Periodic composite repair method of arsenic polluted soil

Abstract

The invention belongs to the technical field of soil restoration, and in particular relates to a periodic composite repair method of arsenic polluted soil, the periodic composite repair method includes the following steps: ciliate desert-grass is transplanted for preparation and formation of a repair layer, meanwhile the soil is electrochemically repaired, after one period of the repair, the ciliate desert-grass is harvested for testing, and completed repair or re electrochemical repair or the natural repair is determined according to the test results. Every steps in the method are closely linked, by the manner of determination of periodic circulation on the basis of the detection value, unnecessary time and cost waste can be avoided, repair equipment arrangement is compact, soil and electrode chamber PH can be regulated in real time, the ratio of an acid and alkali liquid tank can be regulated by an automatic control device, the stability is high, flexibility is strong, according to the testing results, periodic circulation manner is changed, arsenic is repaired completely, and finally more than 98% of the arsenic can be repaired.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a variable periodic composite repair method for arsenic-contaminated soil. Background technique [0002] my country is one of the countries with serious arsenic pollution. In addition to chemical and agricultural production, arsenic pollution also comes from chemical weapons abandoned and buried in the ground after the Japanese invasion of China after World War II. Arsenic is a carcinogenic and teratogenic element. Pollution of water and soil will pose a huge threat to humans and the ecological environment. Therefore, various researches on arsenic removal have been carried out earlier in my country. [0003] Commonly used remediation techniques for arsenic-contaminated soil mainly include the following: [0004] 1. Stable solidification method: first analyze the pollution degree of the pollutants to be treated, and then mix the targeted treatment agents, mix...

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Problems solved by technology

[0010] The object of the present invention is to provide a method for periodic composite repair of arsenic-contaminated soil, to solve the problems of low repair efficiency, large investment, poor repair effect, and poor adaptability in the above soil repair, and to solve the problem of arsenic-contaminated soil in a targeted manner. Arsenic pollution problem

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