School of Infrastructure, Indian Institute of Technology Bhubaneswar, Odisha, 752050, India.
School of Infrastructure, Indian Institute of Technology Bhubaneswar, Odisha, 752050, India.
J Environ Manage. 2024 Apr;356:120711. doi: 10.1016/j.jenvman.2024.120711. Epub 2024 Mar 26.
This study evaluated the environmental and economic impacts of substituting synthetic media with greywater for cultivating microalgae in the biofuel production process. Life cycle assessment (LCA) and technoeconomic assessment (TEA) were employed to compare the impacts of two scenarios - one containing bold's basal (BB) media and another containing greywater as growth mediums for microalgae cultivation. Scenarios 1 and 2 mitigated 1.74 and 2.14 kg CO per kg of biofuel production, respectively. Substituting BB media with greywater resulted in a 16.3% reduction in energy requirements, leading to a 79.3% increase in net energy recovered. LCA findings demonstrate a reduction in all seven environmental categories. TEA reveals that, despite a 21.7% higher capital investment, scenario 2 proves more economically viable due to a 39.8% lower operating cost and additional revenue from wastewater treatment and carbon credits. The minimum selling price of biofuel dropped from Rs 73.5/kg to Rs 36.5/kg, highlighting the economic and environmental advantages of substituting BB media with greywater in microalgal biofuel production.
本研究评估了在生物燃料生产过程中，用灰水替代合成介质来培养微藻的环境和经济影响。采用生命周期评估（LCA）和技术经济评估（TEA）来比较两种方案的影响，一种方案包含 Bold's basal（BB）培养基，另一种方案则使用灰水作为微藻培养的生长介质。方案 1 和 2 分别将每公斤生物燃料生产的 CO 排放量减少了 1.74 和 2.14 公斤。用灰水替代 BB 培养基可将能源需求降低 16.3%，从而使净能源回收增加 79.3%。LCA 的结果表明，所有七个环境类别都有所减少。TEA 显示，尽管方案 2 的资本投资增加了 21.7%，但由于运营成本降低了 39.8%，以及废水处理和碳信用额带来的额外收入，方案 2 在经济上更具可行性。生物燃料的最低销售价格从 73.5 卢比/公斤降至 36.5 卢比/公斤，突出了在微藻生物燃料生产中用灰水替代 BB 培养基的经济和环境优势。
