Recurring summer cyanobacteria blooms in the Baltic Sea has gained academic interests for decades. The harvest of wild cyanobacteria, for example, Nodularia spumigena, during summer blooms in the Baltic Sea has been studied in the past but lacked evaluation for environmental and economic performances. This study provides a first-hand assessment of environmental and economic performance from an energy perspective, using energy return on investment (EROI) as evaluation method where harvest of biomass and the downstream conversion of biomass to biogas and biofertilizer are considered for Gotland, Sweden. Energy analysis results indicate fuel consumption during harvest and transport operations to be the major energy consumer. Traditional sailing boats have been suggested as an alternative. Overall, when considering only biogas yield and usage of sailing boats, a break-even EROI of 1 is achieved. When including biofertilizer as product, a breakeven EROI of 1 is also achieved. Depending upon the biomass concentration in the Baltic Sea at the time of harvest, an EROI > 6 is possible, surpassing the economic viability EROI benchmark of 3, indicating the importance of nutrient recovery as the driver for harvest of wild cyanobacteria biomass during blooms in the Baltic Sea. This article met the requirements for a gold-gold JIE data openness badge described at http://jie.click/badges.

中文翻译：

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评估在波罗的海海藻盛开期间收获野生泡沫球藻的能源投资回报

几十年来，波罗的海反复出现的夏季蓝藻大量繁殖引起了学术界的兴趣。野生蓝藻的收获，例如，Nodularia spumigena，过去曾研究过波罗的海夏季开花，但缺乏对环境和经济绩效的评估。本研究从能源的角度提供了对环境和经济绩效的第一手评估，使用能源投资回报率 (EROI) 作为评估方法，其中考虑了瑞典哥特兰岛生物质的收获以及生物质向沼气和生物肥料的下游转化。能源分析结果表明，收获和运输过程中的燃料消耗是主要的能源消耗。传统的帆船已被建议作为替代方案。总的来说，如果只考虑沼气产量和帆船的使用，可以实现 1 的盈亏平衡 EROI。当包括生物肥料作为产品时，也实现了 1 的盈亏平衡 EROI。根据收获时波罗的海的生物量浓度，EROI > 6 是可能的，超过 3 的经济可行性 EROI 基准，表明养分恢复作为波罗的海水华期间野生蓝藻生物量收获的驱动力的重要性波罗的海。这篇文章满足了金-金的要求JIE数据开放徽章在 http://jie.click/badges 中描述。