Characterization of biofouling in a lab-scale forward osmosis membrane bioreactor (FOMBR)

Zhang, Qiaoyun; Jie, Yap Wei; Loong, Winson Lay Chee; Zhang, Jinsong; Fane, Anthony G.; Kjelleberg, Staffan; Rice, Scott A.; McDougald, Diane

doi:10.1016/j.watres.2014.03.052

Cited by 93 publications

(53 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Polysaccharides are one of the major components of the biofilm matrix (Zhang et al, 2014b). Considering the fact that the a-and b-D-glucopyranose polysaccharides have different w a t e r r e s e a r c h 7 5 ( 2 0 1 5 ) 1 8 8 e2 0 0 biodegradability and play different roles in biological systems such as MBRs (Chen et al, 2006), their variations in the biofouling layer during the operation of OMBR were observed by the CLSM combined with the fluorescent probes of ConA and CW, respectively.…”

Section: Clsm Images Of Polysaccharidesmentioning

confidence: 99%

“…Subsequently, Qiu and Ting (2014) further demonstrated that small sludge floc/particles and EPS (in particular, proteins) were enriched in the FO membrane fouling layer according to the analyses of the membrane foulants. Meanwhile, the FO membrane-associated biofilms were characterized by confocal laser scanning microscopy (CLSM) and rRNA gene-tagged pyro-sequencing (Zhang et al, 2014b). Based on these results on the characterization of the membrane foulants, it could be concluded that the biofouling integrated the EPS and bacterial cells is a main contributor to OMBR fouling.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In situ observation of the growth of biofouling layer in osmotic membrane bioreactors by multiple fluorescence labeling and confocal laser scanning microscopy

et al. 2015

View full text Add to dashboard Cite

Section: Clsm Images Of Polysaccharidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situ observation of the growth of biofouling layer in osmotic membrane bioreactors by multiple fluorescence labeling and confocal laser scanning microscopy

et al. 2015

View full text Add to dashboard Cite

“…The majority of studies exploring FO membrane fouling mechanisms have used synthetic feed solutions [3,20,22,29,[36][37][38][49][50][51][52][53][54][55][56][57][58]; however, relatively few studies have examined OMBR membrane fouling using real wastewaters [1,2,43,59,60]. This is a major shortcoming in the literature because the use of synthetic or real wastewater can substantially influence the extent and characteristics of the fouling layer and membrane integrity [61].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of forward osmosis membrane performance and fouling during long-term osmotic membrane bioreactor study

Bell

Holloway

Cath

2016

Journal of Membrane Science

View full text Add to dashboard Cite

Forward osmosis membrane performance and fouling was studied during 100 days of continuous activated sludge treatment. The purpose of the study was to compare the performance and fouling of commercial cellulose triacetate and newly developed polyamide thin film composite membranes that treated high salinity and low salinity activated sludge from two membrane bioreactors. Water flux, reverse salt flux, and specific reverse salt flux were measured to evaluate the performance of virgin and fouled membranes. Membrane autopsy was used to investigate foulant composition and compare physicochemical membrane properties before and after fouling. The results indicated that both membrane types attained steady-state water flux over 100 days, characterized by an initial decline and subsequent steady-state period. Biofouling and organic fouling caused overall water flux decline, in which foulants were identical between membrane and activated sludge types. Water flux results were similar for the two activated sludge types and demonstrated that FO membrane performance and fouling was independent of total dissolved solids, calcium, and mixed liquor suspended solid concentrations. Lastly, virgin membrane properties (i.e., hydrophilicity and surface roughness) did not contribute substantially to membrane fouling. Cellulose triacetate membranes outperformed thin film composite membranes, with lower fouling propensity, higher water flux, lower reverse salt flux, and lower specific reverse salt flux.

show abstract

“…Despite the potential of OMBR, it is surprising to note the dearth of information regarding the effects of aeration on membrane fouling and biological performance of OMBR in the literature. Recent studies by Zhang et al [14] and Qiu et al [15] are the only two exceptions. Zhang et al [14] observed a thick biofilm on the FO membrane surface and attributed it to the low aeration rate used in their study.…”

mentioning

confidence: 97%

“…Recent studies by Zhang et al [14] and Qiu et al [15] are the only two exceptions. Zhang et al [14] observed a thick biofilm on the FO membrane surface and attributed it to the low aeration rate used in their study. It is noteworthy that both Zhang et al [14] and Qiu et al [15] did not attempt to investigate influence of aeration and other operating conditions (e.g.…”

mentioning

confidence: 97%

Water extraction from mixed liquor of an aerobic bioreactor by forward osmosis: Membrane fouling and biomass characteristics assessment

Luo

Hai

Price

et al. 2015

Separation and Purification Technology

View full text Add to dashboard Cite

This study investigated membrane fouling and biomass characteristics during water extraction from mixed liquor of an aerobic bioreactor by a submerged forward osmosis (FO) system. As the sludge concentration in the reactor increased from 0 to 20 g/L, fouling of the FO membrane increased but was much less severe than that of a reference microfiltration membrane. The results also indicate that aeration can be used to effectively control membrane fouling. By increasing the draw solute concentration, as expected, the initial water flux was increased. However, there appears to be a critical water flux above which severe membrane fouling was encountered. A short-term osmotic membrane bioreactor experiment showed build-up of salinity in the bioreactor due to the reverse draw solute transport and inorganic salts rejection by the FO membrane. Salinity build-up in the bioreactor reduced the permeate flux and sludge production, and at the same time, altered the biomass characteristics, leading to more soluble microbial products and less extracellular polymeric substances in the microbial mass. Additionally, the inhibitory effects of the increased salinity on biomass and the high rejection capacity of FO led to the build-up of ammonia and ortho-phosphate in the bioreactor. Disciplines Engineering | Science and Technology Studies AbstractThis study investigated membrane fouling and biomass characteristics during water extraction from mixed liquor of an aerobic bioreactor by a submerged forward osmosis (FO) system. As the sludge concentration in the reactor increased from 0 to 20 g/L, fouling of the FO membrane increased but was much less severe than that of the microfiltration membrane. The results also indicate that aeration can be used to effectively control membrane fouling. By increasing the draw solute concentration, as expected, the initial water flux was increased. However, there appears to be a critical water flux above which the higher initial water flux was associated with considerably more severe membrane fouling. A short-term osmotic membrane bioreactor experiment showed the build-up of salinity in the bioreactor due to the reverse draw solute transport and inorganic salts rejection by the FO membrane. Salinity build-up in the bioreactor reduced the permeate flux and sludge production, and at the same time, altered the biomass characteristics, leading to more soluble microbial products and less extracellular polymeric substances in the microbial mass. Additionally, the inhibitory effects of the increased salinity on biomass and the high rejection capacity of FO also led to the build-up of ammonia and ortho-phosphate in the bioreactor.

show abstract

Characterization of biofouling in a lab-scale forward osmosis membrane bioreactor (FOMBR)

Cited by 93 publications

References 37 publications

In situ observation of the growth of biofouling layer in osmotic membrane bioreactors by multiple fluorescence labeling and confocal laser scanning microscopy

In situ observation of the growth of biofouling layer in osmotic membrane bioreactors by multiple fluorescence labeling and confocal laser scanning microscopy

Evaluation of forward osmosis membrane performance and fouling during long-term osmotic membrane bioreactor study

Water extraction from mixed liquor of an aerobic bioreactor by forward osmosis: Membrane fouling and biomass characteristics assessment

Contact Info

Product

Resources

About