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

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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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Correspondence to Joo Hwa Tay.

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Chen, Y., Jiang, W., Liang, D.T. et al. Biodegradation and kinetics of aerobic granules under high organic loading rates in sequencing batch reactor. Appl Microbiol Biotechnol 79, 301–308 (2008). https://doi.org/10.1007/s00253-008-1421-6

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Keywords

  • Aerobic granule
  • Sequencing batch reactor
  • PCR-DGGE
  • Biokinetics
  • Specific oxygen utilization rate
  • Solid retention time