Biodegradation and kinetics of aerobic granules under high organic loading rates in sequencing batch reactor

被引:0
作者
Yao Chen
Wenju Jiang
David Tee Liang
Joo Hwa Tay
机构
[1] Sichuan University,College of Architecture and Environment
[2] Nanyang Technological University,Institute of Environmental Science and Engineering
来源
Applied Microbiology and Biotechnology | 2008年 / 79卷
关键词
Aerobic granule; Sequencing batch reactor; PCR-DGGE; Biokinetics; Specific oxygen utilization rate; Solid retention time;
D O I
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中图分类号
学科分类号
摘要
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 (μoverall) 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 (kd), observed yield (Yobs), and theoretical yield (Y) were measured and calculated in this study. As the increase of organic loading rate, a decreased net sludge production (Yobs) is associated with an increased solid retention time, while kd and Y changed insignificantly and can be regarded as constants under different organic loading rates.
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页码:301 / 308
页数:7
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