The restoration and treatment of chromium slag contaminated soil is urgent
According to preliminary investigations, the total stockpile of chromium slag in my country currently exceeds 6 million tons, scattered in more than 80 locations in more than 20 provinces and cities. After decades of rainwater erosion and infiltration, the chromium slag storage sites have been serio
According to preliminary investigations, the total stockpile of chromium slag in my country currently exceeds 6 million tons, scattered in more than 80 locations in more than 20 provinces and cities. After decades of rainwater erosion and infiltration, the chromium slag storage sites have been seriously polluted. According to estimates by relevant experts, the amount of soil that has been seriously polluted by chromium slag and must be treated is estimated to be between 4 million tons and 10 million tons. For chromium slag contaminated sites, the Outline of the Eleventh Five-Year Plan for National Economic and Social Development of the People's Republic of China lists the treatment of chromium slag and its contaminated soil as a key environmental governance project, and it is urgent to carry out the remediation of chromium slag contaminated soil.
Soil washing technology has the advantages of no need to dig the soil, low treatment cost, small secondary pollution, and fundamental removal. As early as 1992, the first large-scale soil chemical washing technology project has been successfully used in the United States. Therefore, soil washing has great development potential in heavy metal soil remediation. At present, my country has made some progress in soil heavy metal washing and remediation, but there are still many problems. Now many studies on soil washing are more focused on several common heavy metals, such as Cu, Zn, Pb, Cd, etc., while there are fewer studies on Cr washing. In terms of soil washing technology, domestic and foreign scholars have discussed the washing efficiency of heavy metals in soil by inorganic acids, salts, surfactants, etc. However, traditional washing agents such as EDTA are not easy to degrade in the environment, or produce secondary pollution problems. In addition, a large amount of heavy metal-containing washing liquid produced after chemical washing is prone to secondary pollution and requires further treatment.
Zhengzhou Desen Environment, as a professional Chinese environmental protection equipment comprehensive service provider integrating R&D, manufacturing, and operation services, as a "pioneer" in the soil washing and remediation industry, Desen soil washing equipment includes skid-mounted modular and mobile types. It is an effective equipment to solve the problem of heavy metal contaminated soil remediation, and can achieve the maximum reduction of contaminated soil. Comprehensive treatment.
Toxic and harmful pollutants in the soil are converted into harmless substances. Not only is the treatment efficiency high, but secondary pollution is avoided as much as possible. At present, Desen washing equipment has participated in the standard remediation of nearly 100 heavy metal contaminated soil washing and remediation projects in China, such as the Qinghai arsenic pollution project, the Shanghai Putuo chemical site remediation project, the Changsha chromium salt plant remediation project, the Hangzhou Steel washing and remediation project, the Guangzhou Shipyard washing and remediation project, the Mahe Steel washing project, the Ningbo Fenghua washing project and other representative domestic comprehensive remediation projects, with a total soil washing treatment volume of more than 1 million tons.
Chromium slag contaminated sites have been listed as key targets for soil pollution control in my country, and it is urgently necessary to develop key technologies for the remediation of chromium slag contaminated soil. washing technology has great application potential in the remediation of contaminated soil. Desen soil washing equipment is an important soil remediation equipment with the characteristics of high pollutant removal rate, short remediation cycle, and no secondary pollution. Desen Environment used soil washing remediation technology at a chromium contaminated site in Shandong. After using soil washing equipment for remediation, all pollution factors of the soil in the chromium contaminated site met the control value requirements of GB 36600-2018, and the removal rate of each pollution factor was above 60%, with good remediation effect.