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Pretreatment options for municipal wastewater reuse using membrane technology

机译:使用膜技术的市政废水回用的预处理选项

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摘要

Increasing freshwater scarcity across the world means that wastewaterreclamation is being considered as a key method in which to meet the growingdemand. Evolution of water reuse schemes where high quality product isrequired such as for indirect potable reuse has led to the adoption in recentyears of the integrated membrane scheme using a combination of microfiltrationor ultrafiltration with reverse osmosis membrane. However, despitetechnological advancements, these membranes are still prone to foulingresulting in increased costs through cleaning or replacement. This thesis aimsto look at pretreatment to reduce the fouling propensity of the microfiltrationmembranes via a 600m3 /d pilot plant which was commissioned to investigateindirect potable reuse.A range of pretreatments including pre-screening, pre-coagulation, powderedactivated carbon and granular activated carbon were assessed based on foulingamelioration, water quality improvement and cost analysis. Results showed thatferric sulphate dosing was the most effective in terms of reducing the reversiblefouling rate especially at high turbidity loads enabling higher flux to be realisedleading to a small cost benefit. Activated carbon proved the most effectivepretreatment in terms of organic removal and a significant reduction in theirreversible fouling rate. However, the cost involved in using this as apretreatment is significant compared to possible cost savings through reducedrequirement for chemical cleaning. This pretreatment is only viable if it obviatesthe need for a separate organic removal process.
机译:全球范围内淡水短缺的加剧意味着,废水回收被视为满足日益增长的需求的关键方法。近年来,需要间接使用的高质量产品的水回用方案的发展,导致了采用微滤或超滤与反渗透膜相结合的综合膜方案。然而,尽管技术进步,这些膜仍易于结垢,导致通过清洁或更换而增加了成本。本文旨在通过600m3 / d的中试工厂研究减少微滤膜结垢倾向的预处理方法,该中试设备被委托研究间接饮用水的可重复使用性。评估了一系列预处理方法,包括预筛选,预凝结,粉状活性炭和颗粒状活性炭。基于污垢改善,水质改善和成本分析。结果表明,就降低可逆结垢率而言,硫酸铁计量是最有效的,特别是在高浊度负载下,可以实现更高的通量,从而带来较小的成本收益。就去除有机物和显着降低其可逆结垢率而言,活性炭被证明是最有效的预处理方法。但是,与通过减少化学清洁的要求而可能节省的成本相比,将其用作预处理所涉及的成本非常可观。这种预处理只有在不需要单独的有机去除工艺的情况下才可行。

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    Hatt Juliette W.;

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  • 年度 2012
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  • 正文语种 en
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