Ahmed, Zubair Lim, Byung-Ran Cho, Jinwoo Song, Kyung-Guen Kim, Ki-Pal Ahn, Kyu-Hong 2024-01-21T00:02:32Z 2024-01-21T00:02:32Z 2021-09-02 2008-01 0043-1354 https://pubs.kist.re.kr/handle/201004/133860 Bacterial community structures in four sequencing anoxic/anaerobic-aerobic membrane bioreactors (SAMs) that were fed with synthetic medium composed of different organic compounds in substrate as carbon source; acetate-dominant (acetate/propionate = 4/1), propionate-dominant (acetate/propionate = 1/4), glucose-dominant (glucose/acetate = 4/1) and methanol-dominant (methanol/acetate/propionate = 6/3/1) were analyzed by respiratory quinone profile and fluorescent in situ hybridization (FISH) techniques. The SAMs were operated at controlled pH range 7-8.5 and at constant temperature 25 degrees C. Total nitrogen (TN), total phosphorus (TP) and COD removal performances were also evaluated and compared. In addition, trans-membrane pressure was monitored to observe the impact of substrate composition on membrane fouling. The dominance of the mole fraction of ubiquinone (UQ-8) in the SAMs indicated dominance of the beta-subclass of Proteobacteria; however, its population comparatively decreased when the substrate was glucose dominant or methanol dominant. A relatively higher and stable enhanced biological phosphorus removal performance was observed when methanol-dominant substrate was used concurrently with an increase in the gamma-subclass of Proteobacteria. The population of the x-subclass of Proteobacteria slightly increased along with a decrease in phosphate removal activity when the substrate was glucose-dominant. Results from FISH analysis also supported the findings of the quinone profile. The trans-membrane pressure variation in the SAMs indicated that fouling was relatively rapid when propionate-dominant or methanol-dominant substrate was used and most stable when glucose-dominant substrate was used. A combination of methanol and acetate would be a better choice as an external carbon source when nutrients removals, as well as fouling, are considered in the membrane bioreactor- (MBR-) coupled biological nutrients removing (BNR) process. (c) 2007 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD GLYCOGEN-ACCUMULATING ORGANISMS TARGETED OLIGONUCLEOTIDE PROBES WASTE-WATER ACTIVATED-SLUDGE ISOPRENOID QUINONE DIFFERENT RATIOS GEN. NOV. IDENTIFICATION POLYPHOSPHATE BACTERIUM Biological nitrogen and phosphorus removal and changes in microbial community structure in a membrane bioreactor: Effect of different carbon sources Article 10.1016/j.watres.2007.06.062 1 WATER RESEARCH, v.42, no.1-2, pp.198 - 210 WATER RESEARCH 42 1-2 198 210 scie scopus 000253045900019 2-s2.0-37349016045 Engineering, Environmental Environmental Sciences Water Resources Engineering Environmental Sciences & Ecology Water Resources Article GLYCOGEN-ACCUMULATING ORGANISMS TARGETED OLIGONUCLEOTIDE PROBES WASTE-WATER ACTIVATED-SLUDGE ISOPRENOID QUINONE DIFFERENT RATIOS GEN. NOV. IDENTIFICATION POLYPHOSPHATE BACTERIUM nitrogen removal enhanced biological phosphorus removal quinone profile fluorescent in situ hybridization (FISH) carbon sources sequencing anaerobic/anoxic-aerobic membrane bioreactor (SAM)