点击次数：

论文类型： 期刊论文

发表时间： 2013-10-01

发表刊物： CHEMICAL ENGINEERING JOURNAL

收录刊物： SCIE、EI、Scopus

卷号： 232

页面范围： 65-73

ISSN号： 1385-8947

关键字： Anaerobic; Den-anammox; Nitrogen removal approaches; Low C/N municipal sewage

摘要： In this study, an integrated anaerobic hydrolysis (A)/nitrification (O)/denitrification-anammox (den-anammox) (A) fixed-bed baffled bioreactor was constructed to treat low C/N (COD/NH4-N) municipal sewage. With the influent COD/NH4-N of 1.38-5.01, the average TN and COD removal percentages of bioreactor arrived to 89.9% and 91.5% under the room temperature (25 degrees C). By the innovative design (partial nitrification, den-anammox technology and no sludge returning), the A/O/A bioreactor can theoretically save at least 54.2% of energy consumption (calculated by aeration quantity) compared with traditional nitrification-denitrification process. Under the COD/NO3-N of 0.94-1.69, the collaborative denitrification of denitrifying bacteria and anammox bacteria was successfully achieved in the Den-Anammox Pool (DAP) of bioreactor. The maximum NH4-N and TN removal percentages of DAP arrived to 97.6% and 93.8%, respectively. The nitrogen removal contribution of den-anammox process was above 70% by mass-balance theory. DGGE (denaturing gradient gel electrophoresis) and gene sequencing results showed that the microbial community was diverse and the dominant bacteria of DAP changed from single anammox bacterium group into one group containing anammox bacterium and denitrifying bacterium by 175-day domestication. According to FISH (fluorescence in situ hybridization) results, the percentage of anammox bacterium declined from 89% to 58% in DAP. (C) 2013 Elsevier B.V. All rights reserved.