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I.; Prest, E.I.; Bucs, Szilard; van Loosdrecht, M.C.M.; Kruithof, J.C.; Vrouwenvelder, Johannes S. Citation Siddiqui A, Pinel I, Prest EI, Bucs SS, van Loosdrecht MCM, et al. (2017) Application of DBNPA dosage for biofouling control in spiral wound membrane systems. DESALINATION AND WATER TREATMENT 68: 12-22. Available: http://dx.a b s t r a c tBiocides may be used to control biofouling in spiral-wound reverse osmosis (RO) and nanofiltration (NF) systems. The objective of this study was to investigate the effect of biocide 2,2-dibromo-3-nitrilopropionamide (DBNPA) dosage on biofouling control. Preventive biofouling control was studied applying a continuous dosage of substrate (0.5 mg/L) and DBNPA (1 mg/L). Curative biofouling control was studied on pre-grown biofilms, once again applying a continuous dosage of substrate (0.5 mg acetate C/L) and DBNPA (1 and 20 mg/L). Biofouling studies were performed in membrane fouling simulators (MFSs) supplied with biodegradable substrate and DBNPA. The pressure drop was monitored in time and at the end of the study, the accumulated biomass in MFS was quantified by adenosine triphosphate (ATP) and total organic carbon (TOC) analysis. Continuous dosage of DBNPA (1 mg/L) prevented pressure drop increase and biofilm accumulation in the MFSs during a run time of 7 d, showing that biofouling can be managed by preventive DBNPA dosage. For biofouled systems, continuous dosage of DBNPA (1 and 20 mg/L) inactivated the accumulated biomass but did not restore the original pressure drop and did not remove the accumulated inactive cells and extracellular polymeric substances (EPS), indicating DBNPA dosage is not suitable for curative biofouling control.

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Please cite this article as: Farhat, N.M., Staal, M., Siddiqui, A., Borisov, S.M., Bucs, S.S., Vrouwenvelder, J.S., Early non-destructive biofouling detection and spatial distribution: Application of oxygen sensing optodes, Water Research (2015), doi: 10.1016/j.watres.2015.06.015. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 51Results show that at an early stage, biofouling development 52 was detected by the oxygen sensing optodes while no 53 significant increase in pressure drop was yet observed.