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<br />2020 Solid Waste and Moderate <br />Risk Waste Management Plan Update <br /> <br />6-8 AX0304191054PDX <br />Table 6-6. General Overview of Conversion Technologies <br />Process Preprocessing By-Product Product <br />Commercial <br />Readiness for <br />Solid Waste <br />Pyrolysis High Char/Ash/Tar/Oil Syngas Yes <br />Gasification Medium Ash/Slag Syngas Yes <br />Anaerobic Digestion Medium/High Filtrate Water Biogas, Compost Yes <br />Hydrolysis High Wastewater, Ash Ethanol No <br />Aerobic Digestion Medium/High None Compost Yes <br />Plasma Gasification Claims Low Slag/Blowdown Syngas No <br />There are currently a number of municipalities considering alternative disposal technologies. For <br />purposes of this Plan, a list of projects under consideration is not included as this list will remain dynamic <br />during the planning period. An updated list of projects can be provided separately from this Plan. <br />6.4.1 Alternative Disposal Technologies Needs and Opportunities <br />The risks associated with conversion technologies can be substantial. As such, these technologies are <br />not recommended at this time for Kittitas County. However, the County may want to track the progress of <br />pilot studies and those plants that have been or will soon be operating. Technologies that may be <br />particularly of interest to the County would be anaerobic digestion and hydrolysis. These technologies <br />have been proven to be successful in the processing of municipal solid waste and organics, and <br />particularly in the case of biosolids. <br />The following criteria can be used by the County in the future to assess a particular conversion <br />technology: <br /> Degree and Scale of Operating Experience: Some technologies have only been proven in pilot or <br />laboratory operations, or with raw materials other than municipal solid waste. Other technologies <br />have only been commercially operated in small facilities and the scale up to larger sized plants may <br />result in unforeseen problems. <br /> Reliability to Dispose of Municipal Solid Waste: The technology selected must be able to dispose <br />of solid waste in a reliable manner without frequent downtime resulting in diversion of such waste to <br />landfills. <br /> Energy and Material Market Compatibility: The technology must be capable of recovering energy <br />and materials for which markets are available. <br /> Environmental Acceptance: The technology must meet all permitted environmental requirements <br />established by regulatory agencies. <br /> Cost to the County: The technology must dispose of the County’s solid waste at a price the County <br />can afford and be comparable in cost and benefits to alternative means of disposal. <br />6.4.2 Alternative Disposal Recommended Options and Implementation Actions <br />The following options for considering alternative disposal are recommended. Each option and the <br />associated implementation actions are discussed below. <br />6.4.2.1 Future Consideration and Feasibility <br />Maintain energy recovery and incineration as an option for study and consideration if future needs and <br />conditions support its use.