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Comparative life-cycle assessment of various harvesting strategies for biogas production from microalgae: Energy conversion characteristics and greenhouse gas emissions

机译：Comparative life-cycle assessment of various harvesting strategies for biogas production from microalgae: Energy conversion characteristics and greenhouse gas emissions

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摘要

Biogas production via anaerobic digestion is highly attractive in the realm of microalgae technology. However, the microalgae harvesting strategies for biogas production has yet to be comprehensively evaluated. Here, a comparative life-cycle assessment for microalgae harvesting scenarios of centrifugation (CT), sedimentation and centrifugation (SD-CT), flocculation and centrifugation (FC-CT), flocculation and electro-flotation (FC-EF) were conducted to evaluate the energy conversion characteristics and environmental impacts. The results showed that harvesting strategies significantly affected the net energy yield of the whole system. Only scenarios FC-CT and FC-EF achieved positive net energy yield of 0.17 and 0.04 MJ with 1 MJ net energy output. The net energy yield of scenarios SD-CT and CT were negative (-0.11 and-1.92 MJ) because of the low harvesting efficiency and high electricity consumption. The net GHG emissions of the four scenarios were all positive, and scenario FC-EF achieved the least GHG emissions (21.86 g CO2-eq MJ-1). According to the nutrient balance analysis of carbon, about 15 percent carbon from flue gas was fixed by microalgae in the form of soil fertilizer (9.32%) and bio -methane product (5.63%-6.60%). Additionally, harvesting efficiency and biogas yield had the most profound impact on the parameters for two-step and one-step harvesting scenarios.

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