Fixed filler bed aeration stripping system used for removing groundwater carbon tetrachloride and method for removing groundwater carbon tetrachloride by using fixed filler bed aeration stripping system

Abstract

The invention discloses a fixed filler bed aeration stripping system used for removing groundwater carbon tetrachloride. The system comprises an aeration stripping pool, a fixed filler bed and an aeration system, wherein the multi-layer fixed filler bed is arranged inside the aeration stripping pool, and the aeration system is arranged at the bottom of the aeration stripping pool; the aeration system adopts a microporous aeration disk, and is connected with an external gas source through a gas inlet; a mechanical exhaust system and a tail gas collecting device are arranged at the top of the aeration stripping pool; a water inlet and a water outlet are respectively formed in the upper part and the lower part of the side wall of the aeration stripping pool; the fixed filler bed adopts reducing substance filler loaded with iron particles. The invention also discloses a method for removing groundwater carbon tetrachloride by using the system. The method comprises the following steps: enabling raw water to enter the aeration stripping pool from the upper part; adjusting the gas water ratio and aeration intensity; determining the aeration rate; stripping carbon tetrachloride; collecting the carbon tetrachloride for processing; enabling processed water to enter a clean water reservoir, disinfecting the water, and discharging the water. According to the invention, the carbon tetrachloride removal effect can be improved by 20%, the construction and operation cost is low, and the water quality meets the national standard.

Description

technical field [0001] The invention relates to a system and method for removing carbon tetrachloride pollutants in an underground water source water supply plant, in particular to an efficient, low-consumption, and by-product-free fixed-bed packing aeration blow-off carbon tetrachloride treatment in an underground water source water supply plant The method belongs to the technical field of water supply treatment. Background technique [0002] Groundwater accounts for 22.6% of the total fresh water resources in the world, and 1 / 4 of the world's people use groundwater as their drinking water source. There are 400 cities in my country exploiting groundwater, and the supply of groundwater has accounted for 20% of the total water supply in the country. Groundwater has become the main source of drinking water in the vast rural areas. [0003] The detection of groundwater organic pollution in 69 cities in 31 provinces of the country showed that among the organic pollutants, the c...

AI Technical Summary

Problems solved by technology

[0005] Considering the economic cost and water supply safety, the technical measures that water supply plants can adopt are activated carbon adsorption technology, biological pretreatment technology and aeration blow-off technology: 1) Activated carbon adsorption technology---activated carbon is a good water treatment agent, Activated carbon filters can be established in water plants to adsorb and remove carbon tetrachloride in water, but activated carbon adsorption is easily saturated and needs to be replaced regularly, resulting in high economic costs; 2) Biological pretreatment technology---biochemical treatment mainly uses the metabolism of microorganisms to degrade tetrachloride Carbon chloride, the biochemical reaction generally takes a long time, due to the lack of nutrients in the groundwater, the microorganisms cannot be fully nourished, cannot reproduce in large numbers, and cannot achieve a good removal effect; 3) Aeration and blow-off technology---Aeration The stripping method is a physical method, and an aeration stripping tank can be established in the water plant to use the difference between the actual concentration and the equilibrium concentration of dissolved compounds in the water to continuously diffuse the volatile components from the liquid phase to the gas phase to achieve the removal of volatility. purpose of organic matter

[0006] A comprehensive comparison shows that the aeration stripping technology has certain advantages over other treatment methods. It is mainly in the form of stripping towers, but there are problems of high construction costs, high operating costs, and secondary pollution. It is mainly used in the field of sewage treatment

Therefore, the existing aeration and stripping technology treatment methods and process parameters are not suitable for groundwater source water supply plants, and groundwater source water supply plants lack a simple and efficient carbon tetrachloride removal process

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