Mechanistic study of on-site sludge reduction in a baffled bioreactor consisting of three series of alternating aerobic and anaerobic compartments

Feng, Qing; Yu, Anfeng; Chu, Libing; Chen, Hongzhang; Xing, Xin‐Hui

doi:10.1016/j.bej.2012.05.006

Cited by 25 publications

(7 citation statements)

References 29 publications

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“…The evolution of microbial species to slow growers with low sludge yield under anaerobic conditions was proved by pyrosequencing (Zhou et al, 2015). Among slow-growing bacteria, enrichment of fermenters was observed in plants equipped with aerobiceanaerobic zones, with ability to degrade flocs and accelerate sludge decay (Goel and Noguera, 2006;Quan et al, 2012;Li et al, 2014).…”

Section: Bacterial Cells Do Not Decrease Under Anaerobic Conditionsmentioning

confidence: 99%

“…Some hypotheses have been proposed in the literature to explain the possible mechanisms of sludge reduction, such as uncoupling metabolism (Chudoba et al, 1992b;Troiani et al, 2011) or cell lysiscryptic growth (Wei et al, 2003;Quan et al, 2012), but these processes have not been fully demonstrated to date. In the study of An and Chen (2008) sludge decay in the anaerobic reactor was indicated as the main mechanism of the OSA system.…”

mentioning

confidence: 98%

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Concerning the role of cell lysis-cryptic growth in anaerobic side-stream reactors: The single-cell analysis of viable, dead and lysed bacteria

et al. 2015

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Section: Bacterial Cells Do Not Decrease Under Anaerobic Conditionsmentioning

confidence: 99%

mentioning

confidence: 98%

Concerning the role of cell lysis-cryptic growth in anaerobic side-stream reactors: The single-cell analysis of viable, dead and lysed bacteria

et al. 2015

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“…This is evident in intermittently aerated reactors (Foladori et al, 2010) and nitrogen removal systems (Mahmood and Elliott, 2006). Sludge minimisation has been accomplished in CAS by deliberately placing alternating aerobic and anaerobic compartments, as in the case of the "repeated coupling of aerobic and anaerobic CAS" achieving a 64% less sludge production than a strictly aerobic CAS (Quan et al, 2012). Therefore, it can be surmised that alternating redox conditions are a key component in sludge minimisation.…”

Section: Sludge Minimisation By Alternating Aerobic/anaerobic/anoxic mentioning

confidence: 99%

“…Sludge cycling is clearly a major aspect of sludge reduction in OSA.OSA is not completely devoid of any substrate. This is because cell lysis releases biodegradable low molecular weight compounds that could be utilized by certain bacteria for propagation -a process called cryptic growth(Quan et al, 2012;Wei et al, 2003).…”

mentioning

confidence: 99%

Sludge cycling between aerobic, anoxic and anaerobic regimes to reduce sludge production during wastewater treatment: Performance, mechanisms, and implications

Semblante

Hai

Ngo

et al. 2014

Bioresource Technology

149

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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.

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“…In this condition, the energy generated from the oxidation of organic substrate is partially used for anabolism. Thus, when maintaining the microorganism under the energetic state of uncoupling metabolism, a decrease in the microbial synthesis is induced (Quan et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Reduction of Biological Sludge Production Applying an Alternating Oxic/anoxic Process in Water Line

Eusebi

Panigutti²,

Battistoni³

2016

Water Environment Research

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Alternating oxic/anoxic process, applied for the main objective of the improvement of nitrogen performances, was studied in terms of secondary effect of biomass reduction. The process was carried out in one real water resource recovery facility and the data were compared with the previous conventional period when a conventional process was adopted. The main mechanism of the process for the sludge minimization is recognized in the metabolic uncoupling. In fact, an increase of the specific oxygen uptake rate in the biological reactor was recorded stimulated by the change of the oxidation reduction potential environment. Moreover, the heterotrophic growth yield was measured equal to 0.385 kgVSS/kgCOD. The global percentage of reduction was tested with the mass balance of solids. The process is able to decrease the observed sludge yield up to 20%. The specific energy consumption was evaluated.

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Mechanistic study of on-site sludge reduction in a baffled bioreactor consisting of three series of alternating aerobic and anaerobic compartments

Cited by 25 publications

References 29 publications

Concerning the role of cell lysis-cryptic growth in anaerobic side-stream reactors: The single-cell analysis of viable, dead and lysed bacteria

Concerning the role of cell lysis-cryptic growth in anaerobic side-stream reactors: The single-cell analysis of viable, dead and lysed bacteria

Sludge cycling between aerobic, anoxic and anaerobic regimes to reduce sludge production during wastewater treatment: Performance, mechanisms, and implications

Reduction of Biological Sludge Production Applying an Alternating Oxic/anoxic Process in Water Line

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