佐治亚州格温内特县开展了一项膜试验和示范测试项目，以 与现有的“高石灰”工艺路线进行比较，以便在第三阶段进行可能的选择 40 mgd工厂扩建的处理设施。微滤（MF）、超滤（UF）， 纳滤（NF）膜通过几种预处理工艺进行了测试。这个 二级污水处理厂扩建的选定三级处理工艺 包括:添加混凝剂和澄清磷、固体和水 有机物还原；用于较大尺寸固体的过滤器或滤网（500微米或更细） 在MF/UF之前减少；去除亚微米颗粒的MF或UF膜 （包括微生物）；臭氧消毒后的颗粒活性炭（GAC） 有机还原；最后用臭氧消毒。膜系统选择 参与评估通过资格预审的MF/UF建议书，考虑初始价值和现值 成本和几个特定的定性因素，“验证测试”选定的膜系统 二级出水化学澄清后，加入预选的MF 或将UF系统纳入整个三级处理设施的设计和施工招标 文件。包括表格、数字。

Gwinnett County, Georgia conducted a membrane pilot and demonstration test program to compare with the existing "high-lime" process train for possible selection in the tertiary treatment facilities of a 40 mgd plant expansion. Microfiltration (MF), ultrafiltration (UF), and nanofiltration (NF) membranes were tested with several pretreatment processes. The selected tertiary treatment process for the plant expansion treating secondary effluent included: coagulant addition and clarification for phosphorus, solids, and organics reduction; strainers or screens (500 micron or finer) for larger-size solids reduction prior to MF/UF; MF or UF membranes for submicron particle removal (including microbes); granular activated carbon (GAC) following ozone for disinfection and organic reduction; and, final ozone for disinfection. Membrane system selection involved evaluating prequalified-MF/UF proposals considering initial and present worth costs and several specified qualitative factors, "proof testing" the selected membrane system following chemical clarification of secondary effluent, and incorporating the preselected MF or UF system into the overall tertiary treatment facility design and construction bid documents. Includes tables, figures.