Changes in biofilm architecture with addition of membrane fouling reducer in a membrane bioreactor

Lee, Woo Nyoung; Chang, Ih-Seop; Hwang, Byung Kook; Park, Pyung Kyu; Lee, Chung Hak; Huang, Xia

doi:10.1016/j.procbio.2006.12.003

Cited by 103 publications

(42 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It results in severe performance loss, modifies membrane surface properties and demands costly periodic cleaning or membrane replacement (8,25). Many studies have been focused on the alleviation of membrane fouling, for example, by backwashing, aeration, intermittent suction, module modification, addition of an inorganic coagulant and addition of a membrane fouling reducer (1,13). Chlorine is the most frequently applied agent in the biofouling control, but its destructive effect on certain membrane material, especially on polyamide reverse osmosis (RO) membrane due to the residual concentration, have already been reported (31).…”

Section: Introductionmentioning

confidence: 99%

2(5H)-Furanone: a prospective strategy for biofouling-control in membrane biofilm bacteria by quorum sensing inhibition

Ponnusamy¹,

Paul²,

Kim³

et al. 2010

Braz. J. Microbiol.

View full text Add to dashboard Cite

Biofouling of membranes demands costly periodic cleaning and membrane replacement. A sustainable and environmentally friendly solution for maintenance is not available and would be of great interest for many purposes including economical. As complex biofilm formation by environmental strains is the major cause of biofouling and biofilm formation in most cases are controlled by N-Acylhomoserine lactone (AHL)-mediated Quorum Sensing (QS). An effort was made to understand the appropriateness of 2(5H)-furanone, to use against biofouling of membranes. QS inhibition activity by 2(5H)-furanone was studied using bioindicator strains and known AHLs of different acyl chain lengths. The biofilm inhibition was studied by growth analysis on polystyrene plate of Aeromonas hyrdrophila, an environmental biofilm strain isolated from a bio-fouled reverse osmosis (RO) membrane. Results showed a QS inhibition activity against a wide range of AHLs and also biofilm formation by 2(5H)-furanone, which is believed to act as a potential quorum inhibition agent in a bacterial biofilm community.

show abstract

Section: Introductionmentioning

confidence: 99%

2(5H)-Furanone: a prospective strategy for biofouling-control in membrane biofilm bacteria by quorum sensing inhibition

Ponnusamy¹,

Paul²,

Kim³

et al. 2010

Braz. J. Microbiol.

View full text Add to dashboard Cite

show abstract

“…In this study, higher zeta potential values (À0.86 ± 1.07 mV) of activated sludge were measured in the MBR-G than those in the CMBR (À11.41 ± 5.06 mV), which demonstrated the negative surface charge of the microbial flocs was reduced or neutralized by Gemfloc Ò . Subsequently, the flocs could attach to each other and promote the production of larger flocs through the charge neutralization mechanism [29]. Ji et al [14] also reported similar results that the charge neutrality was responsible for enhancing flocculation ability of sludge flocs when adding PAM-MGMS into the MBR.…”

Section: Mixed Liquor Suspended Solids (Mlss) Concentration Mixed LImentioning

confidence: 88%

“…On contrary, lower membrane fouling propensity of the MBR-G was due to formation of more porous and permeable cake layer caused by the deposition of larger and looser sludge flocs on membrane surface [16]. Previous studies have suggested that SMP induces internal fouling and decreases filterability since SMP can not only block membrane pores, but also block the pores and spaces between particles in the cake layer [29,[43][44][45]. Moreover, SMP C possessing partially hydrophilic nature could cause irreversible fouling by forming a thin gel layer on membrane compared to SMP P [6,[46][47][48].…”

mentioning

confidence: 97%

Membrane fouling reduction and improvement of sludge characteristics by bioflocculant addition in submerged membrane bioreactor

Deng

Guo

Ngo

et al. 2015

Separation and Purification Technology

View full text Add to dashboard Cite

a b s t r a c tThe effectiveness of a green bioflocculant (Gemfloc Ò ) on enhanced performance of a submerged membrane bioreactor (SMBR) was evaluated in terms of membrane fouling reduction and sludge characterization. Two MBRs were operated parallelly in this study, namely conventional MBR (CMBR) and MBR with Gemfloc Ò addition (MBR-G). Results showed mitigated membrane fouling through Gemfloc Ò addition in terms of cake layer formation and pore blocking. When compared to the CMBR, in spite of more extracellular polymeric substances (EPS) presented in activated sludge, the MBR-G demonstrated less soluble microbial products (SMP), larger sludge flocs, higher zeta potential and greater relative hydrophobicity of sludge flocs, which decreased cake layer resistance and pore blocking resistance. The reduced cake layer resistance in the MBR-G could be also ascribed to less growth of suspended biomass, lower sludge viscosity, as well as less EPS, SMP and biopolymer clusters in the cake layer. In addition, a modified resistance-in-series model was employed by considering SMP and mixed liquor suspended solids. The simulated results implied that the model could predict the influence of sludge characteristics on membrane fouling behavior of the SMBR.

show abstract

“…This helps in the enhancement of mass transfer efficiency significantly. However, irrespective of advantages such as easy scale up, high throughput etc., the fouling of polymeric membrane remains a major problem, which reduces productivity and increases maintenance and operating costs [13]. Particularly when the carries has to undergo different chemical reaction to immobilize the enzyme, this may result in the reduction of pore size and enhance the fouling.…”

Section: Introductionmentioning

confidence: 99%

Studies of Penicillin G Acylase Immobilization Using Highly Porous Cellulose-Based Polymeric Membrane

Adikane

Thakar

2009

Appl Biochem Biotechnol

View full text Add to dashboard Cite

The different ionic molecules/compounds were used as a ligand for the immobilization of penicillin G acylase on the highly porous cellulose-based polymeric membrane having buffer flux 1,746 LMH (L m(-2) h(-1)) at 0.5 bar pressure. The immobilized enzyme activity around 250 U(App) was obtained with the ligand such as proline, tryptophan, casein acid hydrolysate, and brilliant green. Comparatively, proline showed less IMY% (percentage immobilization yield--58) but higher RTA% (percentage of activity retention--71) and specific activity (145 U(App) g(-1)). However, the crosslinked preparation of brilliant green obtained using glutaraldehyde showed 82 +/- 2.7% immobilized enzyme activity after the completion of successive five cycles. In comparison with the free enzyme, the enzyme immobilized on the brilliant green coupled membrane showed around 2.4-fold increase in K (m) value (47.4 mM) as well as similar optimum pH (7.2) and temperature (40 degrees C). The immobilized enzyme retained almost 50% activity after 107 days and 50 cycles of operation. Almost 50% decrease in buffer flux after enzyme immobilization was observed. At the end of the 30 cycles, flux pattern shows around 38% decrease in buffer flux however, after 16 cycles of operation flux moves closer towards the steady state.

show abstract

Changes in biofilm architecture with addition of membrane fouling reducer in a membrane bioreactor

Cited by 103 publications

References 22 publications

2(5H)-Furanone: a prospective strategy for biofouling-control in membrane biofilm bacteria by quorum sensing inhibition

2(5H)-Furanone: a prospective strategy for biofouling-control in membrane biofilm bacteria by quorum sensing inhibition

Membrane fouling reduction and improvement of sludge characteristics by bioflocculant addition in submerged membrane bioreactor

Studies of Penicillin G Acylase Immobilization Using Highly Porous Cellulose-Based Polymeric Membrane

Contact Info

Product

Resources

About