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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Ultrafiltration membrane pre-treatment benefits for reverse osmosis process in seawater desalting.Quantification in terms of capital investment cost and operating cost reduction
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Ultrafiltration membrane pre-treatment benefits for reverse osmosis process in seawater desalting.Quantification in terms of capital investment cost and operating cost reduction

机译：超滤膜预处理有利于海水淡化中的反渗透过程。在资本投资成本和运营成本降低方面进行量化

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The need for appropriate pre-treatment to ensure optimum performance of reverse osmosis (RO) systems is well understood.RO manufacturers recommend that the SDI should be lower than 3.An increase of SDI involves rapid fouling of the RO membranes,which then increases the maintenance time duration.Conventional pre-treatment is not 100% secure to achieve this recommendation.Membrane filtration and especially ultrafiltration (UF),starts to be recognised as the best pre-treatment before RO.References of the membranes manufacturers are growing up but the knowledge of the real benefits of membrane processes compared to conventional ones in terms of both capital investment cost and operating cost reduction is still missing.In this paper,studies on a pilot unit coupling two different pre-treatments and a standard RO membrane element have been carried out on a real influent of the Mediterranean Sea at Palavas les Flots (France).SDI of the raw seawater was comprised between 6.1 and 6.4.Two pre-treatments have been compared,a conventional sand filter and a UF membrane with a proprietary unique design from Polymem [1,2].The filtration modules are constituted with polysulfone hollow fibers working in a dead-end outside-in filtration mode with periodic backwashing.Molecular weight cut off was 100 kDa.Long-term experiments have shown that the SDI after the UF modules was 1.2-2 while it was 5.8-5.9 with the sand filter.Decreasing of 28% of the RO permeability was measured in 30 days with sand filter pre-treatment.Frequency of RO chemical cleaning was then estimated between 12 and 18 days.On the same seawater,with UF pre-treatment RO permeability decreasing was 0% during 20 days operating which would involve no chemical cleaning demand.Capital investment cost and operating cost benefits of UF have been estimated.It appears that these costs are comparable to those encountered in drinking water production by membranes.
机译：众所周知，需要适当的预处理以确保反渗透（RO）系统的最佳性能.RO制造商建议将SDI降低至3以下.SDI的增加会导致RO膜快速结垢，从而增加RO膜的结垢率。维持时间长短。常规预处理不能100％安全地达到此建议。膜过滤，尤其是超滤（UF）开始被认为是RO之前的最佳预处理。关于膜工艺与传统方法相比在资本投资成本和降低运营成本方面的实际好处的知识仍然缺乏。在本文中，关于结合两种不同预处理和标准RO膜元件的中试装置的研究已经开展。在帕拉瓦斯莱弗洛茨（法国）的地中海实际进水口上进行的，原始海水的SDI介于6.1和6.4之间。比较了传统的砂滤器和Polymem [1,2]专有设计的超滤膜的过滤性能。过滤模块由聚砜中空纤维构成，该纤维以无端外-外过滤模式工作，并定期进行反冲洗。截留分子量为100 kDa。长期实验表明，超滤组件后的SDI为1.2-2，而用沙滤器为5.8-5.9。在30天内测量到的RO渗透率降低了28％然后在12至18天之间估算RO化学清洗的频率。在相同的海水中，用UF预处理在运行20天期间RO渗透率降低0％，这将不需要化学清洗需求。已经估算了超滤的成本和运营成本收益。看来这些成本与膜式饮用水生产中遇到的成本相当。

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