Three-stage restoration method and three-stage restoration device of organic-chlorohydrocarbon-polluted underground water

A remediation method and technology for groundwater, applied in the treatment of polluted groundwater/leachate, multi-stage treatment of water/sewage, water pollutants, etc., can solve the problems of increasing the difficulty and cost of groundwater remediation, and achieve simple structure and economical treatment. Cost, convenient operation effect

Active Publication Date: 2014-11-19
JIANGSU SUNTIME ENVIRONMENTAL REMEDIATION
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Problems solved by technology

After the formation of DNAPL, it is slowly released into the groundwater, especially in the case

Method used

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  • Three-stage restoration method and three-stage restoration device of organic-chlorohydrocarbon-polluted underground water
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  • Three-stage restoration method and three-stage restoration device of organic-chlorohydrocarbon-polluted underground water

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[0042] Specific example: Groundwater contaminated by chlorinated hydrocarbons (including: 2.98mg / L of trichloroethylene, 260mg / L of tetrachloroethylene, 49.1mg / L of 1,2-dichloroethane) is pumped Into the hot stripping aeration oxidation tower 4, at the same time, hot air of 35℃~50℃, 250~300mmAq is introduced into the aeration oxidation section for intermittent aeration, and oxidant is introduced into the intermittently for oxidation reaction, every 30 minutes of aeration, Infuse the oxidant for 10 minutes, the oxidant is Fenton's reagent, and the gas-water ratio is controlled to 10. After the system is stable, check the effluent water of the thermal stripping aeration oxidation tower 4: the concentration of trichloroethylene is about 0.057mg / L, tetrachloroethylene The concentration is 0.41mg / L, the concentration of 1,2-dichloroethane is 0.023mg / L, and the overall removal effect is more than 99%. It can be seen that the process and equipment can achieve a good effect on the remed...

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Abstract

The invention relates to the field of government of organically polluted underground water and especially relates to a three-stage restoration method and a three-stage restoration device of organic-chlorohydrocarbon-polluted underground water. The method particularly includes following steps: 1) feeding hot air from the bottom of a thermally air-stripping aerating oxidization column, wherein the hot air contacts with polluted underground water in a thermally air-stripping section; 2) carrying out a batch-type aeration operation to the underground water in an aerating oxidization section; 3) feeding the underground water to an ordered mesopore liquid-phase adsorption column and carrying out a deep adsorption process, and if the underground water is qualified, pumping the underground water to a recharge well to enable the underground water to be recharged to an underground water layer, if the underground water is not qualified, feeding the underground water back to the thermally air-stripping aerating oxidization column for reprocessing. Compared with the prior art, the invention is advantaged in that the method and the device are energy-saving and environmental-protective, are free of secondary pollution, have a total removal effect being more than 99%, can achieve continuous underground water restoration, can greatly increase a treatment efficiency of the organically polluted underground water and can save a treatment cost.

Description

Technical field [0001] The invention relates to the field of organic polluted groundwater treatment, in particular to a three-level repair method and device for groundwater polluted by organic chlorinated hydrocarbons. Background technique [0002] In recent years, with the development of industrialization and urbanization in China, a large amount of "three wastes" are discharged into the environment every year, which not only causes serious pollution to the soil, but also the direct discharge of wastewater and the infiltration of waste residues through surface water into the ground, causing groundwater. Pollution. According to statistics, 90% of groundwater in my country has been polluted to varying degrees. Especially in northern cities, groundwater is the main source of urban water supply. Groundwater pollution has aggravated the shortage of water resources, posing a serious threat to people's safe water supply, and posing a huge potential harm to the ecological environment. ...

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Application Information

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IPC IPC(8): C02F9/04C02F1/20C02F1/72C02F1/78C02F101/36C02F103/06
CPCY02W10/37
Inventor 钟晓梅唐晓声姚凯李海建
Owner JIANGSU SUNTIME ENVIRONMENTAL REMEDIATION
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