Biodegradation and kinetics of aerobic granules under high organic loading rates in sequencing batch reactor |
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Authors: | Yao Chen Wenju Jiang David Tee Liang Joo Hwa Tay |
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Institution: | (1) College of Architecture and Environment, Sichuan University, Chengdu, 610065, People’s Republic of China;(2) Institute of Environmental Science and Engineering, Nanyang Technological University, Singapore, 637723, Singapore |
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Abstract: | Biodegradation, kinetics, and microbial diversity of aerobic granules were investigated under a high range of organic loading
rate 6.0 to 12.0 kg chemical oxygen demand (COD) m−3 day−1 in a sequencing batch reactor. The selection and enriching of different bacterial species under different organic loading
rates had an important effect on the characteristics and performance of the mature aerobic granules and caused the difference
on granular biodegradation and kinetic behaviors. Good granular characteristics and performance were presented at steady state
under various organic loading rates. Larger and denser aerobic granules were developed and stabilized at relatively higher
organic loading rates with decreased bioactivity in terms of specific oxygen utilization rate and specific growth rate (μ
overall) or solid retention time. The decrease of bioactivity was helpful to maintain granule stability under high organic loading
rates and improve reactor operation. The corresponding biokinetic coefficients of endogenous decay rate (k
d), observed yield (Y
obs), and theoretical yield (Y) were measured and calculated in this study. As the increase of organic loading rate, a decreased net sludge production (Y
obs) is associated with an increased solid retention time, while k
d and Y changed insignificantly and can be regarded as constants under different organic loading rates. |
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Keywords: | Aerobic granule Sequencing batch reactor PCR-DGGE Biokinetics Specific oxygen utilization rate Solid retention time |
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