Compound eluting agent for repairing organic matter and heavy metal compound contaminated soil, leaching method of compound eluting agent and eluting agent recycling process

Abstract

The invention discloses an eluting agent for repairing organic matter and heavy metal compound contaminated soil, an eluting method of the compound eluting agent and an eluting agent recycling method,wherein the eluting agent is prepared by compounding Tween 80 and EDTA. The eluting method comprises the following steps: adding the eluting agent into the contaminated soil, oscillating, mixing, centrifugally separating an eluting solution, adding the compound eluting agent solution again into the soil subjected to first-time eluting, performing secondary elution, and repeating for four times. The eluting agent recycling method comprises the following steps: transferring the separated eluting solution into a photoelectric recovery device, adding sodium persulfate and sodium sulfate electrolytes, turning an ultraviolet lamp and a power supply for photoelectric treatment for 2.5 hours to selectively degrade organic matters in the eluting solution and recover heavy metals. The compound solution of the Tween 80 and EDTA-2 Na is used, a plurality of times of continuous eluting are carried out, a photoelectric synergistic persulfate method is adopted to regenerate the eluting agent, and the organic matter and heavy metal compound contaminated soil can be effectively repaired synchronously. The method has the characteristics of simple process, convenience operation, short time consumption, high efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a compound leaching agent for remediating soil compounded with organic matter and heavy metals, a leaching method, and a leaching agent recovery process. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the total exceeding rate of soil pollution in the country is 16.1%, and the main pollutants are inorganic substances such as chromium, cadmium, nickel, copper, arsenic, mercury, Lead, zinc, etc., the over-standard rates of these heavy metals were 11.0%, 7.0%, 4.8%, 2.7%, 2.1%, 1.6%, 1.5%, and 0.9% respectively; the main organic pollutants were DDT, polycyclic aromatic hydrocarbons and Liuliuliu, the point exceeding rate was 1.9%, 1.4%, and 0.5% respectively. [0003] With the continuous advancement and development of China...

AI Technical Summary

Problems solved by technology

[0007] So far, although there have been reports on heavy metal-organic complex polluted soil, there are not many such reports, especially the report on the combination of chemical leaching and other methods to recover eluate

The in-situ repair method usually takes a few days or even dozens of days, which is long and inefficient; it requires high equipment, high operation and maintenance costs, and the repair materials used are difficult to reuse, and even cause damage during operation. Secondary pollution

Images