scholarly journals Microbial Population Dynamics and Ecosystem Functions of Anoxic/Aerobic Granular Sludge in Sequencing Batch Reactors Operated at Different Organic Loading Rates

2017 ◽  
Vol 8 ◽  
Author(s):  
Enikö Szabó ◽  
Raquel Liébana ◽  
Malte Hermansson ◽  
Oskar Modin ◽  
Frank Persson ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Microbial Population ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Ecosystem Functions ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Organic Loading ◽  
Loading Rates ◽  
Microbial Population Dynamics

Microbial population dynamics of granular aerobic sequencing batch reactors during start-up and steady state periods

2010 ◽  
Vol 62 (6) ◽  
pp. 1281-1287 ◽  
Author(s):  
Y. Q. Liu ◽  
Y. H. Kong ◽  
R. Zhang ◽  
X. Zhang ◽  
F. S. Wong ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Community Structure ◽  
Steady State ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Microbial Population ◽  
Granular Sludge ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Microbial Population Dynamics

This study investigates microbial population dynamics in granular sequencing batch reactors (GSBR). The experimental results of DGGE fingerprint of sludge demonstrated that the microbial community structure of sludge shifted significantly during granulation period and nutrient removal improvement period. After reactor performance and physical characteristics of sludge reached steady state, microbial population of sludge became relatively stable. The high similarity of microbial community structure between co-existed flocculated sludge and granular sludge in GSBR at different operation phases indicated that similar microbial consortium could exist in compact aggregated form or in amorphous flocculated form. Therefore, strong selection pressure was still required to wash out flocs to maintain the stability of reactor operation. In addition, it was found that substrate type had considerable impact on microbial species selection and enrichment in granular sludge. The clone library of granular sludge showed that microbial species in divisions of α-Proteobacteria, β-Proteobacteria, γ-Proteobacteria and Bacteroidetes existed within acetate-fed granule communities and Thauera spp. from β-Proteobacteria accounted for 49% of the total clones in the whole clone library. It is thus speculated that Thauera spp. are important for the formation of acetate-fed granules under the conditions used in this study, maintaining the integrity of granules or substrate degradation.

Wastewater fermentation and nutrient removal in sequencing batch reactors

1998 ◽  
Vol 38 (1) ◽  
pp. 255-264 ◽  
Author(s):  
Germán Cuevas-Rodríguez ◽  
Óscar González-Barceló ◽  
Simón González-Martínez
Keyword(s):  
Activated Sludge ◽  
Volatile Fatty Acids ◽  
Organic Load ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Organic Loading ◽  
Nitrogen And Phosphorus ◽  
Loading Rates ◽  
Average Value ◽  
Experimental Runs

This research project was conducted to analyze the performance of a SBR reactor when being fed with anaerobically fermented wastewater. Important was to determine the capacity of the system to remove nitrogen and phosphorus. Two SBR reactors, each one with a volume of 980 liters, were used: one used as fermenter and the other as activated sludge SBR. Using 8-hour cycles, the reactors were operated and studied during 269 days. The fermenter produced an effluent with an average value of 223±24 mg/l of volatile fatty acids. The activated sludge SBR was tested under 3 organic loading rates of 0.13, 0.25, and 0.35 kgCODtotal/kgTSS·d. For the three tested organic loading rates, PO4-P concentrations under 1.1 mg/l and COD between 37 and 38 mg/l were consistently achieved. Exceptionally high NH4-N influent values were measured during the time of the experimentation with the organic load of 0.25 kgCODtotal/kgTSS·d, not reaching in this case full nitrification. Denitrification was observed during the fill phase in every cycle. SVI values between 40 and 70 were determined during the experimental runs.

Formation and properties of pure-oxygen aerobic granular sludge (POAGS) at high organic loading rates (HOLR)

2020 ◽  
Vol 179 ◽  
pp. 45-53
Author(s):  
Fanghui Pan ◽  
Youbao Wang ◽  
Yongbin Jiang ◽  
Xinxi Zhang ◽  
Kunxiao Huang ◽  
...  
Keyword(s):  
Granular Sludge ◽  
Pure Oxygen ◽  
Aerobic Granular Sludge ◽  
Organic Loading ◽  
Loading Rates
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