Presence of biofilms on ultrafiltration membrane surfaces increases the quality of permeate produced during ultra-low pressure gravity-driven membrane filtration

Derlon, Nicolas; Mimoso, Joao; Klein, Theresa; Koetzsch, Stefan; Morgenroth, Eberhard

doi:10.1016/j.watres.2014.04.045

Cited by 88 publications

(22 citation statements)

References 24 publications

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“…A decreased rejection or even a negative rejection can be explained by degradation and leaching processes within the bio-fouling layer. Similar results were published by Derlon et al [13]: Biofilms initially removed assimilable organic matter (AOC), but the biofilm started to leach AOC after extended operation resulting in an elevated AOC content in the permeate.…”

Section: Role Of the Bio-fouling Layer: Impact On Organics Removalsupporting

confidence: 86%

“…Chomiak et al [12] found that the "biofilm + membrane" composite retained a larger amount of biodegradable foulants than the membrane alone, due to the activity of the biofilm. Derlon et al [13] found that a young biofilm on membranes increased the permeate quality due to the degradation of AOC (> 80%). However, the hydrolysis of the organics accumulated on membrane surface increased the AOC content of the permeate in older biofilms.…”

Section: Introductionmentioning

confidence: 99%

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A low energy gravity-driven membrane bioreactor system for grey water treatment: Permeability and removal performance of organics

Ding

Liang

et al. 2017

Journal of Membrane Science

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Synthetic grey water was treated with a low-pressure gravity-driven membrane bioreactor (GDMBR) system. The system was operated without any direct shear at the membrane surface and without any cleaning or flushing. In order to reduce energy consumption, one reactor was operated without aeration and the results were compared with an aerated reactor. Although the dissolved oxygen content was low (0.4-0.6 mg/L) in the nonaerated system, a stable permeability was observed at a level of around 20 L/m 2 hbar (flux of 1 L/m 2 h). The fouling resistance was dominated by the bio-fouling layer, which could be removed hydraulically. In comparison to the aerated system, the bio-fouling layer grown

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Section: Role Of the Bio-fouling Layer: Impact On Organics Removalsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

A low energy gravity-driven membrane bioreactor system for grey water treatment: Permeability and removal performance of organics

Ding

Liang

et al. 2017

Journal of Membrane Science

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“…1.1 were measured using an automatic total organic carbon analyser (TOC-V, Shimadzu, Japan). More details about the sample preparation and injection in the analyser can be found for the organic carbon measurement in Derlon et al (2014). Biofilms of different ages were scratched from the membrane surface using a cell scraper and re-suspended in 50 mL of nanopure water.…”

Section: Biofilm Compositionmentioning

confidence: 99%

The composition and compression of biofilms developed on ultrafiltration membranes determine hydraulic biofilm resistance

et al. 2016

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“…The biofilm of GDM filtration systems can improve permeate quality [11], e.g., it may delay microbial regrowth via the reduction of readily available organic carbon [16]. Moreover, biofilms were shown to be effective also against cyanotoxins: MCs in concentrations typically observed during HABs can be completely removed after an adaptation period of the biofilms of approximately 2 weeks [43].…”

Section: Introductionmentioning

confidence: 99%

Priming of microbial microcystin degradation in biomass-fed gravity driven membrane filtration biofilms

Silva

Blom

Yankova

et al. 2018

Systematic and Applied Microbiology

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Gravity-driven membrane (GDM) filtration is a promising tool for low-cost decentralized drinking water production. The biofilms in GDM systems are able of removing harmful chemical components, particularly toxic cyanobacterial metabolites such as microcystins (MCs). This is relevant for the application of GDM filtration because anthropogenic nutrient input and climate change have led to an increase of toxic cyanobacterial blooms. However, removal of MCs in newly developing GDM biofilms is only established after a prolonged period of time. Since cyanobacterial blooms are transient phenomena, it is important to understand MC removal in mature biofilms with or without prior toxin exposure. In this study, the microbial community composition of GDM biofilms was investigated in systems fed with water from a lake with periodic blooms of MC-producing cyanobacteria. Two out of three experimental treatments were supplemented with dead biomass of a MC-containing cyanobacterial strain, or of a non-toxic mutant, respectively. Analysis of bacterial rRNA genes revealed that both biomass-amended treatments were significantly more similar to each other than to a non-supplemented control. Therefore, it was hypothesized that biofilms could potentially be 'primed' for rapid MC removal by prior addition of non-toxic biomass. A subsequent experiment showed that MC removal developed significantly faster in mature biofilms that were pre-fed with biomass from the mutant strain than in unamended controls, indicating that MC degradation was a facultative trait of bacterial populations in GDM biofilms. The significant enrichment of bacteria related to both aerobic and anaerobic MC degraders suggested that this process might have occurred in parallel in different microniches.

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Presence of biofilms on ultrafiltration membrane surfaces increases the quality of permeate produced during ultra-low pressure gravity-driven membrane filtration

Cited by 88 publications

References 24 publications

A low energy gravity-driven membrane bioreactor system for grey water treatment: Permeability and removal performance of organics

A low energy gravity-driven membrane bioreactor system for grey water treatment: Permeability and removal performance of organics

The composition and compression of biofilms developed on ultrafiltration membranes determine hydraulic biofilm resistance

Priming of microbial microcystin degradation in biomass-fed gravity driven membrane filtration biofilms

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