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首页> 外文会议>2011 Membrane technology conference amp; exposition. >Description of an on-line fouling characterization tool for the Méry-sur-Oise nanofiltration plant
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Description of an on-line fouling characterization tool for the Méry-sur-Oise nanofiltration plant

机译：瓦兹河畔梅里纳滤装置的在线结垢表征工具描述

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The Méry-sur-Oise drinking water treatment plant (France), operated by Veolia Water on thernbehalf of the Syndicat des Eaux d’Ile de France (SEDIF), has been using a 37 MG/dayrnnanofiltration (NF) membranes plant to produce safe drinking water since 1999. The pretreatmentrnis composed of water storage, acid injection, Actiflo~? weighted flocs lamellarrnsettlement, ozonation, dual layer filtration (anthracite/sand), antiscalant addition andrnmicrofiltration.rnA serious and major problem in nanofiltration process is membrane fouling, resulting in anrnincrease of the normalized pressure drop and normalized flux reduction which causernsignificant increase of operational costs and cleaning chemicals consumption increasing therndrinking water production costs. Fouling is only diagnosed on the basis of parameters such asrnpressure drop, flux decrease, salt rejection decrease and destructive membrane autopsies.rnEvidently, there is a need for advanced tools allowing prediction and control of membranernfouling and optimization of chemical cleaning at real time without any interruption of thernoperation and for a minimal cost.rnThe objective of this study was to develop and validate a new tool for on-line foulingrnprediction and control which must be representative of spiral wound membrane elements usedrnin practice.rnFor our study, three identical pilot units containing each 8 parallel 2.5-inch spiral wound NFrnelement are connected on each of the three stages of a NF train respectively. Consequently,rnthe pilot units and the train were fed with the same water quality and operated with similarrnhydraulic conditions. Chemical cleanings were conducted simultaneously on the train and thernpilot units periodically every 1000 hours. Pressure transmitters were used for pressure droprnmonitoring of the three stages of the NF train and differential pressure transmitters were usedrnfor the individual membrane elements on each pilot unit.rnAfter 215 days of operation, the resulting fouling was extensively characterized by completernmembrane autopsies before and after chemical cleaning.rnThis new tool allows the substitution of the 8 inch-elements autopsies by 2.5-inch elementsrnautopsies and the optimisation of the cleaning efficiency. It does not need to interrupt thernplant operation. Moreover, this tool can be used as a monitoring tool for early warning,rncharacterization of the fouling potential of the feed water, comparison of different pretreatmentrnschemes and for evaluation of fouling control applying different chemicals.
机译：威立雅水务在法国水大集团（SEDIF）的代表下运营的由瓦利瓦水公司运营的瓦伊河畔梅里饮用水处理厂已经使用了37毫克/天的纳滤（NF）膜装置来生产安全的自1999年起开始使用饮用水。预处理器由储水，酸注入，Actiflo®组成。絮凝絮凝薄片，臭氧化，双层过滤（无烟煤/砂），防垢剂添加和微滤清洁化学品的消耗增加了饮用水的生产成本。仅基于压降，通量减少，盐分减少和破坏性膜的尸体解剖等参数来诊断结垢。显然，需要先进的工具来实时预测和控制膜结垢并优化化学清洗，而不会中断本研究的目的是开发和验证一种新的在线污垢预测和控制工具，该工具必须能够代表实际中使用的螺旋缠绕膜元件。对于我们的研究，三个相同的中试装置各包含一个8个平行的2.5英寸螺旋缠绕NF元件分别连接在NF列的三个阶段的每一个上。因此，给飞行员和火车提供了相同的水质，并在类似的液压条件下运行。每1000个小时定期在火车和飞行员站上同时进行化学清洗。使用压力变送器对NF链的三个阶段进行压力监测，并使用压差变送器对每个中试单元上的各个膜元件进行测量。在运行215天后，通过化学清洗前后的完整尸体尸检对结垢进行了广泛表征.rn这种新工具可以将2.5英寸的元素尸体解剖替换为8英寸的元素尸体解剖，并且可以优化清洁效率。无需中断植株操作。此外，该工具还可以用作监测工具，以进行预警，表征给水的结垢潜力，比较不同的预处理方案以及评估使用不同化学品的结垢控制。

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