COST STRUCTURE AND TECHNOLOGY SELECTION OF SEWAGE SLUDGE ENERGY CONVERSION SYSTEM DEPENDING ON URBAN SCALE -COMPARISON OF WASTE CO-FIRING POWER GENERATION AND SLUDGE WASTE HEAT

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  • 都市規模による下水汚泥エネルギー転換システムの費用構造と技術選択－ごみ混焼発電と汚泥廃熱発電の比較－

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In this research, we aimed to provide knowledge on which sort of sludge incinerator in the sewage treatment plant is a better policy for self-governing bodies in the process of renewable energy recovery or energy recovery through collaboration. IC and RC were obtained from the cost structure of energy recovery technology based on city size, and their TC was analyzed as a judgment material. As a result of the analysis, when the city size exceeds 30,000 people, it became clear that self-sustaining energy recovery is a better idea. However, as this result is based on the assumption that sludge treatment has been aggregated, there is a possibility that collection of energy by cooperation may be a better idea in the case where a local government has multiple sludge incinerators. As a result, both energy recovery technologies were found to be a superior technology to change the technology selection depending on the processing situation and spatial arrangement of the sewage treatment plant and aim for cost reduction together.

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