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《Environmental Science & Technology》 2010-01
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Pilot Study on High Concentration Food Additives Wastewater

CHEN Zhi-wei,WANG Xiao-jun(School of Environmental Science and Engineering,South China University of Technology,Guangzhou 510006,China)  
According to characteristics of food additives wastewater with great variety of quality and complicated composition,the combined process of hydrolysis acidification-contacting oxidation-catalytic ozonization-biological aerated filter(BAF)was proposed.Results showed that the effluent COD can fall below 100mg/L from about 2,000~7,000mg/L of influent,with the minimum effluent COD as 33mg/L and quality of effluent satisfactory to integrated wastewater discharge standard.After the treatment of hydrolysis acidification system,COD of wastewater decreased from 5,290mg/L to 2,323mg/L,and the molecular structure of compounds which are nonbiodegradable was changed into smaller molecules,which can make the wastewater easier treated by contacting oxidation system.Average effluent COD of contacting oxidation system was 268mg/L.Catalytic ozonization preoxidation could improve the biodegradability of wastewater,whose BOD5/COD rate from 0.3 up to 0.44 when COD removed 45%.The pilot study showed that hydrolysis acidification system and system with catalytic ozonization using ceramsite enwrapped by MnO2 as catalyst-BAF process are the key elements of process for treating high concentration food additives wastewater which can stably satisfy the water quality of discharging limit.
【CateGory Index】: X703
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