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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Effects of carbon-nitrogen ratio on nitrogen removal in a sequencing batch reactor enhanced with low-intensity ultrasound.
Bioresource Technology 2013 November
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 56.1mg 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.
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