乔治亚州亚特兰大市的格温内特县是美国发展最快的县之一。该县新的每天2000万加仑（mgd）先进水资源回收设施，名为F.Wayne Hill water ResourcesCenter（F.W.H.WRC），于2000年底投入使用，将市政废水处理至接近饮用水质量。该工厂的生物工艺设计用于完全硝化、部分反硝化和磷还原。三级处理工艺包括高pH石灰（两级沉淀/再碳化和颗粒介质过滤器）、带预分区的颗粒活性炭（GAC）和最终臭氧氧化。最初的膜评价研究于1996年和1997年进行。 这些研究包括平板膜台架试验、单元素试验和使用微滤（MF）、超滤（UF）和纳滤（NF）膜的短期多元素中试规模试验。由于当时没有建造F.W.H.WRC，测试是在附近的一个回收厂进行的。膜产品（出水）水质很好，但膜清洗周期短于预期。在最初的工厂建设中安装了全尺寸高pH石灰和GAC工艺，以及一个平行的膜示范设施。如果在未来的研究中显示膜在技术上是可行的、可靠的和经济上合理的，则该县决定考虑全尺寸的膜膨胀工艺。 如果膜工艺用于三级处理，则将使用20 mgd物理/化学工艺处理膜废水。由于温尼特县的快速发展以及预期的困难和耗时的介电过程，在2000年中期，甚至在最初的20 mgd设施完全建成并投入运行之前，就开始了40 mgd扩建工厂的设计（将设施容量增加三倍至60 mgd）。最初的设计包括aMF/UF中试设施，该设施与膜过滤系统并行运行，并允许对几个额外的膜产品进行评估，其中许多在1996年和1997年设计示范工厂时不可用。 中试工厂还评估了在部分MF/UF系统之前的化学混凝添加，以提高磷和有机物去除能力，并改善膜操作。初步和生物处理工艺扩建的工艺设计与膜示范和中试项目同时进行。在工厂进行了6到12个月的膜测试（从2001年1月开始），将膜处理与全尺寸高pH石灰和GAC工艺进行比较，并决定在工厂扩建中使用哪些三级处理工艺。然后，将使用选定的工艺完成工厂设计。包括桌子。

Gwinnett County, in metropolitan Atlanta, Georgia is one of the fastest growingcounties in the nation. The County's new 20 million gallons per day (mgd)advanced water reclamation facility, named the F. Wayne Hill Water ResourcesCenter (F.W.H. WRC) became operational in late 2000 and treats municipalwastewater to near-potable water quality. Biological processes at the plant aredesigned for complete nitrification, partial denitrification, and phosphorusreduction. Tertiary treatment processes include high pH lime (two-stageclarification/recarbonation and granular media filters), granular activatedcarbon (GAC) with preozonation, and final ozonation. Initial membrane evaluationstudies were performed in 1996 and 1997. These studies included flat-sheetmembrane bench tests, single-element tests, and short-term multiple-elementpilot-scale tests using microfiltration (MF), ultrafiltration (UF), andnanofiltration (NF) membranes. Because the F.W.H. WRC was not constructed at thetime, the testing was conducted at a nearby reclamation plant. Membrane product(effluent) water quality was very good, but the membrane cleaning interval wasshorter than desired. Full-scale high pH lime and GAC processes were installed inthe initial plant construction as well as a parallel membrane demonstrationfacility. The County decided to consider full-scale membrane processes for theplant expansion if membranes are shown in future studies to be technicallyfeasible, reliable, and economically justified for this application. If membraneprocesses are used for tertiary treatment, the 20 mgd physical/chemical processeswill be used to treat membrane waste streams. Because of the rapid growth inGwinnett County and the anticipated difficult and time-consuming permittingprocess, the design of a 40 mgd expansion to the plant (tripling the capacity ofthe facility to 60 mgd) was begun in mid-2000, even before the initial 20 mgdfacility was fully-constructed and operational. The initial design included aMF/UF pilot test facility which operates in parallel with the membranedemonstration systems and allows evaluation of several additional membraneproducts, many of which were not available at the time the demonstration plantwas designed in 1996 and 1997. The pilot plant also evaluates chemical coagulantaddition prior to some of the MF/UF systems for increased phosphorus and organicremoval capability and potential membrane operational improvement. Process designfor expansion of preliminary and biological treatment processes is occurringsimultaneously with the membrane demonstration and pilot test program. After 6 to12 months of membrane testing at the plant (beginning January 2001), membranetreatment will be compared to full-scale high pH lime and GAC processes, and adecision on which tertiary treatment processes for use in the plant expansionwill be made. The plant design will then be completed using the selectedprocesses. Includes tables.