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In early 2003, the City of Delphos, Ohio began the process of counteracting decades of skirmishes in and out of compliance. A history of both administrative and technical non-compliance had to be addressed and altered. The City had several problematic driving factors and goals that would ultimately result in the design of a new membrane bioreactor (MBR) advanced wastewater treatment facility. First, the City was committed to constructing a facility that had the capability of not just meeting, but exceeding its permitted discharge levels. Second, the facility had to accommodate the large variations in flow that the 70 percent combined sewer community experienced on a regular basis. Third, the technology selected and designed for the community had to be flexible enough to allow for incremental growth or decay in the treatment of the City's high carbonaceous biochemical oxygen demand (CBOD5) / total suspended solids (TSS) industrial loads. Fourth, it was the City's preference to relocate the facility to an area outside of town. Over the years the town had grown around the current trickling filter facility. What immediately surrounded the plant was the City's recreation area, and there had been many odor issues in the past. Finally, the City had to satisfy conditions of enforcement action brought on by the Ohio Environmental Protection Agency (OEPA). This action was in the form of a consent decree. There were many steps taken and issues encountered and resolved in order to ensure that all of these goals were addressed. The purpose of this paper is to describe the process with which the City and its engineers made the necessary decisions, considering all of the goals that the City had set for the project, resulting in the facility that is currently under construction. Because the facility is an MBR, the authors felt it was necessary to share in a timely manner the design process utilized. This presentation describes an example of how a City in conjunction with its engineers and the regulatory agency can work together to achieve results that will benefit not only the local citizens, but also the local watershed and the water environment as a whole. The paper will discuss the design decision process, time-line issues, redevelopment of the Long Term Control Plan to address the City's wet weather issues and possible construction issues to date. It is the authors' intents to provide a subsequent update on performance once the facility is on-line.
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Document Type: Research Article

Publication date: 2005-01-01

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