Double-liquid shallow-mixing in-situ chemical oxidation repair method for contaminated soil and groundwater

Abstract

The invention provides a double-liquid shallow-mixing in-situ chemical oxidation repair method for contaminated soil and groundwater and belongs to the technical field of contaminated soil and groundwater repair methods. The method comprises the following steps of (1), site leveling and zone measuring, (2), surface crushing and screening and cofferdam building, (3), shallow mixing equipment assembling and debugging, (4), agentia dispensing, wherein an oxidizing agent is dispensed to a first dispensing station, a catalyst, an inhibiter and a pH modifier are dispensed to a second dispensing station, and a double-liquid dispensing system is formed; (6), adding and shallow mixing construction of the double kinds of liquid dispensed to the first dispensing station and the second dispensing station, (7), surface layer curing, (8), agentia reaction and monitoring and (9) self-inspection and acceptance. According to the method, mixing equipment with an excavator and professional mixing heads and the double-liquid dispensing system are adopted, in-situ mixing can be achieved while an agentia solution is added, the reaction period is short, and the problem of the shallow contamination of the soil and groundwater can be solved.

Description

technical field [0001] The invention relates to an in-situ chemical oxidation remediation method of contaminated soil and groundwater double liquid shallow layer stirring, and belongs to the technical field of remediation methods of polluted soil and groundwater. Background technique [0002] Volatile / semi-volatile organic pollution in soil and groundwater is one of the main forms of pollution in industrially polluted sites in my country. Organic pollution of shallow contaminated soil and groundwater is common, and ex-situ remediation technology is likely to cause secondary pollution due to excavation and transportation. Therefore, in-situ remediation technology is gradually favored. At present, the organic pollution of soil and groundwater mainly adopts physical, chemical and biological or combined techniques. The first problem to be solved in engineering restoration is how to effectively add remediation agents to the soil and groundwater environment. Stirring and infusion...

AI Technical Summary

Problems solved by technology

Injection well technology has the defects of serious leakage and uneven injection of chemicals for sites where the shallow polluted soil is dominated by miscellaneous fill soil

[0006] The Chinese invention patent with the patent number ZL201310413766.8 (application publication number CN103464455A, application publication date December 25, 2013) discloses "a method for chemical oxidation repair of organic polluted soil by compounding potassium permanganate and hydrogen peroxide" , is actually a method of ectopic chemical oxidation remediation of organically polluted soil by spraying the compound agent of potassium permanganate and hydrogen peroxide. High decomposition rate results in greater loss of chemicals

[0007] The invention patent with the patent number ZL201510108244.6 (application publication number CN104624634A, application publication date May 20, 2015) discloses "a chemical oxidation repair method for organic polluted soil" and the application number is 201410831123.x (application publication number CN104624629A, application publication date May 20, 2015)'s invention patent application discloses a patented technology of "a method for repairing organic-contaminated sites using a two-way stirring injection method". Adding agents such as oxidants and catalysts through drill pipes, the essence is deep Mixing technology, for shallow polluted soil and groundwater, there are defects such as excessive hole density and unsuitable drill bit mixing

The invention patent application with application number 201610464626.7 (application publication number CN105964678A, application publication date September 28, 2016) discloses "in-situ injection of soil and groundwater - high-pressure rotary spray injection in-situ repair system and method", mentioning high-pressure Rotary jet injection restoration process is suitable for the restoration of deep pollution. It requires pile foundation machinery as a mixing machine, and the assembly is relatively complicated. It is not suitable for the restoration of shallow soil and groundwater.

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