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首页> 外文会议>2011 Membrane technology conference amp; exposition. >HIGH RATE CLARIFICATION WITH PLATES FOR MEMBRANE PRETREATMENT
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HIGH RATE CLARIFICATION WITH PLATES FOR MEMBRANE PRETREATMENT

机译：膜板的高速率澄清，用于膜的预处理

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The Fort Bend Subsidence District (FBSD) adopted a regulatory plan in 2003 to establish a policy for groundwater use regulation to control subsidence on a regional basis. Per the FBSD 2003 regulatory plan, the City of Sugar Land (City) must reduce and maintain its groundwater use by 30 percent in 2013 and 60 percent in 2025. To meet the required 30 percent conversion by 2013, the City plans to construct a 9 mgd surface water treatment plant, which will be expanded to an ultimate capacity of 22 mgd.rnThe Brazos River water delivered through Oyster Creek will be the source water for Sugar Land's SWTP. The City evaluated several treatment process alternatives and selected to build a membrane treatment plant with high-rate clarification for pretreatment and granular activated carbon (GAC) for taste and odor (T&O) control.rnA 30-day pilot testing was conducted using a high rate clarifier with plate settlers at a planemetric surface overflow rate (SOR) of 2.5 gpm/sf converting to a projected plate SOR of 0.33 gpm/sf and was able to produce settled water turbidity less than 2 NTU 95% of the time, meeting the State requirement of obtaining 2-log virus removal credits from the pretreatment process. Pilot testing was conducted with pre-oxidant chlorine dioxide dosed at 0.4 mg/L and coagulant polyaluminum chloride (PAC1) dosed at 40-100 mg/L. PAC1 was able to achieve 40-50% TOC removal.rnThe application of the high rate clarification with plates as low pressure membrane pretreatment was successfully and produces good settled water quality to the membrane system for the Sugar land SWTP. The implementation of the high-rate plate clarifiers in the plant design reduces plant site footprint.
机译：本德堡沉降区（FBSD）在2003年通过了一项监管计划，以制定一项地下水使用监管政策，以控制区域沉降。根据FBSD 2003监管计划，Sugar Land（城市）必须在2013年减少和维持其地下水使用量，并在2025年减少60％。要在2013年之前达到要求的30％转换，纽约市计划建造9 mgd地表水处理厂，将扩大至22 mgd.n的最终产能。通过Oyster Creek输送的Brazos河水将成为Sugar Land SWTP的原水。纽约市评估了几种处理方法的替代方案，并选择建造具有高澄清度的膜处理厂进行预处理，并使用颗粒活性炭（GAC）进行味道和气味（T＆O）控制。rn高速率进行了30天的中试测试带有平板沉降器的澄清器，其平面溢流率（SOR）为2.5 gpm / sf，转换为投影平板的SOR为0.33 gpm / sf，并且能够在95％的时间内产生低于2 NTU的沉降水浊度，达到国家规定从预处理过程中获得2-log病毒清除信用的要求。用0.4 mg / L的预氧化剂二氧化氯和40-100 mg / L的凝结剂聚氯化铝（PAC1）进行了中试。 PAC1能够实现40-50％的TOC去除率。rn成功地将板进行高速率澄清作为低压膜预处理的应用，并为Sugar Land SWTP的膜系统产生了良好的沉降水质量。在工厂设计中实施高速率平板澄清池可减少工厂占地面积。

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