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Minimization of Excess Activated Sludge in Nonwoven Fabric Filter Bioreactor  

Jung, Kyoung-Eun (School of Environmental & Civil Engineering, Inha University)
Bae, Min-Su (School of Environmental & Civil Engineering, Inha University)
Cho, Yun-Kyung (Department of Civil and Environmental Engineering, University of Wisconsin-Madison)
Cho, Kwang-Myeung (School of Environmental & Civil Engineering, Inha University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.1, 2006 , pp. 88-96 More about this Journal
Abstract
Among the various methods for minimization of waste activated sludge, maintaining a low F/M ratio in the bioreactor is known to be the most effective reliable one. In this research, various experiments were performed to check the capability of the nonwoven fabric filter bioreactor, which has been proved able to maintain a low F/M ratio by maintaining a high MLSS concentration, for excess sludge minimization. The reactor was intermittently fed with a synthetic wastewater having a COD concentration of approximately 300 mg/L and no SS. Results of the experiments showed that the F/M ratio in the reactor decreased to a minimum value of 0.02 g COD/g MLSS-day as the MLSS concentration increased to a maximum value of 31,010 mg/L. However, the measured endogenous decay coefficients and oxygen uptake rates of the MLSS confirmed that the activity of the MLSS decreased as the MLSS concentration increased. Based on the increase of MLSS in the reactor and the mass balance during the whole experimental period, the average microorganism yield coefficients were computed to be low values of 0.148 and 0.139 g MLSS/g COD, respectively. These results indicate that the nonwoven fabric filter bioreactor employed in this research is effective for minimization of excess sludge production.
Keywords
Sludge Minimization; Waste Activated Sludge; Nonwoven Fabric Filter; Biological Treatment; Endogenous Decay;
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Times Cited By KSCI : 1  (Citation Analysis)
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