Clarifying the roles of kinetics and diffusion in activated sludge filamentous bulking

Biotechnology and Bioengineering
Inchio Lou, F L de los Reyes

Abstract

We hypothesized that the growth rates of filaments and floc formers in activated sludge are affected by the combination of kinetic selection (Lou and de los Reyes, Biotechnol Bioeng 92(6): 729-739, 2005b) and substrate diffusion limitation (Martins et al., Water Res 37:2555-2570, 2003). To clarify the influence of these factors in explaining filamentous bulking, a conceptual framework was developed in this study. The framework suggests the existence of three different regions corresponding to bulking, non-bulking, and intermediate regions, based on substrate concentration. In the bulking and non-bulking regions, kinetic growth differences control the competition process, and filaments or floc formers dominate, respectively. In the intermediate region, substrate diffusion limitation, determined by the floc size, plays the major role in causing bulking. To test this framework, sequencing batch reactors (SBRs) were operated with influent COD of 100, 300, 600, and 1,000 mg/L, and the sludge settleability was measured at various floc size distributions that were developed using different mixing strengths. The experimental data in the bulking and intermediate regions supported the proposed framework. A model integrating the two facto...Continue Reading

References

Nov 7, 2000·Biotechnology and Bioengineering·B W Brandt, S A Kooijman
May 20, 2003·Water Research·António M P MartinsMark C M van Loosdrecht
Feb 11, 2004·Water Research·António M P MartinsMark C M van Loosdrecht
Apr 7, 2004·Applied and Environmental Microbiology·Jiangying LiaoFrancis L de los Reyes
Dec 4, 2004·Environmental Science & Technology·António M P MartinsMark C M Van Loosdrecht
Jun 23, 2005·Water Environment Research : a Research Publication of the Water Environment Federation·In Chio Lou, Francis L de los Reyes
Sep 13, 2005·Biotechnology and Bioengineering·Inchio Lou, Francis L de Los Reyes
Dec 24, 2005·Biotechnology and Bioengineering·Ozlem KarahanMark C M van Loosdrecht

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Citations

Aug 11, 2010·Water Research·António M P MartinsMark C M van Loosdrecht
Aug 11, 2011·Bioengineered Bugs·Jeongdong ChoiRamesh Goel
Nov 12, 2014·Environmental Science. Processes & Impacts·Shengnan XuZhiqiang Hu
Dec 16, 2016·FEMS Microbiology Letters·Vivi L NguyenFrancis L de Los Reyes

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