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首页> 外文期刊>Desalination and water treatment >Fouling reduction by formation of iron oxide cake layer on the pretreatment membrane in an SWRO plant
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Fouling reduction by formation of iron oxide cake layer on the pretreatment membrane in an SWRO plant

机译：通过在SWRO设备中的预处理膜上形成氧化铁饼层来减少结垢

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There has been a recent increase in the interest for desalination technologies, and this has also brought attention to the importance of pretreatment processes. Applying the appropriate pretreatment processes makes it possible to improve the efficiency of reverse osmosis, as the primary treatment, as well to improve the output of the entire desalination process. Although pretreatment methods using microfiltration and ultrafiltration, which are able to produce a permeate with stable qualities, have been actively considered, fouling inevitably occurs in these membranes, so it is important to actively investigate methods to reduce fouling. In this study, iron oxide was used to apply a pretreatment process in order to reduce membrane fouling in a seawater reverse osmosis plant since iron oxide has a high removal efficiency for dissolved organic carbons in seawater which has a high ionic strength. Powdered iron oxide was used to form a cake layer on the surface of the dynamic membrane in order to improve the membrane performance, and as a result, an additional, temporary intensive process will not be necessary when there is an algal bloom. This study investigated whether the dynamic membrane filtration system could operate in a stable manner without additional injection by forming a cake layer with iron oxide on the surface of the membrane at the beginning of the operation. The results indicate that stable operation was in fact achieved, even when the backwashing flow rate was applied at 0.67 Q compared with filtration flow rate (Q) without aeration. This is because the membrane fouling loading was reduced by the presence of the iron oxide, and the membrane performance improved as a result. This method is thus expected to increase the recovery rate of the pretreatment processes and to reduce maintenance costs.
机译：最近对脱盐技术的兴趣增加了，这也引起了人们对预处理工艺的重要性的关注。采用适当的预处理工艺可以提高作为主要处理工艺的反渗透效率，并提高整个淡化工艺的产量。尽管已经积极地考虑了使用微滤和超滤的预处理方法，这些方法能够产生质量稳定的渗透液，但是不可避免地会在这些膜上发生结垢，因此，积极研究减少结垢的方法很重要。在这项研究中，氧化铁用于预处理工艺以减少海水反渗透工厂中的膜污染，因为氧化铁对具有高离子强度的海水中溶解的有机碳具有很高的去除效率。为了改善膜的性能，使用了氧化铁粉在动态膜的表面上形成滤饼层，因此，当藻类大量开花时，不需要额外的临时强化过程。这项研究调查了动态膜过滤系统是否可以通过在操作开始时在膜表面上形成具有氧化铁的滤饼层而无需额外注入就能稳定运行。结果表明，即使以0.67 Q施加反洗流量（相比于不通气的过滤流量（Q）），实际上也可以实现稳定的运行。这是因为通过氧化铁的存在降低了膜结垢负荷，结果膜性能提高。因此，期望该方法增加预处理过程的回收率并降低维护成本。

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