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<br />- 14 - <br /> <br />QUANTITY AND QUALITY OF SLUDGE AND SOLID WASTE PRODUCED BY <br />--- THEMETROPOLITANWASTECONTROLCOMMISSION---- <br /> <br />1. INTRODUCTION <br />----- <br /> <br />The MWCC currently owns and operates 14 wastewater treatment <br />plants, more than 400 miles of intercepting sewers and 58 sewage <br />lift stations in the Metropolitan Area. All of the treatment <br />plants, except Medina, produce sludge, screenings and grit for <br />disposal. The Metro Plant and Seneca also produce ash from the <br />incineration of sludge for disposal. In addition to these <br />facilities, 14 of the lift stations produce screenings. <br /> <br />. <br /> <br />Screenings are the large materials that are removed by bar <br />screens (that have 2-inch openings), such as sticks or rags. <br />Grit is made up of heavy particles in sewage, such as sand and <br />rocks, that will settle when the velocity of sewage is reduced. <br />Screenings and grit removal are known as preliminary treatment. <br />These materials are removed before entering the plant because the <br />material can damage pumps and other mechanical equipment in the <br />plant. These materials are innocuous and can be disposed of in <br />commercial landfills without creating any environmental problems. <br /> <br />The Waste Management Act of 1980 requires the Council an~ the <br />MWCC "... to establish at least one facility for sewage sludge <br />disposal and at least one facility for solid waste disposal." In <br />the law sewage s lu dge disposal faci lit ies means "property owned <br />or leased by a political subdivision and used for interim or <br />final disposal or landspreading of sewage sludge." To <br />accomplish this objective, it is necessary to determine the <br />quantity and quality of the material to be disposed. <br /> <br />. <br /> <br />2. MWCC'S RECOMMENDED !h!! <br /> <br />The MWCC has recently completed its "201" facility plan for the <br />entire metropolitan disposal system. As part of the studies, the <br />MWCC conducted a residual solids management (RSM) study, which <br />analyzed various alternatives to handle the sludge produced at <br />each of the MWCC treatment plants. Siting criteria, marketing <br />and reuse of these residual materials were also a part of this <br />study. <br /> <br />The RSM study used information gathered in other studies that <br />formed part of the MWCC 201 plan to determine the quantity of <br />sludge and solid waste it must process and dispose. Alternative <br />sludge processes were evaluated for each treatment plant. The <br />alternatives considered were local processing and local disposal, <br />regional processing and regional disposal and central processi,ng <br />and central disposal. <br /> <br />Based on the RSH study and comments received at the public <br />hearing, the MWCC has recommended the following plan: <br />