评估利用预处理反冲洗水通过正向渗透稀释反渗透浓缩液的可行性。
Evaluating the Feasibility of Forward Osmosis in Diluting RO Concentrate Using Pretreatment Backwash Water.
作者信息
Liyanaarachchi Susanthi, Jegatheesan Veeriah, Shu Li, Shon Ho Kyong, Muthukumaran Shobha, Li Chun Qing
机构信息
School of Engineering, RMIT University, Melbourne, VIC 3000, Australia.
School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2581, Australia.
出版信息
Membranes (Basel). 2020 Feb 25;10(3):35. doi: 10.3390/membranes10030035.
Forward osmosis (FO) is an excellent membrane process to dilute seawater (SW) reverse osmosis (RO) concentrate for either to increase the water recovery or for safe disposal. However, the low fluxes through FO membranes as well the biofouling/scaling of FO membranes are bottlenecks of this process requiring larger membrane area and membranes with anti-fouling properties. This study evaluates the performance of hollow fibre and flat sheet membranes with respect to flux and biofouling. Ferric hydroxide sludge was used as impaired water mimicking the backwash water of a filter that is generally employed as pretreatment in a SWRO plant and RO concentrate was used as draw solution for the studies. Synthetic salts are also used as draw solutions to compare the flux produced. The study found that cellulose triacetate (CTA) flat sheet FO membrane produced higher flux (3-6 L m h) compared to that produced by polyamide (PA) hollow fibre FO membrane (less than 2.5 L m h) under the same experimental conditions. Therefore, long-term studies conducted on the flat sheet FO membranes showed that fouling due to ferric hydroxide sludge did not allow the water flux to increase more than 3.15 L m h.
正向渗透（FO）是一种出色的膜工艺，可用于稀释海水反渗透（RO）浓缩液，以提高水回收率或进行安全处置。然而，通过FO膜的通量较低以及FO膜的生物污染/结垢是该工艺的瓶颈，这需要更大的膜面积以及具有抗污染性能的膜。本研究评估了中空纤维和平板膜在通量和生物污染方面的性能。氢氧化铁污泥用作模拟受损水，模拟通常在海水反渗透（SWRO）工厂中用作预处理的过滤器的反冲洗水，反渗透浓缩液用作研究的汲取溶液。合成盐也用作汲取溶液以比较产生的通量。研究发现，在相同实验条件下，三醋酸纤维素（CTA）平板FO膜产生的通量（3 - 6 L m⁻² h⁻¹）高于聚酰胺（PA）中空纤维FO膜产生的通量（小于2.5 L m⁻² h⁻¹）。因此，对平板FO膜进行的长期研究表明，氢氧化铁污泥造成的污染使水通量增加不超过3.15 L m⁻² h⁻¹。
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