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首页> 外文会议>2011 Membrane technology conference amp; exposition. >Operation Optimization and Membrane Performance of a Hybrid NF Plant
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Operation Optimization and Membrane Performance of a Hybrid NF Plant

机译：混合型NF装置的运行优化和膜性能

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Low fouling nanofiltration membranes are being used at a 10 mgd plant in Pompano Beach,rnFL to meet difficult treatment objectives for a high fouling, colored feedwater. Based onrnextensive pilot testing and process design considerations, the hybrid design NF system wasrnselected and installed at site. In summer 2009, the plant was re-commissioned and wasrnable to meet the required feed pressure and permeate quality targets during the 60 dayrnPerformance Acceptance Test for the 5 trains. The challenging permeate quality targetsrnrequired iron to be reduced below 0.2 ppm and disinfection by-product formation potential tornvery low levels, while keeping calcium between 8-33 mg/l and alkalinity between 20-61 mg/lrnas CaCO_3. This type of partial softening requires an optimized form of NF membrane tornmeet all the requirements.rnThe plant has now been operational for more than one year. There have been somernindications of slow, but steady fouling of the membrane surface. For example, in one trainrnthe trans-membrane pressure rose from 75 psi to 90 psi in about 10 months. During thisrnperiod there was very little change in differential pressure, but salt passage was decreasing.rnEarly in the commissioning process, fouling was minimized by reducing pH and reducing thernantiscalant dosing. Most recently, the plant has used a high pH cleaning, which droppedrnpressure back below 90 psi. Analysis of the foulant suggests the presence of colloidal ironrnand aluminum silicates, as well as organic and phosphate based colloidal material. SEMrnanalysis indicates that the foulant is heavy enough to cover the surface of the membrane,rnbut not plug the spacer material. A detailed analysis of the foulant and cleaningrneffectiveness is reviewed.rnThe plant continues to operate well and meet the City’s water treatment objectives. Furtherrnanalysis is being made of the fouling to better restore membrane performance and preventrnfurther fouling trends.
机译：低污染的纳滤膜正被用于佛罗里达州庞帕诺比奇（Pompano Beach）一家10 mgd的工厂，以满足高污染，有色进水的困难处理目标。基于广泛的中试测试和工艺设计考虑，选择了混合设计NF系统并在现场安装。 2009年夏季，在5列火车进行60天的性能验收测试期间，该工厂进行了重新调试，可满足要求的进料压力和渗透质量目标。极富挑战性的渗透物质量目标要求将铁减少到0.2 ppm以下，并将消毒副产物形成的可能性降低到极低的水平，同时将钙保持在8-33 mg / l之间，而碱度保持在20-61 mg / l之间。CaCO_3。这种类型的部分软化需要优化的NF膜形式才能满足所有要求。该设备现已投入运行超过一年。已有迹象表明膜表面缓慢但稳定地结垢。例如，在一列火车中，跨膜压力在大约10个月内从75 psi上升到90 psi。在此期间，压差变化很小，但盐的通过量却减少了。在调试过程的早期，通过降低pH值和减少防垢剂的用量来减少结垢。最近，该工厂使用了高pH值清洗，将压力降回了90 psi以下。对污垢物的分析表明存在胶体铁和硅酸铝，以及有机和磷酸盐基胶体材料。 SEM分析表明，污垢重到足以覆盖膜的表面，但不会堵塞隔离材料。审查了对污垢和清洁效果的详细分析。rn该工厂继续运转良好，并达到纽约市的水处理目标。正在对结垢进行进一步分析以更好地恢复膜性能并防止进一步结垢的趋势。

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