Comparison of sludge characteristics and performance of a submerged membrane bioreactor and an activated sludge process at high solids retention time

Massé, Anthony; Spérandio, Mathieu; Cabassud, Corinne

doi:10.1016/j.watres.2006.04.015

Cited by 302 publications

(118 citation statements)

References 27 publications

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“…The highest nitrification gene intensity within LFB might be due to its longest SRT, although LFA was of a higher DO concentration and BH was of higher TN inf and NH 4 + -N inf. Besides, higher SRT allows longer contacting time between pollutants and bacteria, giving a better hydrolyzation and degradation of organic molecules (Massé et al 2006). This might give an explanation to the result that LFB was of higher intensity of carbon degradation genes than LFA.…”

Section: Attributing Functional Gene Differentiations To Environmentamentioning

confidence: 97%

Overall functional gene diversity of microbial communities in three full-scale activated sludge bioreactors

Xia

Wang

Wen

et al. 2014

Appl Microbiol Biotechnol

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Understanding microbial community composition is thought to be crucial for improving process functioning and stabilities of full-scale activated sludge reactors in wastewater treatment plants (WWTPs). However, functional gene compositions of microbial communities within them have not been clearly elucidated. To gain a complete picture of microbial community, in this study, GeoChip 4.2 was used to profile the overall functional genes of three full-scale activated sludge bioreactors, the 16S rRNA gene diversities of which had been unveiled by 454-pyrosequencing in our previous investigation. Triplicate activated sludge samples from each system were analyzed, with the detection of 38,507 to 40,654 functional genes. A high similarity of 77.3-81.2 % shared functional genes was noted among the nine samples, verified by the high 16S rRNA gene similarity with shared operational taxonomic units (OTUs) constituting 66.4-70.0 % of the detected sequences in each system. Correlation analyses showed that the abundances of a wide array of functional genes were associated with system performances. For example, the abundances of carbon degradation genes were strongly correlated to chemical oxygen demand (COD) removal efficiencies (r=0.8697, P<0.01). Lastly, we found that sludge retention time (SRT), influent total nitrogen concentrations (TN inf), and dissolved oxygen (DO) concentrations were key environmental factors shaping the overall functional genes. Together, the results revealed vast functional gene diversity and some links between the functional gene compositions and microbe-mediated processes.

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Section: Attributing Functional Gene Differentiations To Environmentamentioning

confidence: 97%

Overall functional gene diversity of microbial communities in three full-scale activated sludge bioreactors

Xia

Wang

Wen

et al. 2014

Appl Microbiol Biotechnol

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“…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). Ng et al (2006) operated MBRs at SRTs of 3, 5, 10 and 20 d, and found the concentrations of total organic carbon, proteins, and carbohydrates in the mixed liquor supernatant increased with decreasing SRT.…”

Section: Introductionmentioning

confidence: 99%

“…In most of available publications, MBRs were operated at either an extremely long (Masse et al, 2006) or an extremely short SRT (Ng and Hermanowicz, 2005). Some studies were based on synthetic wastewater.…”

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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“…12 Masse et al (2006) compared between submerged MBR and activated sludge process (ASP) and found that there was no significant difference in sludge production for both operations, but the sludge production in submerged MBR decreased as SRT increased. 13 U-shaped membrane in bioreactor has the tendency to foul faster than any other type of membrane. Nonetheless, it is usually selected because it is less costly, compact, has low water hold-up and is easy to clean by backwashing.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time

Mutamim

Noor²

2017

Chem. Eng. Res. Bull.

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This paper presents a study on the performance of an Aerobic Submerged u-shaped membrane bioreactor (ASMBR) in treating sulfidic spent caustic (SSC) in terms of mixed liquor suspended solid (MLSS) concentration and solid retention time (SRT). SSC wastewater is categorized as high strength wastewater and consists of high inorganic and organic matter. U-shape membrane bioreactors have a higher tendency to foul compared to other types of MBR. MLSS concentration and SRT are the major parameters when operating membrane bioreactor. In this study, COD removal recorded reduction of more than 95% for average MLSS concentration runs and 90% for SRTs runs. Meanwhile, sulfide was removed 99%, and formed up to 79% of sulfate. The biofouling for MLSS concentration and SRTs were observed through TMP rate change and TMP average performance, TMP trend and SMP and EPS trends. Biocake layer and biolayer deposited on membrane surface was found influenced by biomass, the inert particulate biomass products accumulating in the reactor.

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Comparison of sludge characteristics and performance of a submerged membrane bioreactor and an activated sludge process at high solids retention time

Cited by 302 publications

References 27 publications

Overall functional gene diversity of microbial communities in three full-scale activated sludge bioreactors

Overall functional gene diversity of microbial communities in three full-scale activated sludge bioreactors

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

Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time

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