Environmental Impact Assessment of Nationwide Introduction of Plant Biomass Mixed Dehydration Systems at Wastewater Treatment Plants

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  • Yamazaki Yukiyo
    Public Works Research Institute, National Research and Development Corporation, Advanced Materials and Resources Research Center
  • Shigemura Hiroyuki
    Public Works Research Institute, National Research and Development Corporation, Advanced Materials and Resources Research Center

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  • 下水処理場への植物系バイオマス混合脱水システム導入における環境影響評価

Abstract

We investigated the impact on greenhouse gas emissions (GGE) from nationwide introduction of a plant biomass mixed dehydration system at wastewater treatment plants (WWTP). The system is targeted at WWTPs that use belt press dehydrators, screw press dehydrators and centrifugal dehydrators.<br>　Results showed that installing a plant biomass mixed dehydration system at a WWTP can reduce GGE by 7.8%-12% through incineration at the WWTP. Furthermore, moving dehydrated cake away from WWTP and disposing of it can reduce GGE by 7.1%-7.7%. Moreover, by reducing coagulant amounts used for the system, we were able to reduce GGE by 5.8%-6.3% and 12%-22%, respectively.<br>　Results show that the introduction of a mixed dehydration system for plant biomass in WWTP can reduce GGE and can provide effective utilization of unused plant biomass and reduction of sludge disposal costs.

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