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论文类型：期刊论文

发表时间：2013-11-01

发表刊物：BIORESOURCE TECHNOLOGY

收录刊物：SCIE、EI、PubMed、Scopus

卷号：148

页面范围：128-134

ISSN号：0960-8524

关键字：C/N ratio; Nitrogen removal; Low-intensity ultrasound; SBR; DGGE

摘要：A sequencing batch reactor (SBR) enhanced with low-intensity ultrasound was designed to study the removal of nitrogen under different carbon-nitrogen (C/N) ratios. The results showed that the removal efficiencies of CODCr and nitrogen were inversely proportional to C/N ratios. The CODCr of the effluent in the control reactor (CR) and the low-intensity ultrasound-enhanced reactor (UER) were lower than 40 mg L-1. With a decrease in C/N ratio, the NH4+-N removal load of the CR showed little change, while the NH4+-N removal load of UER increased from 21.2 to 56.1 mg NH4+-N/g mixed liquid suspended solids per day. To further understand effects of low-intensity ultrasound, the denaturing gel gradient electrophoresis (DGGE) analysis showed that the similar coefficients of the community structures in the UER and CR were 86%, 52% and 29% when the C/N ratios were 15:1, 10:1, 5:1, respectively. (C) 2013 Elsevier Ltd. All rights reserved.