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SDWA Compliance and Planning Study for a Small Connecticut Surface Water Treatment Plant

机译：小型康涅狄格州地表水处理厂的SDWA合规性和规划研究

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The Connecticut Water Company (CWC) owns and operates the Stafford Springs Water Treatment Plant (SSWTP), located in Stafford, CT. The SSWTP is a 1.0-MGD facility that utilizes chlorine preoxidation, alum coagulation, Pulsator? upflow clarification and GAC monomedia filtration. The facility produces high quality water that meets all current drinking water regulations, but like many utilities, may not meet all requirements of future regulations. Metcalf & Eddy Inc., in conjunction with CWC, conducted a feasibility study to determine the status of the plant with respect to current and expected regulations, and to determine the process improvements that would be necessary with all facets of pending regulations. A significant constraint was that the plant must remain in full service during construction of any recommended improvements.rnA primary goal of the study was to examine alternate preoxidants for chlorine in order to achieve compliance with the Disinfectants/Disinfection Byproducts Rules (D/DBPR). A jar test program and subsequent intra-plant sampling program confirmed that prechlorine was forming significant levels of DBPs within the plant. The SSWTP raw water quality necessitates a preoxidant, and the most promising preoxidants appeared to be chlorine dioxide or potassium permanganate. Each preoxidant was investigated in further detail and compared on the basis of feasibility and cost.rnAnother major objective of the study was to determine the most feasible enhanced disinfection process for compliance with potential Cryptosporidium inactivation requirements of the Enhanced Surface Water Treatment Rule. A list of alternatives was screened down to the three most promising options: intermediate ozonation, ultraviolet disinfection, and replacement of Pulsator? clarification or immersed-membrane microfiltration. Conceptual layouts were developed for each of the alternatives and all were compared on the basis of disinfection efficiency, construction considerations, capital cost, operations cost, and present worth.rnThe study resulted in a list of recommended improvements for the SSWTP that will result in compliance with the D/DBPR while maintaining effective disinfection. Full-scale testing of chlorine dioxide was recommended, and ultraviolet disinfection was selected as the most feasible enhanced disinfection process for future installation. A phased implementation plan was then developed to assist the CWC with operations and fiscal planning.
机译：康涅狄格州自来水公司（CWC）拥有并经营位于康涅狄格州斯塔福德的斯塔福德泉水处理厂（SSWTP）。 SSWTP是一种1.0-MGD设施，利用氯预氧化，明矾凝结，Pulsator？上流澄清和GAC单介质过滤。该工厂生产的高质量水可以满足当前的所有饮用水法规，但像许多公用事业公司一样，可能无法满足未来法规的所有要求。梅特卡夫与埃迪公司（Metcalf＆Eddy Inc.）与CWC共同进行了可行性研究，以根据当前和预期法规确定工厂的状况，并确定所有待处理法规所必需的过程改进。一个重要的限制是该工厂在任何建议的改进措施的建造过程中必须保持充分使用。研究的主要目的是检查替代的预氧化剂中的氯，以确保符合《消毒剂/消毒副产物规则》（D / DBPR）。罐子测试程序和随后的工厂内采样程序确认，前氯在工厂内形成了显着水平的DBP。 SSWTP原水的质量需要预氧化剂，最有希望的预氧化剂似乎是二氧化氯或高锰酸钾。对每种预氧化剂进行了更详细的研究，并根据可行性和成本进行了比较。研究的另一个主要目的是确定最可行的增强消毒工艺，以符合增强地表水处理规则中潜在的隐孢子虫灭活要求。筛选出的替代品清单包括三个最有希望的选择：中间臭氧氧化，紫外线消毒和更换Pulsator？澄清或浸没膜微滤。为每个替代方案制定了概念布局，并根据消毒效率，施工注意事项，资金成本，运营成本和现值对所有方案进行了比较。研究得出了一系列建议的SSWTP改进建议，这些改进将确保合规性与D / DBPR一起使用，同时保持有效的消毒效果。建议对二氧化氯进行全面测试，并选择紫外线消毒作为将来安装最可行的增强消毒工艺。然后制定了分阶段的实施计划，以协助《化学武器公约》的运作和财政计划。

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