Abstract Algal turf scrubbers (ATS) and anaerobic digesters (AD), when combined, remove nutrients from eutrophic water while producing renewable energy through biogas production. Algal biomass was produced from an ATS system that used tipping buckets to introduce riverine water in pulses onto a flow-way with a mesh screen installed to facilitate algal attachment. This study was the first to determine methane (CH4) production from AD of a micro- and macro-algae polyculture, harvested from an ATS, using lab-scale reactors under batch and semi-continuous feeding regimes. The lab-scale study was followed by a pilot-scale (7 m3) ATS-AD study, the largest scale study of biogas production from ATS-derived algae. Batch digestion of ‘wet’ algae (93% moisture) produced 158 ± 13 L CH4/kg VS, which was higher than algae with a lower moisture content (≤62% moisture). Continuing use of ‘wet’ algae as the substrate, the 2 L semi-continuously-fed lab system yielded a maximum CH4 production value of 144 ± 7 L CH4/kg VS, with 60%–62% CH4 in the biogas. The 7 m3 pilot-scale system produced 107 ± 15 L CH4/kg VS, with 66.4% CH4 in the biogas. Scale-up calculations showed that a 1 ha ATS system could capture 8.73 kg N, 1.18 kg P, and 52.5 kg C/ha-d, with the resulting algae being used in AD to produce biogas for direct heating (2.8*108 J) or to power a 1.13 kW generator. While the total energy output from the 1 ha ATS-AD system is relatively low, energy production from the AD system is a supplemental benefit to an ATS system that captures nutrients from eutrophic water. This ATS-AD system could contribute to the overall Chesapeake Bay cleanup, especially in nutrient hot-spots, like the Baltimore Harbor, where high nutrient concentrations support high algal productivity, which would provide substrate for on-site energy production from AD.

中文翻译：

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通过养分管理补充能源生产：藻类草坪洗涤器生物质的厌氧消化系统

摘要 藻类草皮洗涤器 (ATS) 和厌氧消化器 (AD) 结合使用可从富营养化水中去除养分，同时通过沼气生产产生可再生能源。藻类生物质是由 ATS 系统生产的，该系统使用翻斗将河水以脉冲形式引入流道，并安装了网状筛网以促进藻类附着。本研究首次使用实验室规模的反应器在分批和半连续进料方式下确定从 ATS 收获的微型和大型藻类混养的 AD 产生的甲烷 (CH4) 产量。实验室规模研究之后是中试规模（7 立方米）ATS-AD 研究，这是对 ATS 衍生藻类生产沼气的最大规模研究。“湿”藻类（93% 水分）的批量消化产生 158 ± 13 L CH4/kg VS，这高于具有较低水分含量（≤62% 水分）的藻类。继续使用“湿”藻类作为底物，2 L 半连续进料实验室系统产生的最大 CH4 产量值为 144 ± 7 L CH4/kg VS，沼气中含有 60%–62% CH4。7 m3 中试规模系统产生 107 ± 15 L CH4/kg VS，沼气中的 CH4 为 66.4%。放大计算表明，一个 1 公顷的 ATS 系统可以捕获 8.73 kg N、1.18 kg P 和 52.5 kg C/ha-d，产生的藻类用于 AD 以生产用于直接加热的沼气 (2.8*108 J)或为 1.13 kW 发电机供电。虽然 1 公顷 ATS-AD 系统的总能量输出相对较低，但 AD 系统产生的能量是对从富营养化水中捕获养分的 ATS 系统的补充好处。该 ATS-AD 系统可以为切萨皮克湾的整体清理做出贡献，