Method for degrading heavy non-aqueous phase liquid component composite hydrochloric ether pollutants in underground water

Abstract

Provided is a method for degrading heavy non-aqueous phase liquid component composite hydrochloric ether pollutants in underground water. The steps are as follows: a mixture of sodium persulfate and sodium hydroxide is added into water containing composite hydrochloric ether pollutants, and degradation and restoration are carried out. The cost is low, and operation is simple, safe and practicable. The restoration reagent has stable chemical properties, the reaction conditions are mild, and the restoration reagent has universality in most of underground environments. Various hydrochloric ether kinds can be degraded, and have a representativeness of pollution of underground water by composite hydrochloric ether. The method has characteristics of high degradation efficiency, rapid degradation rate, nontoxic products and the like. The method is suitable for in-situ restoration of underground water composite hydrochloric ether pollutants, can be extended for restoration composite hydrochloric ether in soil or industrial waste water, and is widely applied.

Description

technical field [0001] The invention relates to a degradation repair technology for heavy non-aqueous liquid pollution in groundwater, in particular to a method for oxidizing and degrading heavy non-aqueous liquid components in groundwater with compound chlorinated hydrocarbon pollution by alkali-activated persulfate. Background technique [0002] Dense non-aqueous phase liquids (Densenon-aqueous phase liquids, DNAPLs) are water-insoluble hydrocarbons with a specific gravity greater than 1 that exist below the surface of the earth, including some organic compounds containing one or more chlorine, bromine or fluorine atoms. Most chlorinated hydrocarbons are common components of heavy non-aqueous liquids, which are characterized by high volatility, low water solubility, refractory degradation and low viscosity. As an important organic solvent, intermediate and chemical raw material, chlorinated hydrocarbons have been widely used in the production of pesticides, tanning, phar...

AI Technical Summary

Problems solved by technology

This method has the advantages of fast reaction speed and complete degradation, but sometimes the reaction is violent and difficult to control, the reaction conditions are relatively harsh, and improper handling will cause secondary pollution

[0015] Due to the different degrees of difficulty in degrading chlorinated hydrocarbons in groundwater, such as carbon tetrachloride and tetrachlorethylene, it is difficult to degrade them. So far, there is still no complete, effective and unified method that can simultaneously degrade tetrachlorethylene and trichloride in groundwater. Pollution of ethylene, carbon tetrachloride, chloroform and 1,1,2-trichloroethane complex chlorinated hydrocarbon pollutants