Recovery of a hybrid and conventional membrane bioreactor following long-term starvation

Palmarin, Matthew J.; Young, Stephanie; Chan, Jonathan

doi:10.1016/j.jwpe.2019.101027

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…The effect was reflected in the higher TMP build-up rate in the initial week of operation at each HRT after the shutdown period. Palmarin et al (2020) investigated fouling propensity of microbial byproducts after starvation and reported rapid fouling rate for the initial 4 days after reactivation. For longer starvation periods, beyond a stage, biomass lysis can occur (as indicated by MLVSS content loss during each starvation period), producing high molecular weight EPS possessing high fouling potential (Wu and Lee, 2011).…”

Section: Eps and Membrane Foulingmentioning

confidence: 99%

“…Decentralized AnMBRs are being investigated in developing countries for cost-effective treatment and possible on-site reuse of the treated wastewater (Bair, 2016). However, decentralized treatment systems can experience long starvation during holiday seasons and short periods of starvation during maintenance closure (Palmarin et al, 2020). The consequent famine conditions lead to increased production of biomass-associated products through endogenous respiration and cell debris accumulation that enhances membrane fouling as experienced in aerobic MBRs (Palmarin et al, 2020;Wu and Lee, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Performance of Anaerobic Membrane Bioreactor (AnMBR) with Sugarcane Bagasse Ash-based Ceramic Membrane treating Simulated Low-strength Municipal Wastewater: Effect of Operation Conditions

Dhiman¹,

Balakrishnan

Naddeo

et al. 2023

Water Air Soil Pollut

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This study assesses the performance of waste sugarcane bagasse ash (SBA)-based ceramic membrane in anaerobic membrane bioreactor (AnMBR) treating low-strength wastewater. The AnMBR was operated in sequential batch reactor (SBR) mode at hydraulic retention time (HRT) of 24 h, 18 h, and 10 h to understand the effect on organics removal and membrane performance. Feast-famine conditions were also examined to evaluate system performance under variable influent loadings. An average removal of >90% chemical oxygen demand (COD) was obtained at each HRT and starvation periods up to 96 days did not significantly affect removal efficiency. However, feast-famine conditions affected extracellular polymeric substances (EPS) production and consequently the membrane fouling. EPS production was high (135 mg/g MLVSS) when the system was restarted at 18 h HRT after shutdown (96 days) with corresponding high transmembrane pressure (TMP) build-up; however, the EPS content stabilized at ~60-80 mg/g MLVSS after a week of operation. Similar phenomenon of high EPS and high TMP was experienced after other shutdowns (94 and 48 days) as well. Permeate flux was 8.8±0.3, 11.2±0.1 and 18.4±3.4 L/m 2 h at 24 h, 18 h and 10 h HRT, respectively. Filtration-relaxation (4 min -1 min) and backflush (up to 4 times operating flux) helped control fouling rate. Surface deposits (that significantly attributed to fouling) could be effectively removed by physical cleaning, resulting in nearly complete flux recovery. Overall, SBR-AnMBR system equipped with waste-based ceramic membrane appears promising for treatment of low-strength wastewater with disruptions in feeding.

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Section: Eps and Membrane Foulingmentioning

confidence: 99%