用于地下回灌的城市污水臭氧处理

为回用城市污水 ,以缓解我国水资源日益短缺的紧张局面 ,研究了臭氧对典型城市二级生化出水 (北京高碑店污水处理厂 )中有机物的去除效果。对以 AOX表征的有机物 ,臭氧与之的直接反应和间接反应的去除率存在限值 ,直接反应的最大去除率可达 2 4% ,间接反应的最大去除率可达 3 8%。间接反应中 ,NO-2 、细菌、苯系物优先与臭氧反应 ,AOX、DOC反应慢 ,臭氧去除 AOX是氧化卤素原子的脱卤作用。二级生化出水经臭氧处理后 ,还可以有效去除细菌 ,并破坏大分子及苯环 ,从而提高了水的可生化降解性。臭氧消耗量为 2 4mg/ L 时 ,再经土壤含水层处理 ,出水 DOC值可达地下水水源标准

Ozone treatment of municipal wastewater for groundwater recharge

Municipal wastewater must be reused to solve the water shortage problem in China. This paper analyzes ozone treatment of typical secondary effluent from a sewage treatment plant (Gaobeidian Sewage Treatment Plant). The maximum removal efficiency for organic pollutants characterized by AOX in direct reactions could reach 24%, and that in indirect reactions could reach 38%. In indirect reaction, NO - 2, bacteria and organic compounds containing benzene first react with ozone while organic pollutants characterized by AOX and DOC react more slowly with free radicals. The AOX are removed by the haloid atoms in organic halogens which are replaced by oxygen atoms. Ozone treatment can sterilize the effluent, break down the organic compounds with large molecular weight and those containing benzene. The ozone treated effluent then becomes more amenable to biological degradation. After the water is treated with ozone at a rate of 24 mg/L, and soil aquifer treatment (SAT), the DOC level can reach the groundwater resources standard.