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Soil ectopic washing remediation technology can efficiently treat various pollutants such as heavy metals, organic matter, and cyanide. It can be used in combination with other remediation technologies, and can be classified and cleaned according to the physical condition of the treated soil and the

Soil ectopic washing remediation technology can efficiently treat various pollutants such as heavy metals, organic matter, and cyanide. It can be used in combination with other remediation technologies, and can be classified and cleaned according to the physical condition of the treated soil and the purpose of secondary use. However, this technology also faces some technical barriers, mainly in the following aspects:

Costs and risks of soil excavation and transportation. Ex-situ washing needs to excavate the contaminated soil first, which will increase the engineering volume and cost. At the same time, there are potential safety hazards in the transportation of contaminated soil, which may cause leakage or scattering on the way and affect the surrounding environment.

Selection and recycling of eluents. Different pollutants need to choose different washing agents, and some washing agents may cause changes in soil pH, decline in soil fertility, and poor biodegradability. The washing waste liquid and the pollutants it carries need to be properly treated to avoid secondary pollution to soil and groundwater.

Effect of soil texture on washing performance. When the content of sand and gravel in the polluted soil exceeds 50%, or the content of humus is high, the separation and removal effect of ex-situ soil washing technology is poor. At this time, it is necessary to pre-treat the soil texture, such as crushing, hydrocyclone, etc., which increases the processing cost and time.

Difficulty and standard of soil backfilling or removal. The cleaned soil after ectopic washing needs to be backfilled or transported to other locations, which requires consideration of the flatness, stability, permeability and other factors of the site. At the same time, it is necessary to formulate quality standards and testing methods for clean soil to ensure that it meets the requirements for secondary use or disposal.

To sum up, the technical barriers currently faced by soil ectopic washing remediation technology mainly include soil excavation and transportation, washing agent selection and recovery treatment, soil texture, soil backfilling or transportation, etc. To break through these technical barriers, we need to start from the following aspects:

Optimize the scheme and equipment of soil excavation and transportation, reduce engineering volume and cost, improve safety and efficiency, and reduce damage to soil and environment.

Develop more efficient, more environmentally friendly, and more economical eluents, improve their selectivity and affinity for pollutants, and reduce their adverse effects on soil and the ecological environment.

The soil washing equipment developed by Desen Environmental has enhanced the effect of washing agents and pollutants, and improved soil permeability and washing effect.

Strengthen the recovery, treatment and reuse of the washing waste liquid, remove or recycle the pollutants in the washing waste liquid, and reduce the waste liquid discharge and treatment cost.

Establish a more scientific, accurate, and practical washing model and evaluation system to predict and evaluate the migration, distribution, and removal of pollutants during the washing process, and guide the formulation and optimization of washing programs.

Develop more reasonable, uniform, and operable clean soil quality standards and testing methods to ensure that they meet the requirements for secondary use or disposal, and avoid resource waste or environmental risks.

Desen Environment, as a professional comprehensive service provider integrating R&D, manufacturing and operation of soil washing and restoration equipment in China, not only optimized the original skid-mounted modular washing equipment, but also launched a mobile soil washing and restoration station to meet the various needs of customers.