Dalton Cormac, Okolie Jude A, Davis Paul, Gunes Burcu
School of Biotechnology and DCU Water Institute, Dublin City University, Glasnevin, Dublin, Ireland.
St. Peter's College, Muenster Canada.
Heliyon. 2022 May 23;8(5):e09522. doi: 10.1016/j.heliyon.2022.e09522. eCollection 2022 May.
This paper outlines the sustainable management of the whiskey distillery by-products, known as draff and pot ale, through anaerobic digestion (AD). The substrates were pre-treated using 0.6M NaOH and high shear homogenizer for 24 h. Substrate pre-treatment helped improve the digestabilility of lignocellulosic materials towards AD. In addition, the complex cellulose, hemicellulose and lignin contents are disintegrated. A continuous stirred tank reactor with a volume of 1766 m and organic loading rate of 4.04 kg COD/m/day operating under mesophilic conditions for 30 days was designed to facilitate the complete digestion of the substrates. Compared with the conventional digesters, the proposed novel pre-treatment method achieved a 20% increase in methane yield. The energy recovery potential using a combined heat and power unit can cover 24 and 42.5% of the thermal and electrical demand of the distillery, respectively. The capital cost of the proposed facility was estimated as €3.6 million with a payback period of 9.60 years. In comparison, there is a payback period of 15.13 years without the pre-treatment. Additionally, this model decreases the distillery's carbon footprint by 33%. Although the proposed design applies to the distillery in Ireland, results could be used to design distillery plants in other countries.
本文概述了通过厌氧消化（AD）对威士忌酒厂副产品（即酒糟和麦芽汁）进行可持续管理的方法。使用0.6M氢氧化钠和高剪切均质机对底物进行预处理24小时。底物预处理有助于提高木质纤维素材料对厌氧消化的消化率。此外，复杂的纤维素、半纤维素和木质素含量被分解。设计了一个体积为1766立方米、有机负荷率为4.04千克化学需氧量/立方米/天的连续搅拌槽式反应器，在中温条件下运行30天，以促进底物的完全消化。与传统消化器相比，所提出的新型预处理方法使甲烷产量提高了20%。使用热电联产机组的能量回收潜力分别可满足酒厂24%的热需求和42.5%的电需求。所提议设施的资本成本估计为360万欧元，投资回收期为9.60年。相比之下，未经预处理的投资回收期为15.13年。此外，该模型使酒厂的碳足迹减少了33%。尽管所提议设计适用于爱尔兰的酒厂，但结果可用于设计其他国家的酒厂。
