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论文类型： 期刊论文

发表时间： 2009-06-01

发表刊物： ENVIRONMENTAL ENGINEERING SCIENCE

收录刊物： SCIE、EI、Scopus

卷号： 26

期号： 6

页面范围： 1047-1053

ISSN号： 1092-8758

关键字： denitrification; MBR; methanogenesis; nitrogen removal; recirculation ratio; UASB

摘要： Simultaneous methanogenesis and nitrogen removal using a combined system consisting of an up-flow anaerobic sludge blanket (UASB) and aerobic membrane bioreactor (MBR) was investigated for treating synthetic municipal wastewater. A more reliable effluent quality of above 98.0% total organic carbon (TOC) and 98.0% NH(4)(+)-N removal was achieved consistently throughout the experiments. Total nitrogen (TN) removal of up to 82.8% could also be achieved when the recycling ratio was increased from 0 to 800%. Analysis of the biogas composition showed that the degradation of NO(X)(-)-N through denitrification did not have any obvious effect on the total methane production up to a recycling ratio of 400%. A higher recycling ratio of 800% resulted in an increase of CO(2) and a decrease of CH(4), due to more sludge being washed out from the UASB into the MBR and recycled back into the UASB, which resulted in a higher dissolved oxygen (DO) concentration in the UASB. Hence, an optimal recycling ratio of 400% was suggested to achieve higher carbon and nitrogen removal efficiencies with over 56.3% methane in the biogas using the new combined system.