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?b .., ?Similar Project Experience 6-1 nce Mettaff & Eddy As illustrated below, M&E provides to North Olmsted all of the elements needed to successfully complete your centrifuge project. • Centrifuge design and construction experience; and • Experience working with North Olmsted personnel at your WWTP. The project summaries presented below provide M&E's experience in more detail. Wastewater Treatment Plant Improvements, City of North Olmsted, Ohio The North Olmsted WWTP is implementing a series of plant modifications to improve operability, malcunize capacity from existing facilities, reduce odors complaints, and reduce operating costs. M&E is providing design services for improvements which aze being implemented by WWTP staff. Services provided to date include: ? plans for liquid sodium hypochlorite to replace chlorine gas for disinfection, ? aeration tank baffle plans to implement biological nutrient removal for phosphorus removal, procurement recommendations, specifications review, and ? preliminary layouts for centrifuge dewatering to replace the existing Zimpro sludge. Blue Plains Wastewater Treatment Plant Expansion, Washington, D.C. As part of a major expansion contract, M&E provided construction management, including shop drawing reviews and other engineering services of a contract which installed seven high-solids centrifuges to replace vacuum filters. The contract included centrifuge feed pumps; polymer batching and feed systems and screw conveyors to transfer and transport dewatered sludge cake. The centrifuges provided are Sharples Model DS-706 units with DC backdrives and advanced brake controls. Two sludge cake pumps were also installed as backup to the main output conveying systems. In a separate contract, M&E is providing startup services for the centrifuge operation which includes prepaxation of standard operating procedures, operator training which included development of a computer-based centrifuge simulation model, startup and operations assistance, and round-the-clock operation of the dewatering system to debug systems and demonstrate system performance. M&E has developed tools to assist the operations staff in centrifuge tuning that address various blends of primary and waste activated sludges and methods to reduce polymer consumption.