Application of MBR for hospital wastewater treatment in China |
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Authors: | Qiaoling Liu Yufen Zhou Xiang Zheng |
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Affiliation: | a School of Environment and Natural Resources, Remin University of China, Beijing100872, China b College of Environmental Science and Engineering, Peking University, Beijing, 100871, China c Department of Agricultural, Food and Nutritional Science University of Alberta, Edmonton, AB, Canada T6G 2P5 |
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Abstract: | In China, the number of hospitals has increased to 19,712 in 2008, with the production of hospital wastewater reaching 1.29 × 106 m3/d. Membrane bioreactor (MBR) technology presents a more efficient system at removing pathological microorganism compared with existing wastewater treatment systems. In the past 8 yr, over 50 MBR plants have been successfully built for hospital wastewater treatments, with the capacity ranging from 20 to 2000 m3/d. MBR can effectively save disinfectant consumption (chlorine addition can decrease to 1.0 mg/L), shorten the reaction time (approximately 1.5 min, 2.5-5% of conventional wastewater treatment process), and attain a good effect of inactivation of microorganism. Higher disinfection efficacy is achieved in MBR effluents at lower dose of disinfectant with less disinfection by-products (DBPs). Moreover, when capacity of MBR plants increases from 20 to 1000 m3/d, their operating cost decreases sharply. |
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Keywords: | Hospital wastewater Membrane bioreactor (MBR) Disinfection By-products (DBPs) |
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