On the role of chemical washing remediation technology in the treatment of chromium-contaminated sites

  • Jun 06.
  • DesenGroup.
  • 38 visits
铬污染主要来源于铬化工、制革和电镀等工业活动,这些行业产生的废弃物中含有高浓度的六价铬,对生态环境和人类健康构成严重威胁。六价铬因其强氧化性、致突变、致癌和致畸效应而被美国环保署和中国环保部门列为优先控制的重点污染物。土壤中的六价铬含量可能高达10000mg/kg以上,远超国家安全标准,且污染深度可达10米以上

Chromium pollution mainly comes from industrial activities such as chromium chemicals, leather making and electroplating. The waste generated by these industries contains high concentrations of hexavalent chromium, which poses a serious threat to the ecological environment and human health. Hexavalent chromium has been listed as a key pollutant for priority control by the US Environmental Protection Agency and China's environmental protection department due to its strong oxidizing, mutagenic, carcinogenic and teratogenic effects. The hexavalent chromium content in the soil may be as high as 10,000 mg/kg or more, far exceeding the national safety standard, and the pollution depth can reach more than 10 meters, which also causes serious pollution to groundwater.

Chemical washing remediation technology injects or mixes specific chemical eluents into the contaminated soil, and uses the chemical reaction between the eluent and the pollutant to dissolve heavy metals such as chromium from the soil. This technology includes two methods: in-situ soil washing and ex-situ soil cleaning. In-situ washing is to inject the eluent directly into the soil, while ex-situ cleaning is to dig out the contaminated soil and treat it externally. After washing, the chromium-containing waste liquid is extracted and further treated to ensure the safety of the soil and groundwater.

On the role of chemical washing remediation technology in the treatment of chromium-contaminated sites

Desen Environmental's integrated soil washing equipment is compactly designed, easy to transport and quickly deployed, and suitable for remediation operations at different chromium-contaminated sites. The equipment adopts a modular design, and can flexibly adjust the type and amount of washing agents according to the pollution situation and soil type to achieve customized remediation. Desen's integrated soil washing equipment has high removal efficiency and short remediation cycle. It can significantly reduce the chromium content in the soil in a short time and meet strict environmental standards. No secondary pollution is generated during the operation of the equipment, which meets the current environmental protection requirements and has good environmental benefits.

At a chromium-contaminated site in Shandong, Desen Environmental used its integrated soil washing equipment for remediation operations. After remediation, all pollution factors in the soil met the control value requirements of GB 36600-2018, and the removal rate was above 60%, showing a good remediation effect. This case proves the efficiency and reliability of integrated soil washing equipment in actual remediation projects, and provides an effective reference for the remediation of similar hexavalent chromium-contaminated sites.

With the strengthening of environmental protection requirements and the improvement of public health awareness, chemical washing technology will be more widely used in the field of soil remediation. Technological innovation and cost control will be key factors in promoting the development of chemical washing technology, including the development of more efficient washing agents and the improvement of equipment automation level. International cooperation and experience exchange will also promote the application and development of chemical washing technology on a global scale.

In summary, it can be seen that integrated soil washing equipment plays an important role in the remediation of chromium-contaminated soil. Chemical washing technology has become an effective means to solve the problem of soil chromium pollution with its high removal rate, flexible application methods and good environmental adaptability. With the continuous advancement of technology and the expansion of application fields, chemical washing technology will play a more critical role in future soil remediation work.

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