Microbiological aspects of a bioreactor with submerged membranes for aerobic treatment of municipal wastewater

Witzig, Robert; Manz, Werner; Rosenberger, S.; Krüger, Urse Scheel; Kraume, Matthias; Szewzyk, Ulrich

doi:10.1016/s0043-1354(01)00221-4

Cited by 127 publications

(63 citation statements)

References 19 publications

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“…not available a Recirculation between the membrane and biological tanks abundance than the Alphaproteobacteria (Table 4). Overall, the general community characteristics in the studied plants were similar to previously reported studies on MBRs, with Betaproteobacteria as the most abundant group (Luxmy et al 2000;Witzig et al 2002;Sofia et al 2004), followed by Gammaproteobacteria (Sofia et al 2004). Archaea were detected in all of the MBRs except in MBRs 5 and 7, but in low abundance.…”

Section: General Microbial Characterizationsupporting

confidence: 86%

“…The high NH 4 -N consumption observed in this plant may have been partially consumed for the growth of heterotrophic biomass (MBR 5 had the highest biomass concentration). Additionally, unidentified AOBs and AOAs that are not covered by the employed FISH probes could be present in this MBR, as has been previously suggested in literature (Witzig et al 2002;Chen and LaPara 2008). Comparing the P removal performance achieved in each plant (Table 2), MBRs 1 to 5 achieved low P effluent concentrations with a high total level of P removal, particularly in MBRs 4 and 5, which were designed for EBPR.…”

Section: Discussionsupporting

confidence: 60%

“…Low or non-detection of AOB fluorescence signal was previously reported for MBR biomass (Luxmy et al 2000;Witzig et al 2002;Pala et al 2008). AOBs were present in the form of small coccobacilli and always grouped in small-sized clusters, although in MBR 3 it was also possible to observe some big AOB cocci dispersed in the flocs.…”

Section: General Microbial Characterizationmentioning

confidence: 69%

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Microbial population analysis of nutrient removal-related organisms in membrane bioreactors

Silva

Carvalho

Oehmen

et al. 2011

Appl Microbiol Biotechnol

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Membrane bioreactors (MBR) are an important and increasingly implemented wastewater treatment technology, which are operated at low food to microorganism ratios (F/M) and retain slow-growing organisms. Enhanced biological phosphorus removal (EBPR)-related organisms grow slower than ordinary heterotrophs, but have never been studied in detail in MBRs. This study presents a comprehensive analysis of the microorganisms involved in EBPR in pilot-and full-scale MBRs, using fluorescence in situ hybridization (FISH), as well as an overall assessment of other relevant microbial groups. The results showed that polyphosphate accumulating organisms (PAOs) were present at similar levels in all studied MBRs (10%±6%), even those without a defined anaerobic zone. Glycogen accumulating organisms were also detected, although rarely. The FISH results correlated well with the observed P removal performance of each plant. The results from this study suggest that a defined anaerobic zone is not necessarily required for putative PAO growth in MBRs, since polyphosphate storage may provide a selective advantage in fulfilling cell maintenance requirements in substrate-limited conditions (low F/M).

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Section: General Microbial Characterizationsupporting

confidence: 86%

Section: Discussionsupporting

confidence: 60%

Section: General Microbial Characterizationmentioning

confidence: 69%

See 1 more Smart Citation

Microbial population analysis of nutrient removal-related organisms in membrane bioreactors

Silva

Carvalho

Oehmen

et al. 2011

Appl Microbiol Biotechnol

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“…The dissolved oxygen concentration was recorded as a function of time. According to the method described earlier (Witzig et al, 2002), the membrane oxygen electrode was inserted in a flask, sealed with a rubber stopper to prevent oxygen loss. The sludge was mixed with a magnetic stirrer.…”

Section: Experimental System and Operational Conditionsmentioning

confidence: 99%

“…The 16S rRNA-targeted oligonucleotide probes used in this study was EUB338 which could quantify members of the domain bacteria with a sufficiently high rRNA content. Usually, cells with low rRNA contents were often associated with dormant, starved or very slowly growing states with a low metabolic activity (Witzig et al, 2002). Only the EUB probe-positive cells were considered as active .…”

Section: Experimental System and Operational Conditionsmentioning

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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Membrane Bioreactors for Wastewater Treatment

Cornel

Krause²

2008

Advanced Membrane Technology and Applications

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Microbiological aspects of a bioreactor with submerged membranes for aerobic treatment of municipal wastewater

Cited by 127 publications

References 19 publications

Microbial population analysis of nutrient removal-related organisms in membrane bioreactors

Microbial population analysis of nutrient removal-related organisms in membrane bioreactors

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

Membrane Bioreactors for Wastewater Treatment

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