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<p>This study aims to develop a comprehensive model that evaluates the economic factors and greenhouse gas emissions throughout the entire life cycle of a 120 t/d cassava starch production plant utilizing excess biogas for heat and electricity generation in Vietnam. Although greenhouse gas emissions were assessed across the entire cassava starch value chain, the analysis focuses on factory-level biogas utilization as the primary lever for sustainability improvement. A comparison was conducted between the current base case, which uses biogas for drying, and the proposed biogas-to-electricity (BtE) case. The total fossil energy consumption is 3,730.7&#xa0;MJ/t for the Base case and 2,901.7&#xa0;MJ/t for the BtE case. Greenhouse gas emissions are 0.72 tCO<sub>2</sub>eq/t in the BtE case and 0.79 tCO<sub>2</sub>eq/t in the Base case. Compared to the Base case, the BtE case requires an additional fixed capital investment of $0.82&#xa0;M but results in annual production cost savings of $0.12&#xa0;M. For a cassava starch plant upgrading to BtE, the payback period is 6.6&#xa0;years with a return on investment of 15%. Vietnam can reduce greenhouse gas emissions by 200,000 tCO<sub>2</sub>eq/y by utilizing biogas from cassava starch factories.</p>

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Sustainable Biogas Utilization from Cassava Starch Plants: Techno-Economic Feasibility, and Greenhouse Gas Emissions

  • 期刊论文

  • 发表日期：

    2026年3月12日

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  • Truong Xuan Do

摘要

This study aims to develop a comprehensive model that evaluates the economic factors and greenhouse gas emissions throughout the entire life cycle of a 120 t/d cassava starch production plant utilizing excess biogas for heat and electricity generation in Vietnam. Although greenhouse gas emissions were assessed across the entire cassava starch value chain, the analysis focuses on factory-level biogas utilization as the primary lever for sustainability improvement. A comparison was conducted between the current base case, which uses biogas for drying, and the proposed biogas-to-electricity (BtE) case. The total fossil energy consumption is 3,730.7 MJ/t for the Base case and 2,901.7 MJ/t for the BtE case. Greenhouse gas emissions are 0.72 tCO2eq/t in the BtE case and 0.79 tCO2eq/t in the Base case. Compared to the Base case, the BtE case requires an additional fixed capital investment of $0.82 M but results in annual production cost savings of $0.12 M. For a cassava starch plant upgrading to BtE, the payback period is 6.6 years with a return on investment of 15%. Vietnam can reduce greenhouse gas emissions by 200,000 tCO2eq/y by utilizing biogas from cassava starch factories.