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Nanofiltration in Mery-sur-Oise drinking water treatment plant: lessons learnt after 10 years of operation

机译：瓦伊河畔瓦里饮用水处理厂的纳滤：运行10年后的经验教训

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摘要

Mery-sur-Oise drinking water treatment plant (DWTP), located in the suburbs of Paris (France) and operated by Veolia Water on behalf of the SEDIF (Syndicat des Eaux d'IIe de France), treats surface water through two parallel process paths, a conventional biological path and a nanofiltration (NF) path. The NF path (global capacity: 37 MGD) was implemented in 1999, increasing the facility global capacity to 90 MGD, after the mixing of waters. Its purpose also was to improve the water quality by lowering its hardness, its natural organic matter concentration and its micropollutants amount. The start-up of this large NF unit was a real challenge at that time, and it is now possible, after 10 years of operation (total water production of 0.4 billion m~3!), to present a feedback.rnThe NF unit is composed of 8 identical trains, each including 3 successive stages, and contains 9120 8-inch NF200B (Dow Chemical Company) spiral-wound elements. NF200B was specifically developed to reject pesticides and Dissolved Organic Carbon (DOC) but allow calcium to pass partially. Membranes were initially designed for a 5 year life expectancy but, as their performances were stable, they were renewed after 10 years of operation. The longevity and efficiency of the NF plant is due to the process design, able to control fouling thanks to an optimized pre-treatment and an adequate membrane Cleaning In Place (CIP) system.rnPre-treatment is composed of water storage, pH regulation at 6.9, Actiflo? weighted floes lamellar settlement, ozonation, inline coagulant injection, dual layer filtration (anthracite/sand), antiscalant addition and absolute 6 μm pre-filtration. CIP are conducted periodically every 6 weeks and consist in the soaking and recirculation of a basic/detergent phase followed by a citric acid solution.rnDuring the 10 years of operation, membranes kept their selectivity so water quality objectives were fully achieved: TOC reduction up to 95%, micropollutants removal (no pesticide ever found in NF permeate among 30 searched) and calcium reduction (rejection between 20 and 55 % according to the temperature).rnHydraulic performances were more sustained than initially expected. After 10 years Kw (water permeability at 25℃ corrected from the osmotic pressure) had only decreased by 25 %, from 6 to 4.5 L/(h.m~2.bar), while ?P_(fc) (longitudinal pressure drop between the feed side and the concentrate side) presented relatively moderate increases by 140%, 60% and 180% respectively for stages 1, 2 and 3.rnThus preventive (pre-treatment) and corrective (CIP) actions carried out to control fouling were able to sustain membrane rejections and hydraulic performances, which allowed the operator to extend the membrane life from 5 to 10 years without operation and maintenance extra costs expand.rnIn 2008 and 2009 membranes were replaced train after train while maintaining the water production. The operation was a success and the NF unit has now been working with new membranes since August 2009.
机译：瓦伊河畔穆里饮用水处理厂（DWTP）位于法国巴黎郊区，由威立雅水务代表SEDIF（法国合成工场）运营，它通过两个并行过程处理地表水路径，常规生物路径和纳滤（NF）路径。 NF路径（全球容量：37 MGD）于1999年实施，在水混合后，设施的全球容量增加到90 MGD。其目的还在于通过降低硬度，天然有机物浓度和微量污染物的量来改善水质。当时，这套大型NF装置的启动是一个真正的挑战，现在经过10年的运行（总产水量为4亿立方米〜3！），现在有可能提出反馈意见。由8个相同的列组成，每个列包括3个连续的阶段，并包含9120个8英寸NF200B（Dow Chemical Company）螺旋缠绕元件。 NF200B是专门为拒绝农药和可溶性有机碳（DOC）而设计的，但允许钙部分通过。最初设计的膜的预期寿命为5年，但由于性能稳定，因此在运行10年后会对其进行更新。 NF工厂的长寿和效率归功于工艺设计，得益于优化的预处理和适当的膜原位清洗（CIP）系统，它能够控制结垢。rn预处理包括储水，pH调节6.9，Actiflo？称重絮凝物层状沉降，臭氧化，在线凝结剂注入，双层过滤（无烟煤/砂），添加防垢剂和绝对6μm预过滤。 CIP每6周定期进行一次，其过程是将碱/洗涤剂相浸泡并再循环，然后再注入柠檬酸溶液。在运行的10年中，膜保持了选择性，因此水质目标得以完全实现：将TOC降低至95％的微量污染物去除（在30个被搜索的NF渗透物​​中未发现任何农药）和钙减少（根据温度的不同介于20％和55％之间）。液压性能比最初预期的要持久。 10年后，Kw（根据渗透压校正的25℃的水渗透率）从6降低到4.5 L /（hm〜2.bar），而ΔP_（fc）（两次进料之间的纵向压降）仅降低了25％。阶段和浓缩阶段）分别在第1、2和3阶段相对温和地增加了140％，60％和180％。因此，为控制结垢而采取的预防（预处理）和纠正（CIP）措施能够维持膜的剔除和水力性能，使操作员可以将膜的寿命从5年延长到10年，而无需进行操作和维护，从而增加了额外的成本。在2008年和2009年，在保持水生产的同时，逐列更换膜。该操作非常成功，NF单元自2009年8月以来一直在使用新的膜。

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  • 来源
    《》|2011年|p.1-13|共13页
  • 会议地点 Long BeachCA(US);Long BeachCA(US)
  • 作者

    C. Marconnet; M. Djafer; L. Fournier; X. Metteil; V. Heim; G. Chagneau;

  • 作者单位

    Veolia Water, 6, Esplanade Charles de Gaulle, 92751 Nanterre cedex, France;

    Veolia Water, 6, Esplanade Charles de Gaulle, 92751 Nanterre cedex, France;

    Veolia Water, 6, Esplanade Charles de Gaulle, 92751 Nanterre cedex, France;

    Veolia Water, 6, Esplanade Charles de Gaulle, 92751 Nanterre cedex, France;

    Syndicat des Eaux d'Ue de France, 14, rue Saint Benoit, 75006 Paris, France;

    Syndicat des Eaux d'Ue de France, 14, rue Saint Benoit, 75006 Paris, France;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 净水工程（给水处理）;净水工程（给水处理）;薄膜技术;
  • 关键词

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