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首页> 外文会议>Membrane technology conference exposition >Nanofiltration in Mery-sur-Oise drinking water treatment plant: lessons learnt after 10 years of operation
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Nanofiltration in Mery-sur-Oise drinking water treatment plant: lessons learnt after 10 years of operation

机译：Mery-Sur-Oise饮用水处理厂的纳滤网：经过10年的运营后汲取的经验教训

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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. The 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. Pre-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. During 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). Hydraulic performances were more sustained than initially expected. After 10 years Kw (water permeability at 25°C 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. Thus 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. In 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：Mery-sur-Oise饮用水处理厂（DWTP），位于巴黎郊区（法国），由威尼娅水经营代表Sedif（Syndicat des Eaux d'Iie de France），通过两个平行过程来处理地面水路径，传统的生物路径和纳米滤波（NF）路径。 NF路径（全球能力：37 MGD）于1999年实施，在水中混合后，将设施全球能力增加到90 MGD。其目的还通过降低其硬度，其天然有机物质浓度及其微渗透剂量来提高水质。这个大型NF单位的启动是当时的真正挑战，现在有可能，经过10年的运营（总水产0.4亿m〜3！），提供反馈。 NF单元由8个相同的列车组成，每个列车包括3个连续阶段，并包含9120 8英寸NF200B（Dow Chemical Company）螺旋缠绕元件。 NF200B专门开发用于抑制杀虫剂和溶解的有机碳（DOC），但允许钙部分通过部分。膜最初是设计为5年的预期寿命，但随着他们的表演稳定，它们在运作10年后被更新。 NF植物的寿命和效率是由于过程设计，由于优化的预处理和适当的膜清洁（CIP）系统而控制污垢。预处理是由储水，6.9，Actiflo的pH调节组成？加权浮动层状沉降，臭氧化，内联凝血剂注射，双层过滤（无烟煤/砂），抗央气加入和绝对6μm预过滤。 CIP每6周定期进行一次，并在碱性/洗涤剂期浸泡和再循环中，然后是柠檬酸溶液。在经营的10年内，膜保持其选择性，使水质量目标完全实现：TOC降低高达95％，微胶剂去除（NF渗透物​​中没有发现的农药在30次）和钙减少（止回数）根据温度）。液压性能比最初预期更持续。 30年后KW（从渗透压校正的25℃下的水渗透率）只能降低25％，从6到4.5升/（Hm〜2.bar），而Δp_（fc）（纵向压降进料侧和浓缩侧分别呈现相对中等的增加140％，60％和180％，分别为1,2和3.因此，对控制污垢进行的预防性（预处理）和矫正（CIP）行动能够维持膜抑制和液压性能，使操作员能够将膜寿命从5到10年延伸，无需运行和维护额外成本扩展。 2008年和2009年的膜被培训后被更换火车，同时保持水产。该行动取得了成功，自2009年8月以来，NF单位现已与新膜合作。

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