Impact of starvation conditions on the nitrifying performance and sludge properties in SBR system with a limited filamentous bulking state

Liu, Wenlong; Li, Jun; Peng, Yongzhen

doi:10.1016/j.scitotenv.2021.148997

Cited by 13 publications

(1 citation statement)

References 30 publications

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“…The activated sludge process is well-adapted for domestic and industrial wastewater treatment [ 1 , 2 , 3 ]. The extensive biomass generation in such retention systems also remains a tricky problem from a socio-economic and sustainable environment perspective since the excess sludge contains various hazardous substances and the management cost is considerably high [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

In-Situ Sludge Reduction in Membrane-Controlled Anoxic-Oxic-Anoxic Bioreactor: Performance and Mechanism

Maqbool

Kang

et al. 2022

Membranes

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Conventional and advanced biological wastewater treatment systems generate excess sludge, which causes socio-economic and environmental issues. This study investigated the performance of membrane-controlled anoxic-oxic-anoxic (AOA) bioreactors for in-situ sludge reduction compared to the conventional anoxic-oxic-oxic membrane bioreactor (MBRcontrol). The membrane units in the AOA bioreactors were operated as anoxic reactors at lower sludge recirculation rates to achieve hydrolysis of extracellular polymeric substances (EPS) and extensive endogenous respiration. Compared to MBRcontrol, the AOA bioreactors operated with 90%, and 80% recirculation rates reduced the sludge growth up to 19% and 30%, respectively. Protein-like components were enriched in AOA bioreactors while fulvic-like components were dominant in MBRcontrol. The growth of Dechloromonas and Zoogloea genra was promoted in AOA bioreactors and thus sludge reduction was facilitated. Metagenomics analysis uncovered that AOA bioreactors exhibited higher proportions of key genes encoding enzymes involved in the glycolysis and denitrification processes, which contributed to the utilization of carbon sources and nitrogen consumption and thus sludge reduction.

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