Predicting the impact of feed spacer modification on biofouling by hydraulic characterization and biofouling studies in membrane fouling simulators

被引：38
|
作者：
Siddiqui, A. [1 ]
Lehmann, S. [2 ]
Bucs, Sz. S. [1 ]
Fresquet, M. [3 ]
Fel, L. [3 ]
Prest, E. I. E. C. [3 ]
Ogier, J. [2 ]
Schellenberg, C. [2 ]
van Loosdrecht, M. C. M. [3 ]
Kruithof, J. C. [4 ]
Vrouwenvelder, J. S. [1 ,3 ,4 ]
机构：
[1] King Abdullah Univ Sci & Technol KAUST, BESE, Div Biol & Environm Sci & Engn, Water Desalinat & Reuse Ctr WDRC, Thuwal 239556900, Saudi Arabia
[2] LANXESS BU Liquid Purificat Technol, R&D Membranes, D-06803 Bitterfeld, Germany
[3] Delft Univ Technol, Fac Sci Appl, Dept Biotechnol, NL-2629 HZ Delft, Netherlands
[4] European Ctr Excellence Sustainable Water Technol, Wetsus, NL-8911 MA Leeuwarden, Netherlands
来源：
WATER RESEARCH | 2017年 / 110卷
关键词：
Feed spacers; Biofouling; Hydraulic characterization; Seawater desalination; Wastewater reuse; SPIRAL-WOUND MEMBRANES; REVERSE-OSMOSIS MEMBRANES; SYSTEMS; WATER; TECHNOLOGY; FLOW; PERMEATION; PRESSURE; BACTERIA; ADHESION;
D O I：
10.1016/j.watres.2016.12.034
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Feed spacers are an essential part of spiral-wound reverse osmosis (RO) and nanofiltration (NF) membrane modules. Geometric modification of feed spacers is a potential option to reduce the impact of biofouling on the performance of membrane systems. The objective of this study was to evaluate the biofouling potential of two commercially available reference feed spacers and four modified feed spacers. The spacers were compared on hydraulic characterization and in biofouling studies with membrane fouling simulators (MFSs). The virgin feed spacer was characterized hydraulically by their resistance, measured in terms of feed channel pressure drop, performed by operating MFSs at varying feed water flow rates. Short-term (9 days) biofouling studies were carried out with nutrient dosage to the MFS feed water to accelerate the biofouling rate. Long-term (96 days) biofouling studies were done without nutrient dosage to the MFS feed water. Feed channel pressure drop was monitored and accumulation of active biomass was quantified by adenosine tri phosphate (ATP) determination. The six feed spacers were ranked on pressure drop (hydraulic characterization) and on biofouling impact (biofouling studies). Significantly different trends in hydraulic resistance and biofouling impact for the six feed spacers were observed. The same ranking for biofouling impact on the feed spacers was found for the (i) short-term biofouling study with nutrient dosage and the (ii) long-term biofouling study without nutrient dosage. The ranking for hydraulic resistance for six virgin feed spacers differed significantly from the ranking of the biofouling impact, indicating that hydraulic resistance of clean feed spacers does not predict the hydraulic resistance of biofouled feed spacers. Better geometric design of feed spacers can be a suitable approach to minimize impact of biofouling in spiral wound membrane systems. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：281 / 287
页数：7
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