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Insight into fouling potential analysis of a pilot-scale pressure-assisted forward osmosis plant for diluted seawater reverse osmosis desalination
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2021-04-06 , DOI: 10.1016/j.jiec.2021.03.048
Dong-Ho Kim , Chulmin Lee , Thanh-Tin Nguyen , Rusnang Syamsul Adha , Chaeyeon Kim , Sang-Jun Ahn , Heejong Son , In S. Kim

In recent years, pressure-assisted forward osmosis (PAFO) process has been studied to overcome the low water productivity in FO-RO hybrid seawater desalination. Our research group demonstrated a pilot-scale PAFO-RO plant for seawater desalination operations using secondary treated wastewater and natural seawater. A pretreatment stage of mesh tube filter media (MTF) and cartridge filter (CF) was implemented for a pilot-scale PAFO. In this study, the water quality and fouling index (SDI15 and MFI0.45) of the influent and treated water at each process stage of the plant were measured. For the influent of both wastewater and seawater feature, it showed linear correlations between the concentration of microbial ATP (i.e., an indicator of microbial activity) and MFI0.45. After the PAFO was operated for 76 days, the fouling of the filtration media and the FO membrane was also analyzed. The observation of the fouled membranes by SEM showed that fouling was hardly observed on the side contacting with seawater, but severe bacterial biofilms were observed on the side contacting with wastewater. FT-IR results also confirmed protein-like substances on the membrane surface contacting with wastewater, indicating irreversible fouling. This study suggests that an advanced pretreatment process to remove bacteria and organic matter is essential for the protection of the FO membranes.



中文翻译:

对用于稀释海水反渗透淡化的中试压力辅助正向渗透装置的结垢潜力分析的见解

近年来,为了克服FO-RO混合海水淡化中的低水生产率,已经研究了压力辅助正渗透(PAFO)工艺。我们的研究小组演示了使用二次处理的废水和天然海水进行海水淡化操作的PAFO-RO中试规模工厂。对中试规模的PAFO实施了网管过滤介质(MTF)和筒式过滤器(CF)的预处理阶段。在这项研究中,测量了工厂每个过程阶段进水和处理后的水的水质和结垢指数(SDI 15和MFI 0.45)。对于废水和海水特征的进水,它显示了微生物ATP浓度(即微生物活性的指标)与MFI 0.45之间的线性关系。。PAFO运行76天后,还分析了过滤介质和FO膜的结垢情况。通过SEM观察污染膜,发现与海水接触的一侧几乎没有污染,但与废水接触的一侧观察到严重的细菌生物膜。FT-IR结果也证实了膜表面上的蛋白样物质与废水接触,表明了不可逆的结垢。这项研究表明,去除细菌和有机物的先进预处理工艺对于保护FO膜至关重要。

更新日期:2021-04-26
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