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Performance, fouling and cleaning of a thin film composite hollow fiber membrane during fertiliser-drawn forward osmosis process for micro-polluted water
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-5-5 , DOI: 10.1039/d0ew00996b Jinhui Jeanne Huang 1 , Sihao Chen 1 , Yuan Liao 1 , Yunfeng Chen 2 , Xiaofei You 2, 3 , Rong Wang 2, 3
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-5-5 , DOI: 10.1039/d0ew00996b Jinhui Jeanne Huang 1 , Sihao Chen 1 , Yuan Liao 1 , Yunfeng Chen 2 , Xiaofei You 2, 3 , Rong Wang 2, 3
Affiliation
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The fertiliser-drawn forward osmosis (FDFO) process uses fertilizers as draw solutes to extract fresh water from polluted water. The diluted draw solutions after the FDFO process can be directly used for irrigation, which addresses the challenges of irrigation water shortage and eliminates the demand of draw solute recovery. In this work, a thin film composite (TFC) hollow fiber membrane has been developed for the FDFO process. The effects of solutes, feed temperature and foulants (alginate, octanoic acid and gypsum) in the feed solution on its performance were investigated. The membrane showed more severe fouling in the active layer facing draw solution (AL-DS) orientation as more foulants and scalants tended to attach on the porous substrate surface and penetrate into the substrate pores. Hydraulic flushing using DI water, NaOH and HCl solutions was conducted to evaluate the reversibility of the fouled membrane after FDFO operation in the AL-DS orientation. It was found that the 1 M NaOH solution was not effective in removing the alginate fouling layer as alginate tends to penetrate into the membrane pores under alkaline conditions. Octanoic acid-fouled membrane could achieve almost 100% recovery after flushing with 0.1 M NaOH. The octanoic acid can be dissociated into ions under alkaline conditions and thus easily scoured off from the membrane surface. The gypsum-scaled membrane could obtain a 78.2% water flux recovery after 0.2 wt% HCl flushing. Nevertheless, the water flux dropped rapidly in the second run due to the residual crystals on the membrane surface and within the membrane pores.
中文翻译：
肥料复合正渗透过程中微污染水的薄膜复合中空纤维膜的性能，结垢和清洁
化肥抽运的正渗透（FDFO）工艺使用肥料作为抽运溶质，从污水中提取淡水。FDFO处理后的稀释汲取溶液可直接用于灌溉，解决了灌溉用水短缺的挑战，消除了汲取溶质回收的需求。在这项工作中，已经为FDFO工艺开发了薄膜复合材料（TFC）中空纤维膜。研究了进料溶液中溶质，进料温度和污垢（藻酸盐，辛酸和石膏）对其性能的影响。由于更多的污垢和污垢倾向于附着在多孔基材表面上并渗透到基材孔中，因此膜在面对汲取溶液（AL-DS）方向的活性层中显示出更严重的污垢。使用去离子水进行液压冲洗，进行NaOH和HCl溶液以评估FDFO在AL-DS方向上操作后污垢膜的可逆性。发现1M NaOH溶液不能有效去除藻酸盐结垢层，因为藻酸盐倾向于在碱性条件下渗透到膜孔中。用0.1 M NaOH冲洗后，被辛酸污染的膜可以实现几乎100％的回收率。辛酸可以在碱性条件下分解成离子，因此很容易从膜表面上洗去。石膏鳞片在0.2 wt％HCl冲洗后可获得78.2％的水通量回收率。然而，由于膜表面和膜孔内的残留晶体，水流量在第二轮中迅速下降。
更新日期：2021-05-26
中文翻译：
肥料复合正渗透过程中微污染水的薄膜复合中空纤维膜的性能，结垢和清洁
化肥抽运的正渗透（FDFO）工艺使用肥料作为抽运溶质，从污水中提取淡水。FDFO处理后的稀释汲取溶液可直接用于灌溉，解决了灌溉用水短缺的挑战，消除了汲取溶质回收的需求。在这项工作中，已经为FDFO工艺开发了薄膜复合材料（TFC）中空纤维膜。研究了进料溶液中溶质，进料温度和污垢（藻酸盐，辛酸和石膏）对其性能的影响。由于更多的污垢和污垢倾向于附着在多孔基材表面上并渗透到基材孔中，因此膜在面对汲取溶液（AL-DS）方向的活性层中显示出更严重的污垢。使用去离子水进行液压冲洗，进行NaOH和HCl溶液以评估FDFO在AL-DS方向上操作后污垢膜的可逆性。发现1M NaOH溶液不能有效去除藻酸盐结垢层，因为藻酸盐倾向于在碱性条件下渗透到膜孔中。用0.1 M NaOH冲洗后，被辛酸污染的膜可以实现几乎100％的回收率。辛酸可以在碱性条件下分解成离子，因此很容易从膜表面上洗去。石膏鳞片在0.2 wt％HCl冲洗后可获得78.2％的水通量回收率。然而，由于膜表面和膜孔内的残留晶体，水流量在第二轮中迅速下降。
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