Remediation method for organic matter contaminated soil

Abstract

The invention provides a remediation method for organic matter contaminated soil. The remediation method comprises the following steps that 1, soil pretreatment; 2, continuous leaching of the soil; step 3, degradation of organic pollutants and recovery of heavy metals; and step 4, soil micro-ecological restoration. According to the invention, an elution method and a biological mud method are combined; firstly, a soil dispersing agent is mixed with the soil; soil aggregation and cementation in the leaching process are avoided; the leaching speed is increased by adopting a continuous leaching mode; meanwhile, the leaching effect is improved by compounding and combining the leaching agents; through the arrangement of tan electrostatic spinning composite filter felt, the cyclic utilization ofleacheate is realized; during soil micro-ecological restoration, an immobilized mixed degradation microbial inoculum is adopted, organic pollutants which are not eluted by leacheate and surfactants adsorbed in the soil can be degraded within 2-4 days by controlling the ventilation capacity and the stirring rate, the restoration time is short, the cost is low, the restored soil does not need to besubjected to subsequent treatment and can be directly sown, and the economic benefit is good.

Description

technical field [0001] The invention relates to the technical field of soil pollution remediation, in particular to a method for remediating organic-contaminated soil. Background technique [0002] The current treatment method for organic-contaminated soil is to excavate the soil and carry out follow-up treatment, including landfill, incineration, leaching, adsorption, ultrasonic, microwave, biological treatment, etc. The landfill method is simple but expensive, and the pollutants still remain in the soil; the incineration method has complex equipment, high energy consumption, high cost, and secondary pollution of harmful gases and residual ash; adsorption, ultrasonic, microwave The purification effect is not ideal, the biological method has a long treatment cycle, and the treatment effect is not ideal; the leaching method is easy to operate and has high treatment efficiency, but there are problems of low miscibility between most organic substances and eluents, and the consu...

AI Technical Summary

Problems solved by technology

The landfill method is simple but expensive, and the pollutants still remain in the soil; the incineration method has complex equipment, high energy consumption, high cost, and secondary pollution of harmful gases and residual ash; adsorption, ultrasonic, microwave The purification effect is not ideal, the biological method has a long treatment cycle, and the treatment effect is not ideal; the leaching method is easy to operate and has high treatment efficiency, but there are problems of low miscibility between most organic substances and eluents, and the consumption of eluents is large , Disposal of leaching waste liquid, time-consuming waste liquid treatment, secondary pollution of soil by leaching agent, etc.

[0003] In existing soil remediation, when using the leaching method to remove organic pollutants in the soil, the leaching solution is first mixed with the soil, and then stirred for a certain period of time to allow the two to fully react before standing still, and finally the leaching solution is separated. It takes a long time, because the separation of the eluent requires a large amount of eluent at one time, and a considerable part of the eluent components in the eluent waste liquid are not combined with the pollutants, resulting in waste of reagents, and the eluent waste liquid The follow-up treatment is also relatively difficult, and it needs to be sent to the relevant sewage treatment plant or further degrade or adsorb the organic pollutants in the leaching waste liquid, and then treat the heavy metals

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