into the ball grinding machine; adding a stabilizing agent into the separated detoxified chromium polluted soil for stabilization. The method has the characteristics of good treatment effect, low operating cost, no secondary pollution and high adaptability.
Description
technical field [0001] The invention relates to a method for wet detoxification combined with stabilization and restoration of chromium-containing contaminated soil, and belongs to the technical field of heavy metal soil restoration. Background technique [0002] The main source of chromium pollution is the discharge of industrial chromium-containing waste gas, waste water and waste residue. Such as metal processing, ferrochrome smelting, electroplating, tanning, pigments, refractory materials and chemical industries. Chromium, as one of the five toxic elements, has a strong carcinogenic effect and poses a serious threat to people's environmental health. Among them, the toxicity of hexavalent chromium is far greater than that of trivalent chromium. Hexavalent chromium has strong carcinogenic and mutagenic properties, and is one of the 47 most hazardous wastes recognized internationally. [0003] Therefore, the control of soil pollution has received widespread attention. ...
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IPC IPC(8): B09C1/08
Inventor 廖书林尹贞马强宗韬李月中张进峰朱卫兵金慧宁
Owner WELLE ENVIRONMENTAL GRP CO LTD