Impact of organic nutrient load on biomass accumulation, feed channel pressure drop increase and permeate flux decline in membrane systems

Bucs, Szilárd; Linares, Rodrigo Valladares; Loosdrecht, M.C.M. van; Kruithof, Joop C.; Vrouwenvelder, Johannes S.

doi:10.1016/j.watres.2014.09.005

Cited by 58 publications

(35 citation statements)

References 70 publications

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“…The selection of the biomass parameter ATP was based on earlier studies [35,36]. ATP measurements were performed using an ATP analyser (Advanced Luminometer, Celsis, Belgium).…”

Section: Evaluation Of the Biomass Concentrationmentioning

confidence: 99%

Coating of reverse osmosis membranes with amphiphilic copolymers for biofouling control

Bucs¹,

Linares²,

Siddiqui³

et al. 2017

Desalination and Water Treatment

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a b s t r a c tSurface coating of membranes may be a promising option to control biofilm development and biofouling impact on membrane performance of spiral-wound reverse osmosis (RO) systems. The objective of this study was to investigate the impact of an amphiphilic copolymer coating on biofilm formation and biofouling control. The coating was composed of both hydrophilic and hydrophobic monomers hydroxyethyl methacrylate (HEMA) and perfluorodecyl acrylate (PFA), respectively. Commercial RO membranes were coated with HEMA-PFA copolymer film. Long and short term biofouling studies with coated and uncoated membranes and feed spacer were performed using membrane fouling simulators (MFSs) operated in parallel, fed with water containing nutrients. For the long-term studies pressure drop development in time was monitored and after eight days the MFSs were opened and the accumulated biofilm on the membrane and spacer sheets was quantified and characterized. The presence of the membrane coating was determined using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). Results showed that the amphiphilic coating (i) delayed biofouling (a lower pressure drop increase by a factor of 3 and a lower accumulated active biomass amount by a factor of 6), (ii) influenced the biofilm composition (23% lower polysaccharides and 132% higher protein content) and (iii) was still completely present on the membrane at the end of the biofouling study, showing that the coating was strongly attached to the membrane surface. Using coated membranes and feed spacers in combination with advanced cleaning strategies may be a suitable way to control biofouling.

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“…The selection of the biomass parameter ATP was based on earlier studies [35,36]. ATP measurements were performed using an ATP analyser (Advanced Luminometer, Celsis, Belgium).…”

Section: Evaluation Of the Biomass Concentrationmentioning

confidence: 99%

Coating of reverse osmosis membranes with amphiphilic copolymers for biofouling control

Bucs¹,

Linares²,

Siddiqui³

et al. 2017

Desalination and Water Treatment

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“…The yield value of the OS was calculated from the equation: (2) where m OS,F and m OS,R are the mass of OS in the feed and retentate, respectively.…”

Section: Calculationsmentioning

confidence: 99%

“…The degree of severity is different from case to case. For example, biofouling (biofilm formation), one of the main operating problems, has been discussed in numerous studies [1][2][3]. The difficulties are not only to be considered from a practical point of view.…”

Section: Introductionmentioning

confidence: 99%

Fractionation of a galacto-oligosaccharides solution at low and high temperature using nanofiltration

Pruksasri

Nguyễn

Haltrich

et al. 2015

Separation and Purification Technology

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Like in many applications, solutions of high sugar content can cause serious problems due to microorganism contaminations. Hence, the main aim of this work was to study a nanofiltration process for GOS purification at 5 °C and 60 °C that may circumvent or reduce potential microbial growth. Process performances and rejection behaviors of monosaccharide as well as individual GOS components were compared. Operating at 5 °C is more advantageous especially with respect to the oligosaccharide (OS) recovery yield. Using a NF membrane (NP030) at 45 bar, a product purity of 85% (based on monosaccharide content) and an OS recovery yield of 82% could be achieved. However, a low average permeate flux of 3 L/m 2 h had to be accepted. A diafiltration step improved product purity to 90% with 30% losses of OS. A qualitative theoretical discussion shows that a possible change of the pore radius distribution depending on temperature could play a role in solute rejection as well as selectivity.

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“…However, factors, such as nutrient stress [47,50,51], microbial community composition and temperature will impact on the regulation of the expression of TEP precursors and on the thickness, structure, stability and density of the biofilm formed [2,52]. Bucs et al also showed that nutrient concentration influences the amount of accumulated biomass on nanofiltration, RO and forward osmosis membranes [52].…”

Section: Biofilm Precursorsmentioning

confidence: 99%

“…Previous studies have also identified precursors of biofilm formation as TEP, bacteria, phytoplankton (in particular diatoms) and nutrient concentrations [6,47,52].…”

Section: Biofilm Precursorsmentioning

confidence: 99%

Analysis of raw and pre-treated seawater for potential biofouling precursors

et al. 2015

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Impact of organic nutrient load on biomass accumulation, feed channel pressure drop increase and permeate flux decline in membrane systems

Cited by 58 publications

References 70 publications

Coating of reverse osmosis membranes with amphiphilic copolymers for biofouling control

Coating of reverse osmosis membranes with amphiphilic copolymers for biofouling control

Fractionation of a galacto-oligosaccharides solution at low and high temperature using nanofiltration

Analysis of raw and pre-treated seawater for potential biofouling precursors

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