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With the rapid development of the social economy, the demand for water resources is becoming stronger. However, the current situation facing our country is rich: the total water resources, less per capita water resources, water pollution is serious. Due to the lack of clean water, sewage resources is attracting attention as a new water resource. Very complex due to the quality of raw water, the conventional wastewater water treatment technology can not better meet reuse requirements. Advanced Oxidation technology as a new wastewater treatment technology, becoming one of the hot spots of the wastewater treatment technology; Biological Aerated Filter (BAF), but also because of the efficiency of the biological role and process characteristics, water reuse technology received wide attention. Beijing area secondary effluent from a wastewater treatment plant biological test for raw water through small processing performance compared separate ozone and advanced oxidation (catalytic ozonation), The catalytic ozonation dissolved ozone concentration higher than ozone alone, and less volatile, conducive to the oxidative degradation of pollutants, UV 254 removal rate is higher than the removal rate of COD Mn . Consider economic factors, too much ozone dosage does not make sense in practical projects, mainly to see the smaller dosage (10mg / L) treatment efficiency, the catalytic ozonation not intended as much removal of organic matter but to improve water quality , to change of organics institutions and characteristics, to help strengthen biological treatment for the next segment. Evaluated in a pilot air BAF, then BAF after pure oxygen BAF well as coagulation and sedimentation process as the main three to BAF. Separate biological aerated filter pollutants removal less effective, less shock load capability, can not reach back to the water requirements. Pure oxygen Biological Aerated Filter dissolved oxygen content, is conducive to the growth of microorganisms, due to the low organic matter content of the raw water, high ammonia content, carbon column dominant strain nitrobacteria in, high efficiency of ammonia treatment; oxygen can not change the water structure of organic matter, organic compound removal is not a big COD Mn removal with air aeration close. BAF process followed by coagulation and sedimentation, coagulation and sedimentation of organic matter removal, but due to the higher levels of algae in the water, the turbidity is not easy settlement, after Shen higher effluent turbidity is not conducive to the BAF and sand The operation of the filter, the removal of ammonia nitrogen has not been strengthened. Above three processes of water molecular weight distribution of no significant impact, not essentially change the quality of raw water, the treatment effect by the impact load, subject to certain limitations in the practical application of engineering. Advanced oxidation (catalytic ozonation) together with the BAF, give full play to their respective strengths to achieve a complementary role. Followed by advanced oxidation the BAF process of pollution indicators are very good removal efficiency, advanced oxidation stage of organic matter (such as chroma of COD Mn UV 254 and other indicators ) have a better processing capacity, the use of strong oxidation of the organic matter oxidative decomposition radicals; Advanced oxidation reaction can produce more
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