Techno-economic analysis and life cycle assessment of thermophilic dark fermentation (TDF) and mesophilic dark fermentation (MDF) integrated with anaerobic digestion (AD) from coffee-manufacturing wastewater (CW) as feedstock were studied. The pilot plants were based in Iran and designed to convert 800 m3/day of CW into hydrogen. The hydrogen volume flow rate (m3/h) under thermophilic conditions was 1.1 times higher than that under mesophilic conditions; however, the hydrogen mass flow rate (kg/h) was approximately equal in both conditions (1.04). The hydrogen production costs for the MDF-AD and TDF-AD plants were 3.86 and 3.84 USD/kg, respectively. A payback period of 1.3 and 1.33 years for the MDF-AD and TDF-AD plants were obtained, respectively. The Global warming potential from the entire system was 0.79 kg CO2-eq/kg hydrogen for the DF-AD plants. The DF commercialization is supported by environmental advantages, despite its higher hydrogen cost than natural gas-based methods.

中文翻译：

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嗜热和嗜温条件下咖啡生产废水中暗发酵制氢与厌氧消化相结合的技术经济和生命周期分析


研究了嗜热暗发酵 （TDF） 和嗜温暗发酵 （MDF） 与咖啡制造废水 （CW） 厌氧消化 （AD） 作为原料相结合的技术经济分析和生命周期评估。试点工厂位于伊朗，旨在将 800 m3/天的 CW 转化为氢气。嗜热条件下的氢气体积流速 （m3/h） 是嗜温条件下的 1.1 倍;然而，氢气质量流速 （kg/h） 在两种条件下大致相等 （1.04）。MDF-AD 和 TDF-AD 工厂的氢气生产成本分别为 3.86 和 3.84 美元/千克。MDF-AD 和 TDF-AD 植物的投资回收期分别为 1.3 年和 1.33 年。DF-AD 工厂整个系统的全球变暖潜能值为 0.79 kg CO2-eq/kg 氢气。尽管 DF 的氢成本高于基于天然气的方法，但它的商业化得到了环境优势的支持。