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

Handle URI:
http://hdl.handle.net/10754/563883
Title:
Impact of organic nutrient load on biomass accumulation, feed channel pressure drop increase and permeate flux decline in membrane systems
Authors:
Bucs, Szilard; Valladares Linares, Rodrigo ( 0000-0003-3790-3249 ) ; van Loosdrecht, Mark C.M.; Kruithof, Joop C.; Vrouwenvelder, Johannes S. ( 0000-0003-2668-2057 )
Abstract:
The influence of organic nutrient load on biomass accumulation (biofouling) and pressure drop development in membrane filtration systems was investigated. Nutrient load is the product of nutrient concentration and linear flow velocity. Biofouling - excessive growth of microbial biomass in membrane systems - hampers membrane performance. The influence of biodegradable organic nutrient load on biofouling was investigated at varying (i) crossflow velocity, (ii) nutrient concentration, (iii) shear, and (iv) feed spacer thickness. Experimental studies were performed with membrane fouling simulators (MFSs) containing a reverse osmosis (RO) membrane and a 31 mil thick feed spacer, commonly applied in practice in RO and nanofiltration (NF) spiral-wound membrane modules. Numerical modeling studies were done with identical feed spacer geometry differing in thickness (28, 31 and 34 mil). Additionally, experiments were done applying a forward osmosis (FO) membrane with varying spacer thickness (28, 31 and 34 mil), addressing the permeate flux decline and biofilm development. Assessed were the development of feed channel pressure drop (MFS studies), permeate flux (FO studies) and accumulated biomass amount measured by adenosine triphosphate (ATP) and total organic carbon (TOC).Our studies showed that the organic nutrient load determined the accumulated amount of biomass. The same amount of accumulated biomass was found at constant nutrient load irrespective of linear flow velocity, shear, and/or feed spacer thickness. The impact of the same amount of accumulated biomass on feed channel pressure drop and permeate flux was influenced by membrane process design and operational conditions. Reducing the nutrient load by pretreatment slowed-down the biofilm formation. The impact of accumulated biomass on membrane performance was reduced by applying a lower crossflow velocity and/or a thicker and/or a modified geometry feed spacer. The results indicate that cleanings can be delayed but are unavoidable.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Environmental Science and Engineering Program
Publisher:
Elsevier BV
Journal:
Water Research
Issue Date:
Dec-2014
DOI:
10.1016/j.watres.2014.09.005
Type:
Article
ISSN:
00431354
Sponsors:
This work was performed at Wetsus, Centre of Excellence for Sustainable Water Technology (www.wetsus.n1). Wetsus is funded by the Dutch Ministry of Economic Affairs, the European Union European Regional Development Fund, the Province of Fryslan, the City of Leeuwarden and by the EZ-KOMPAS Program of the "Samenwerkingsverband Noord-Nederland". The work was funded by Wetsus, the King Abdullah University of Science and Technology (KAUST) and Evides waterbedrijf. The authors like to thank the participants of the Wetsus research theme "Biofouling", KAUST and Evides waterbedrijf for the fruitful discussions and their financial support.
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorBucs, Szilarden
dc.contributor.authorValladares Linares, Rodrigoen
dc.contributor.authorvan Loosdrecht, Mark C.M.en
dc.contributor.authorKruithof, Joop C.en
dc.contributor.authorVrouwenvelder, Johannes S.en
dc.date.accessioned2015-08-03T12:18:15Zen
dc.date.available2015-08-03T12:18:15Zen
dc.date.issued2014-12en
dc.identifier.issn00431354en
dc.identifier.doi10.1016/j.watres.2014.09.005en
dc.identifier.urihttp://hdl.handle.net/10754/563883en
dc.description.abstractThe influence of organic nutrient load on biomass accumulation (biofouling) and pressure drop development in membrane filtration systems was investigated. Nutrient load is the product of nutrient concentration and linear flow velocity. Biofouling - excessive growth of microbial biomass in membrane systems - hampers membrane performance. The influence of biodegradable organic nutrient load on biofouling was investigated at varying (i) crossflow velocity, (ii) nutrient concentration, (iii) shear, and (iv) feed spacer thickness. Experimental studies were performed with membrane fouling simulators (MFSs) containing a reverse osmosis (RO) membrane and a 31 mil thick feed spacer, commonly applied in practice in RO and nanofiltration (NF) spiral-wound membrane modules. Numerical modeling studies were done with identical feed spacer geometry differing in thickness (28, 31 and 34 mil). Additionally, experiments were done applying a forward osmosis (FO) membrane with varying spacer thickness (28, 31 and 34 mil), addressing the permeate flux decline and biofilm development. Assessed were the development of feed channel pressure drop (MFS studies), permeate flux (FO studies) and accumulated biomass amount measured by adenosine triphosphate (ATP) and total organic carbon (TOC).Our studies showed that the organic nutrient load determined the accumulated amount of biomass. The same amount of accumulated biomass was found at constant nutrient load irrespective of linear flow velocity, shear, and/or feed spacer thickness. The impact of the same amount of accumulated biomass on feed channel pressure drop and permeate flux was influenced by membrane process design and operational conditions. Reducing the nutrient load by pretreatment slowed-down the biofilm formation. The impact of accumulated biomass on membrane performance was reduced by applying a lower crossflow velocity and/or a thicker and/or a modified geometry feed spacer. The results indicate that cleanings can be delayed but are unavoidable.en
dc.description.sponsorshipThis work was performed at Wetsus, Centre of Excellence for Sustainable Water Technology (www.wetsus.n1). Wetsus is funded by the Dutch Ministry of Economic Affairs, the European Union European Regional Development Fund, the Province of Fryslan, the City of Leeuwarden and by the EZ-KOMPAS Program of the "Samenwerkingsverband Noord-Nederland". The work was funded by Wetsus, the King Abdullah University of Science and Technology (KAUST) and Evides waterbedrijf. The authors like to thank the participants of the Wetsus research theme "Biofouling", KAUST and Evides waterbedrijf for the fruitful discussions and their financial support.en
dc.publisherElsevier BVen
dc.subjectBiodegradable organic substrate loading rateen
dc.subjectBiofilm growthen
dc.subjectDesalinationen
dc.subjectFeed channel pressure dropen
dc.subjectMathematical modelen
dc.subjectPermeate fluxen
dc.titleImpact of organic nutrient load on biomass accumulation, feed channel pressure drop increase and permeate flux decline in membrane systemsen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.identifier.journalWater Researchen
dc.contributor.institutionDepartment of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 67Delft, Netherlandsen
dc.contributor.institutionWetsus, Centre of Excellence for Sustainable Water Technology, Agora 1, P.O. Box 1113Leeuwarden, Netherlandsen
kaust.authorValladares Linares, Rodrigoen
kaust.authorVrouwenvelder, Johannes S.en
kaust.authorBucs, Szilarden
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