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首页> 外文会议>Annual conference exposition of Water Environment Federation >AN INNOVATIVE RECIRCULATING SAND FILTER (RSF) SYSTEM SOLVES A SMALL WISCONSIN COMMUNITY’S LARGE WASTEWATER TREATMENT PROBLEMS: A CASE STUDY
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AN INNOVATIVE RECIRCULATING SAND FILTER (RSF) SYSTEM SOLVES A SMALL WISCONSIN COMMUNITY’S LARGE WASTEWATER TREATMENT PROBLEMS: A CASE STUDY

机译：一种创新的循环砂滤器（RSF）系统解决了一个小型威斯康星州群落的大型废水处理问题：一个案例研究

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The Village of Stetsonville, Wisconsin, had a problem with its wastewater treatment system. The former two-cell aerated lagoon treatment system had not been in compliance with its Wisconsin Pollutant Discharge Effluent Standards (WPDES) permit for several years. High effluent ammonia nitrogen levels during cold weather and excessive algae growth during warm weather periods contributed to high biological oxygen demand (BOD) and suspended solids (SS) levels, continually placing the plant out of compliance. A practical and effective wastewater treatment solution was needed to bring the plant into compliance. An innovative approach that used the existing lagoon system for pretreatment followed by secondary treatment through a recirculating sand filter (RSF) was designed and implemented. In this design, the primary lagoon was split into two stages by a new dike. The first stage incorporates pre-aeration followed by settling to provide pretreatment before transfer to the RSF system. The pretreatment zone level is allowed to vary for storage of higher flow rates during wet weather. The pretreatment zone also is covered by a grid of floating insulating panels to prevent heat loss during cold weather and to shield the wastewater from sunlight, preventing algae growth during warm weather. Flow from the pretreatment zone to the sand filter recirculation tank is paced by a flow control system. The second stage of the primary lagoon is used for emergency storage of excess wet weather wastewater flow, which is returned to the pretreatment zone via a new lift station when emergency conditions have ceased. A 300-by-100-foot recirculating sand filter with eight zones was constructed to provide secondary stabilization of pretreated wastewater. A programmable logic control (PLC) system is used to control the effluent dosing to each zone in the sand filter. The control system is designed to provide maximum flexibility of operation. This allows for adjusting the recirculation ratio, which impacts the degree of nitrification achieved under different conditions. The results of this project have proven to be successful. The Village is now in compliance with its WPDES permit limits for BOD, SS, and ammonia nitrogen during warm and cold weather conditions. This paper will describe the different stages of this project, including funding development, design, construction, and start-up. Additionally, this paper will present a summary of the plant’s first year of operation, including the data collected that indicates the system’s ability to meet specific treatment requirements under varying seasonal conditions.
机译：威斯康星州的斯托森维尔村遇到了污水处理系统问题。前两胞气孔泻湖治疗系统尚未遵守其威斯康星州污染物排放废水标准（WPDES）许可证数年。在温暖的天气期间寒冷天气和过度藻类生长期间的高污水氨氮水平导致高生物需氧量（BOD）和悬浮的固体（SS）水平，不断将植物置于依从性之外。需要一种实用且有效的废水处理溶液使植物依从性。设计并通过再循环砂滤器（RSF）使用现有的泻湖系统进行预处理的现有泻湖系统的创新方法。在这种设计中，主要的泻湖被一个新的堤防分为两个阶段。第一阶段包含预处理，然后沉淀到转移到RSF系统之前提供预处理。允许预处理区域水平因湿天气期间储存更高的流速而变化。预处理区域也被浮动绝缘板的网格覆盖，以防止寒冷天气中的热量损失，并保护废水免受阳光，防止藻类生长在温暖的天气中。通过流量控制系统从预处理区域流到砂滤网再循环罐。主要泻湖的第二阶段用于过量潮湿天气废水流动的紧急储存，当紧急情况停止时，通过新的提升站返回预处理区。构建了具有八个区域的300×100英尺的循环过滤器，以提供预处理废水的二次稳定。可编程逻辑控制（PLC）系统用于控制砂滤光器中的每个区域的流出物。控制系统旨在提供最大的操作灵活性。这允许调节再循环比，从而影响在不同条件下所实现的硝化程度。该项目的结果已被证明是成功的。该村目前符合其WPDES在温暖和寒冷的天气条件下对BOD，SS和氨氮限制限制。本文将描述该项目的不同阶段，包括资金开发，设计，建设和启动。此外，本文将概述工厂的第一年的操作摘要，包括所收集的数据，表明系统符合不同季节性条件下的特定治疗要求的能力。

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