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首页> 外文会议>Membrane technology 2008 >Design and First-Year Operation of the 50 mgd Membrane TreatmentFacility at Gwinnett County, Georgia
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Design and First-Year Operation of the 50 mgd Membrane TreatmentFacility at Gwinnett County, Georgia

机译：乔治亚州格温内特县50 mgd膜处理设施的设计和第一年运营

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Gwinnett County, located near Atlanta, Georgia, is one of the fastest growing counties in thernnation. A new 20 mgd state-of-the-art water reclamation and processing facility, called the F.rnWayne Hill Water Resources Center, became operational in December 2000 and now has beenrnexpanded increasing its capacity to 60 mgd (maximum month flow basis). The expanded plantrnproduces high-quality water which discharges to the Chattahoochee River downstream of LakernLanier. When construction of the new discharge line and outfall to Lake Lanier is completed andrnoperational, the treated product water will discharge directly to the lake – the County’s raw waterrnsupply source. The NPDES permit for the lake discharge requires the monthly average totalrnphosphorus, ammonia-nitrogen, and turbidity to not exceed 0.08 mg/L P, 0.4 mg/L NH3-N, andrn0.5 NTU, respectively.rnAfter an extensive 1-year testing period in 2001 and an evaluation of performance, cost, andrnother factors, membrane filtration using ultrafiltration was selected as part of the advancedrntreatment processes to treat secondary effluent. The Zenon ZW-500c membrane process was thernhighest-ranked proposal following a selection process in 2002 that evaluated eight differentrnmembrane filtration systems from five manufacturers.rnBiological processes at the existing (Phase 1) plant were designed for complete nitrification,rnpartial denitrification, and phosphorus reduction. Tertiary treatment processes included ferricrnchloride chemical coagulation/clarification followed by granular media filters, pre-ozone andrngranular activated carbon (biologically enhanced activated carbon), and ozone disinfection.rnThe selected process train for the Phase 2 plant expansion treating secondary effluent included:rn1. Metal salt coagulant addition/clarification for reduction of phosphorus, organics and solidsrn2. Screening with drum-type in-channel prefiltersrn3. Particle filtration with ultrafiltration for turbidity and particle (pathogen) removalrn4. Blending with the existing media filter effluent followed by pre-ozone/granular activatedrncarbon for organics removalrn5. Final ozonation for disinfection.rnIn the summer of 2002 a three month Membrane System “Proof Test” was started with the ZW-rn500c pilot-scale system to confirm design criteria and projected operating costs. Simultaneously,rnpreliminary design commenced incorporating the membrane system into the constructionrncontract documents for the full-scale facility.rnThe UF system consists of 16 parallel process trains with a high degree of redundancy for addedrnreliability. Full production capacity 48 mgd permeate can be met with 14 trains in service and allrncritical auxiliary equipment and piping are designed for redundancy with backups. Each trainrnhas a capacity of 3.6 mgd feed flow and operates at a minimum recovery of 96% at 20 C.rnThe Phase 2 construction began on the AWT (advanced water treatment) facilities in the secondrnquarter of 2003. The testing and commissioning of the first four trains’ 12.5 mgd total capacityrnbegan in late 2005. By June 2006, all sixteen trains were operational.rnThis paper will summarize the process design of the membrane facility, start-up activities, andrnoperational data during the first full year of operation. The 50 mgd ultrafiltration system is onernof the largest membrane facilities in the world and the largest membrane plant in the EasternrnUSA.
机译：格温内特县位于佐治亚州亚特兰大附近，是该州发展最快的县之一。一个名为F.rnWayne Hill的水处理中心的新的，最先进的20 mgd的水回收和处理设施已于2000年12月投入运营，现在已经扩大到将其容量提高到60 mgd（最大流量）。扩大后的植物产生高质量的水，该水排入LakernLanier下游的Chattahoochee河。当新的排放管线的建设和通往拉尼尔湖的排水口完工并投入运行后，处理后的产品水将直接排入该县的原水供应源湖。 NPDES排放湖泊的许可证要求每月平均总磷，氨氮和浊度分别不超过0.08 mg / LP，0.4 mg / L NH3-N和rn0.5 NTU.rn经过长时间的1年测试在2001年，对性能，成本和其他因素进行了评估，使用超滤膜过滤被选为处理二级废水的高级处理工艺的一部分。 Zenon ZW-500c膜工艺是在2002年的一个筛选工艺之后排名最高的提案，该工艺对来自五家制造商的八种不同的膜过滤系统进行了评估.rn设计现有工厂（第一阶段）的生物工艺以实现完全硝化，部分反硝化和磷还原。第三级处理过程包括氯化铁化学混凝/澄清，然后进行颗粒介质过滤器，臭氧前和颗粒状活性炭（生物增强的活性炭）以及臭氧消毒.rn为第二阶段工厂扩建处理二次废水选择的工艺流程包括：rn1。添加/澄清金属盐凝结剂，以减少磷，有机物和固体rn2。用鼓型通道内预过滤器过滤3。采用超滤进行混浊和去除颗粒（病原体）的颗粒过滤。与现有的介质过滤器流出物混合，然后进行臭氧/颗粒活性炭去除有机物。最终的臭氧消毒。2002年夏天，ZW-rn500c中试规模的系统开始进行为期三个月的膜系统“验证测试”，以确认设计标准和预计的运营成本。同时，开始进行初步设计，将膜系统并入到完整设备的施工合同文件中。UF系统由16个并行过程链组成，具有高度冗余性，以提高可靠性。 14列运行中的火车可满足48 mgd渗透液的全部生产能力，而所有关键辅助设备和管道均经过专门设计，可实现冗余备份。每列火车的进料流量为3.6 mgd，在20 C时的最低回收率为96％。rn第二阶段的建设于2003年第二季度开始在AWT（高级水处理）设施上进行。前四个阶段的测试和调试火车的总产能在2005年底开始达到12.5 mgd。到2006年6月，所有16列火车都已投入运营。本文将总结膜运营的第一个整年的过程设计，启动活动和运行数据。 50 mgd超滤系统是世界上最大的膜设施和美国东部最大的膜工厂之一。

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