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Submerged versus side-stream osmotic membrane bioreactors using an outer-selective hollow fiber osmotic membrane for desalination
Desalination ( IF 9.9 ) Pub Date : 2021-06-26 , DOI: 10.1016/j.desal.2021.115196
Van Huy Tran , Sungil Lim , Paula Jungwon Choi , Alicia Kyoungjin An , Dong Suk Han , Sherub Phuntsho , Hokyong Shon

This study investigated the comparative performances, fouling mitigation efficiencies, and operational costs of side-stream and submerged osmotic membrane bioreactors (OMBR) systems using an outer-selective hollow fiber thin-film composite forward osmosis (OSHF TFC FO) membrane. Generally, the submerged OMBR system exhibited the higher fouling mitigation efficiency and a much slower flux decline rate when compared with that of the side-stream system. The side-stream OMBR system demonstrated an initial water flux of 15.8 LMH using 35 g/L NaCl as the draw solution, which was 2-fold higher than that of the submerged system when at its optimal performance. However, salinity accumulation in the reactor of the side-stream system was at a higher rate than for the submerged OMBR system. Both OMBR systems showed comparably high pollutant removal efficiencies over the experimental period. Annual operating costs for the side-stream OMBR system has been estimated to be 38% higher (OPEX) than for the submerged system. Membrane replacement cost accounted for the majority of the OPEX, over 89%, while the energy consumption and cleaning costs only accounted for relatively small portions. Therefore, reducing the membrane replacement cost is critical to realizing the commercial viability of the submerged OMBR system.



中文翻译:

使用外部选择性中空纤维渗透膜进行脱盐的浸没与侧流渗透膜生物反应器

本研究调查了使用外选择性中空纤维薄膜复合正向渗透 (OSHF TFC FO) 膜的侧流和浸没式渗透膜生物反应器 (OMBR) 系统的比较性能、污垢缓解效率和运营成本。通常,与侧流系统相比,浸没式 OMBR 系统表现出更高的污垢缓解效率和更慢的通量下降率。侧流 OMBR 系统在使用 35 g/L NaCl 作为汲取溶液时表现出 15.8 LMH 的初始水通量,比浸入式系统在其最佳性能时高 2 倍。然而,侧流系统反应器中的盐度积累率高于浸没式 OMBR 系统。在实验期间,两种 OMBR 系统都显示出相对较高的污染物去除效率。据估计,侧流 OMBR 系统的年度运营成本 (OPEX) 比水下系统高 38%。膜更换成本占 OPEX 的大部分,超过 89%,而能源消耗和清洁成本仅占相对较小的部分。因此,降低膜更换成本对于实现水下 OMBR 系统的商业可行性至关重要。而能源消耗和清洁成本只占相对较小的部分。因此,降低膜更换成本对于实现水下 OMBR 系统的商业可行性至关重要。而能源消耗和清洁成本只占相对较小的部分。因此,降低膜更换成本对于实现水下 OMBR 系统的商业可行性至关重要。

更新日期:2021-06-28
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