In-situ chemical oxidation remediation method of contaminated soil and groundwater with two-liquid shallow stirring

Abstract

The invention provides an in-situ chemical oxidation remediation method for polluted soil and groundwater double liquid shallow layer stirring, and belongs to the technical field of polluted soil and groundwater remediation methods. The method of the present invention comprises the following steps: (1) site leveling, measuring partitions; (2) surface crushing and screening, setting cofferdams; (3) assembling shallow mixing equipment and debugging; (4) medicament configuration: No. 1 dispensing station Configure oxidant, No. 2 dispensing station configures catalyst + slow release agent + pH regulator to form a double-liquid dispensing system; (6) Double-liquid dosing and shallow mixing construction for No. 1 and No. 2 dispensing stations; (7) ) surface curing; (8) chemical reaction and monitoring; (9) self-inspection and acceptance. The invention adopts the stirring equipment of excavator + professional stirring head and the double-liquid dispensing system, which can realize in-situ stirring while adding the medicament solution, has a short reaction cycle, and can solve the shallow pollution problem of soil and groundwater.

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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