Method for treating tetrachloromethane-containing groundwater

Abstract

The invention discloses a method for treating tetrachloromethane-containing groundwater. The method comprises the following steps: tetrachloromethane-containing groundwater enters a separating tower from a high-position treating water inlet in the tower wall to flow to a tower plate at the top layer, and simultaneously, aeration treatment on high temperature air entering tower plates from a vapor inlet and a gas inlet through aerators is realized; water overflowing the tower plate at the first layer passes an overflow dam to enter a tower plate at the next layer to be subjected to aeration treatment, and the operation is repeated till the water falls into a liquid storage tank; water which is positioned at the upper part of the liquid storage tank and reaches the standard is discharged through a standard water outlet; water at the lower part of the liquid storage tank returns to the tower plate at the first layer to be subjected to aeration treatment through a return pipe, wherein part of tetrachloromethane gas generated in the reaction process enters a distributor in a buffer area through a gas rising pipe in the buffer area, and is discharged to a condensing recovery room through the distributor, and the other gas generated in the reaction process enters the condensing recovery room after passing all layer of the tower plates. According to the method, layered aeration is adopted to remove tetrachloromethane from water; through the distributor and the buffer area, the gas and water separation is facilitated, so that the remove effect is further improved.

Description

technical field [0001] The invention belongs to an environmental protection treatment technology and relates to a treatment method for underground water containing carbon tetrachloride. Background technique [0002] Carbon tetrachloride (CCl 4 ) is a synthetic low-boiling organic chlorinated hydrocarbon (specific gravity 1.591g / cm 3 , boiling point 77°C), slightly soluble in water. Foreign studies have shown that carbon tetrachloride is a typical liver poison. When it is in high concentration, it will first affect the central nervous system, and then affect the liver and kidney. It has persistence, long-term residue and bioaccumulation in the environment. Therefore, it has been listed by the US EPA as "priority control pollutants in water containing carbon tetrachloride" since 1979, and it has also been included in my country's 68 " Priority pollutants in water" list. [0003] In the 1970s, due to the large-scale production and use of pesticides, groundwater in many areas...

AI Technical Summary

Problems solved by technology

[0013] However, due to the complex geological structure, when the injected air encounters a complete rock formation zone, a loose broken zone or a curved deformation zone, it is difficult for the injected air carrying volatile organic compounds to penetrate the above-mentioned geological structure, and when the injected air meets the above-mentioned geological structure, the air Large resistance will greatly increase the energy consumption of the equipment

It is even less effective for pollutants that are neither volatile nor biodegradable

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