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Draft <br />Evaluation of the North Oimstied, OH <br />Aeration System <br />A Proposal <br />Background <br />The City of North Olmsted operates a municipally owned wastewater treatment <br />facility with a 1983 design capacity of 7.0 MGD. In the period of November 1988 <br />and July 1995 numerous violations of the NPDES effluent permit occurred. A <br />1993 study and a subsequent $2.8 million improvement project were in place by <br />July 1995. Since August 1995 the wastewater treatment plant has been in <br />compliance w~h its NPDES permit. In 1995 the average flow processed by the <br />facility was 7.6 MGD or 110% of the design prior to the improvement projects. In <br />the first 11 months of 1996 the average flow was 7.67 MGD with a maximum <br />month of 9.92 MGD and in 5/11 months the average flow exceeded 8.0 MGD. <br />Project Scope <br />The WWTP has had 1.5 years of operation since the 1993 improvements were <br />completed. This data and the modified design of the facilities would be the basis <br />of an analysis of facility. The request for proposal identified the follaw'rng overall <br />objectives of the project: <br />1. An evaluation of the existing single activated sludge aeration <br />process at the Citys' wastewater treatment plant. <br />2. A report documenting the aeration process evaluation and <br />containing recommendations for future capital and non-capital <br />improvements which may reduce the periodic and excessive <br />growth of Nocardia, Type 021 N and Microthrix parvicella bacteria in <br />the aeration process. <br /> <br />