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首页> 外文会议>2011 Membrane technology conference amp; exposition. >SURFACE WATER DUAL-MEMBRANE TREATMENT PLANT - DESIGN INNOVATIONS AND 7-YEARS OF OPERATION
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SURFACE WATER DUAL-MEMBRANE TREATMENT PLANT - DESIGN INNOVATIONS AND 7-YEARS OF OPERATION

机译：地表水双膜处理厂-设计创新和运营7年

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In the late 1990's west Texas was experiencing a serious drought affecting water supplies. The City of Abilene was being served by two, 24 mgd surface water treatment plants but the City needed a new reliable water supply source to serve its growing population. It was decided that the best option would be to develop a new water supply that would preserve the City's limited local fresh water supplies. The new source water would be from O.H. Ivie Reservoir (Lake Ivie), which is located approximately 50 miles from the City (Figure 1). Lake Ivie is formed by the S.W. Freese Dam near the confluence of the Colorado and Concho Rivers and the intake would be on the Colorado River entry leg to the lake. The lake contains moderately brackish water (approximately 1,200 mg/L total dissolved solids, TDS) and requires partial demineralization.rnA feasibility study prepared by CH2M HILL in 2000 identified the preferred processes for the new water treatment plant ~ dual membrane treatment which could treat brackish surface water and produce high quality finished water to meet existing and anticipated drinking water regulations. Microfiltration (MF) or ultrafiltration (UF) would filter all of the plant feed water and reverse osmosis (RO) would desalt a portion of the MF/UF filtrate (i.e. split-treatment). The percentage of filtrate desalted by RO is dependent upon the blended finished water quality (TDS) goal and RO system recovery (because the installed capacity of the MF/UF system is fixed). The plant (WTP), originally called the Southside WTP and later named the Hargesheimer Water Plant, has an initial capacity of 7.5 million gallons per day (mgd), including 3 mgd RO permeate capacity (Figure 2). The design ultimate capacity of the facility is 24 mgd.rnMF/UF and RO pilot testing was performed from December 2000 through April 2001 to determine allowable MF/UF products allowed to be bid and process design criteria for M/UF and RO membranes. After a competitive bidding process, Pall Microza MF was selected. The treatment plant was constructed and, when commissioned in September 2003, was the first large-scale municipal dual-membrane surface water treatment plant in North America. The plant has now has been in successful operation more than seven years.rnThis paper summarizes the membrane system design criteria and performance during the seven year operating period since commissioning. An innovative design feature is described where a typically used "break tank" located between MF and RO systems was not used. About four years after commissioning, some of the stainless steel piping on the MF system developed pin-hole leaks at some of the header piping welds. Possible causes for the pin-holes forming are described herein. Because the facility is an inland desalting plant, RO concentrate disposal is a very significant issue. The paper discusses management and disposal of the saline concentrate. Evaporation ponds and use of innovative enhanced evaporation equipment reduce the volume of concentrate to be disposed.
机译：在1990年代后期，德克萨斯州西部经历了严重的干旱，影响了供水。阿比林市有两家24毫克/吨的地表水处理厂，但该市需要一个新的可靠的水源来服务其不断增长的人口。决定最好的选择是开发新的供水系统，以保留纽约市有限的当地淡水供应。新的水源将来自O.H.伊维水库（伊维湖），距城市约50英里（图1）。伊维湖（Lake Ivie）由S.W.释放大坝，靠近科罗拉多河和康乔河的汇合处，取水口将在科罗拉多河到湖的入口处。湖中含有微咸水（约1200 mg / L的总溶解固体，TDS），需要部分脱盐。rnCH2M HILL在2000年进行的可行性研究确定了新的水处理厂〜可处理咸水的双膜处理的优选工艺。地表水并生产高质量的成品水，以满足现有和预期的饮用水法规。微滤（MF）或超滤（UF）将过滤掉所有的植物给水，反渗透（RO）将使MF / UF滤液的一部分脱盐（即分处理）。 RO脱盐的滤液百分比取决于混合的最终水质（TDS）目标和RO系统回收率（因为MF / UF系统的安装容量是固定的）。该工厂（WTP）最初称为Southside WTP，后来更名为Hargesheimer水厂，其初始产能为每天750万加仑（mgd），其中包括3 mgd的RO渗透能力（图2）。该设施的设计极限容量为24 mgd.rnMF / UF，从2000年12月至2001年4月进行了RO试点试验，以确定允许作为MF / UF和RO膜招标和工艺设计标准的MF / UF产品。经过竞争性的投标过程，Pall Microza MF被选中。该污水处理厂建成后，于2003年9月投入使用，是北美首家大型市政双膜地表水处理厂。该工厂现已成功运行超过七年。rn本文总结了自调试以来的七年运行期间膜系统的设计标准和性能。描述了一种创新的设计功能，其中未使用位于MF和RO系统之间的常用“破碎罐”。调试大约四年后，MF系统上的一些不锈钢管道在某些总管管道焊缝处出现针孔泄漏。本文描述了形成针孔的可能原因。由于该设施是内陆脱盐厂，因此RO精矿的处置是一个非常重要的问题。本文讨论了盐水浓缩物的管理和处置。蒸发池和创新的增强蒸发设备的使用减少了要处理的浓缩液的体积。

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