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Heavy metal pollution in soil has the characteristics of high toxicity, wide impact range, long impact time and strong harmfulness. It is a kind of inorganic pollution. The above characteristics of heavy metal contaminated soil are due to the inability of microorganisms to degrade heavy metal ions i

Heavy metal pollution in soil has the characteristics of high toxicity, wide impact range, long impact time and strong harmfulness. It is a kind of inorganic pollution. The above characteristics of heavy metal contaminated soil are due to the inability of microorganisms to degrade heavy metal ions in the soil, so that the organisms in the soil will absorb these heavy metal ions, and over time, these heavy metals will continue to accumulate in the organisms in the soil and transform into toxic methyl compounds. At present, in the research field of remediation of contaminated soil in my country, it is no longer a single remediation of contaminated soil, but more focus on the simultaneous remediation and resource utilization of contaminated soil, which has become a very important research direction.

Soil washing remediation technology is a method of mixing water or solution with contaminated soil, transferring harmful substances in the soil from the solid phase to the liquid phase through complex processes such as precipitation, ion exchange, chelation or adsorption, and then further separating and treating the pollutants in the washing solution. The determining factors of the remediation effect of chemical washing technology are the selection of washing agents, the evaluation of soil properties and the adjustment of washing conditions. These factors work together in the remediation process to achieve the best effect.

The use of acidic washing agents can effectively remove heavy metals from soil, but it causes great damage to the physical and chemical properties of the soil, making it difficult to reuse and generating a large amount of sewage. At present, the washing agents used by countries around the world for soil pollutant extraction and elimination include strong acid or alkaline solutions, synthetic chelating agents, organic acids, humus, surfactants, cyclodextrins, etc. Chemical washing treatment processes are generally used to repair heavy metal pollutants. They have a wide range of applications and strong technical adaptability, and also show good results in the washing and remediation of heavy metal pollutants such as As, Hg, and Ni.

Desen's integrated soil washing equipment can be used for washing and remediation operations of various polluted sites such as chemical smelters, organic contaminated sites, former gas station sites, and heavy metal contaminated sites. It is suitable for washing operations of clay-like insoluble soils; the on-site washing effects of several soil washing and remediation projects show that the washing and remediation equipment can achieve the target value after the contaminated soil is remediated. The supporting capacity range can reach 10-100 tons/hour, which can meet the requirements of multi-capacity projects. Customized process design and equipment matching are carried out according to sample data such as pollution indicators of customer remediation projects. It can realize PLC intelligent control of the whole process from feeding metering, scrubbing and grading, efficiency-enhancing washing, to mud concentration, mud filtration, etc. In addition, Desen's integrated washing equipment can be upgraded and updated according to the actual needs of customer projects. There are docking interfaces between modules, and modules can be added or subtracted at any time according to project needs. Everything is guided by customer needs!

At present, the main directions of resource utilization of heavy metal contaminated soil are soil utilization, building material processing and roadbed filling, among which brick making and ceramsite making are the key research contents today. However, due to the complex and changeable physical properties of heavy metal contaminated soil, high heavy metal content, complex production process and low social acceptability, the comprehensive utilization rate is low and the problem of secondary pollution still exists. It is necessary to conduct in-depth research on the migration and diffusion risks of heavy metals in its resource utilization process.