Influence of sludge retention time on membrane fouling and bioactivities in membrane bioreactor system

Han, Seung-Soo; Bae, Tae‐Hyun; Jang, Gyung-Gug; Tak, Tae‐Moon

doi:10.1016/j.procbio.2004.09.017

Cited by 183 publications

(66 citation statements)

References 15 publications

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“…Han et al 32 attributed this decrease to the specific biological activity at prolonged SRT by the accumulation of inert biomass due to endogenous respiration.…”

Section: Formation and Characteristics Of The Aerobic Granular Biomassmentioning

confidence: 99%

Effect of coagulant‐flocculant reagents on aerobic granular biomass

Río¹,

Morales²,

Figueroa³

et al. 2012

J of Chemical Tech & Biotech

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“…Han et al 32 attributed this decrease to the specific biological activity at prolonged SRT by the accumulation of inert biomass due to endogenous respiration.…”

Section: Formation and Characteristics Of The Aerobic Granular Biomassmentioning

confidence: 99%

Effect of coagulant‐flocculant reagents on aerobic granular biomass

Río¹,

Morales²,

Figueroa³

et al. 2012

J of Chemical Tech & Biotech

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“…In fact, many MBR researchers have operated their systems with longer SRT, since a higher biomass concentration, which was derived from longer SRT, gave rise to a higher treatment efficiency. Nevertheless, at long SRT the accumulation of dead or inactive microorganisms occurs in the MBR, and thus affects the sludge activity (Huang et al, 2001;Han et al, 2005). Attention has been given to the relationship between SRT and extracellular polymeric substances (EPS) formation in recent studies (Cho et al, 2005;Masse et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Several studies stated that long SRT would increase the membrane fouling rate. Han et al (2005), running the bioreactors at SRTs of 50, 70 and 100 d, clearly showed that at prolonged SRT membranes were fouled more severely and it was difficult to control membrane fouling with air scour. Lee et al (2003) also observed that the overall fouling resistance increased in the MBRs as SRT prolonged.…”

Section: Introductionmentioning

confidence: 99%

Effect of sludge retention time on sludge characteristics and membrane fouling of membrane bioreactor

Ouyang¹,

Liu²

2009

Journal of Environmental Sciences

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Three identical membrane bioreactors (MBRs) were operated over 2 years at different sludge retention time (SRT) of 10 d, 40 d and no sludge withdrawal (NS), to elucidate and quantify the effect of SRT on the sludge characteristics and membrane fouling. The hydraulic retention times of these MBRs were controlled at 12 h. With increasing SRT, the sludge concentrations in the MBRs increased, whereas the ratio of volatile suspended solid to the total solid decreased, and the size of sludge granule diminished in the meantime. A higher sludge concentration at long SRT could maintain a better organic removal efficiency, and a longer SRT was propitious to the growth of nitrifiers. The performance of these MBRs for the removal of COD and NH 4 + -N did not change much with different SRTs. However, the bioactivity decreased as SRT increase. The measurement of specific oxygen uptake rates (SOUR) and fluorescence in situ hybridization (FISH) with rRNA-targeted oligonucleotide probes testified that SOUR and the proportion of the bacteria-specific probe EUB338 in all DAPI-stainable bacteria decreased with increasing SRT. The concentrations of total organic carbon, protein, polysaccharides and soluble extracellular polymeric substance (EPS) in the mixed liquor supernatant also decreased with increasing SRT. The membrane fouling rate was higher at shorter SRT, and the highest fouling rate appeared at a SRT of 10 d. Both the sludge cake layer and gel layer had contribution to the fouling resistance, but the relative contribution of the gel layer decreased as SRT increase.

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“…One of its counter measures is to provide sufficient time for methanogenesis step by prolonged sludge retention times (SRTs). But, prolonged SRT of AnMBR results in a decrease of methanogenesis activity due to sludge aging (Han et al 2005;Ho and Sung 2010). Methanogenesis activity of AnMBR was also inhibited by high shear condition in tubular membrane modules (Padmasiri et al 2007).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Multiple effects of trace elements on methanogenesis in a two-phase anaerobic membrane bioreactor treating starch wastewater

Wang

et al. 2016

Appl Microbiol Biotechnol

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For enhancing anaerobic membrane bioreactor (AnMBR) treating food processing wastewater due to speedlimited methanogenesis step, multiple effects of trace element (TE) supplementation on methanogenesis of a two-phase AnMBR were firstly investigated in batch tests. TE supplementation included individual element, combination and recovery of Fe, Ni, Co, Cu and Zn supplementation. Multiple effects of TE supplementation were highest stimulated by 22.4 ± 5.6 % (TE313) for chemical oxygen demand (COD) removal, 43.1 ± 12.5 % (TE303) for specific methanogenic activity (SMA) and 13.9 ± 3.7 % (TE405) for biomass growth, respectively, although only 7.5 ± 0.6 % (TE106) for methane production. Dosage of TEs played a critical role in methane production, COD removal and biomass growth of the AnMBR's methanogenesis. Low dosages of TE supplementation improved the COD removal and slightly stimulated the COD bioconverting to methane and biomass, but their specific methanation activities were inhibited in the initial rapid methanogenesis stage. Several methanation functional species were increased in abundance like Methanosarcina and Methanoculleus.

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Influence of sludge retention time on membrane fouling and bioactivities in membrane bioreactor system

Cited by 183 publications

References 15 publications

Effect of coagulant‐flocculant reagents on aerobic granular biomass

Effect of coagulant‐flocculant reagents on aerobic granular biomass

Effect of sludge retention time on sludge characteristics and membrane fouling of membrane bioreactor

Multiple effects of trace elements on methanogenesis in a two-phase anaerobic membrane bioreactor treating starch wastewater

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