Impact of organic nutrient load on biomass accumulation, feed channel pressure drop increase and permeate flux decline in membrane systems
Valladares Linares, Rodrigo
van Loosdrecht, Mark C.M.
Kruithof, Joop C.
Vrouwenvelder, Johannes S.
KAUST DepartmentWater Desalination and Reuse Research Center (WDRC)
Environmental Science and Engineering Program
Permanent link to this recordhttp://hdl.handle.net/10754/563883
MetadataShow full item record
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.
SponsorsThis 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.
- Impact of biofilm accumulation on transmembrane and feed channel pressure drop: effects of crossflow velocity, feed spacer and biodegradable nutrient.
- Authors: Dreszer C, Flemming HC, Zwijnenburg A, Kruithof JC, Vrouwenvelder JS
- Issue date: 2014 Mar 1
- Development and characterization of 3D-printed feed spacers for spiral wound membrane systems.
- Authors: Siddiqui A, Farhat N, Bucs SS, Linares RV, Picioreanu C, Kruithof JC, van Loosdrecht MC, Kidwell J, Vrouwenvelder JS
- Issue date: 2016 Mar 15
- Pressure drop increase by biofilm accumulation in spiral wound RO and NF membrane systems: role of substrate concentration, flow velocity, substrate load and flow direction.
- Authors: Vrouwenvelder JS, Hinrichs C, Van der Meer WG, Van Loosdrecht MC, Kruithof JC
- Issue date: 2009
- In-situ biofilm characterization in membrane systems using Optical Coherence Tomography: formation, structure, detachment and impact of flux change.
- Authors: Dreszer C, Wexler AD, Drusová S, Overdijk T, Zwijnenburg A, Flemming HC, Kruithof JC, Vrouwenvelder JS
- Issue date: 2014 Dec 15
- Biofouling of spiral-wound nanofiltration and reverse osmosis membranes: a feed spacer problem.
- Authors: Vrouwenvelder JS, Graf von der Schulenburg DA, Kruithof JC, Johns ML, van Loosdrecht MC
- Issue date: 2009 Feb