Journal
BIORESOURCE TECHNOLOGY
Volume 155, Issue -, Pages 395-409Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.01.029
Keywords
Sludge minimisation; Oxic-settling-anaerobic; Bacterial predation; Endogenous decay; Metabolic uncoupling
Funding
- University of Wollongong
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Alternate cycling of sludge in aerobic, anoxic, and anaerobic regimes is a promising strategy that can reduce the sludge yield of conventional activated sludge (CAS) by up to 50% with potentially lower capital and operating cost than physical- and/or chemical-based sludge minimisation techniques. The mechanisms responsible for reducing sludge yield include alterations to cellular metabolism and feeding behaviour (metabolic uncoupling, feasting/fasting, and endogenous decay), biological floc destruction, and predation on bacteria by higher organisms. Though discrepancies across various studies are recognisable, it is apparent that sludge retention time, oxygen-reduction potential of the anaerobic tank, temperature, sludge return ratio and loading mode are relevant to sludge minimisation by sludge cycling approaches. The impact of sludge minimisation on CAS operation (e.g., organics and nutrient removal efficiency and sludge settleability) is highlighted, and key areas requiring further research are also identified. (C) 2014 Elsevier Ltd. All rights reserved.
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