DIATI, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy.
Sustainable Chemistry (Resource Efficiency), Institute of Sustainable and Environmental Chemistry, Leuphana University of Lüneburg, C13.203, 21335 Lüneburg, Germany.
Bioresour Technol. 2017 Oct;241:508-516. doi: 10.1016/j.biortech.2017.05.174. Epub 2017 May 31.
This work concerns the investigation of the sequential production of lactic acid (LA) and biogas from food waste (FW). LA was produced from FW using a Streptococcus sp. strain via simultaneous saccharification and fermentation (SSF) and separate enzymatic hydrolysis and fermentation (SHF). Via SHF a yield of 0.33g/g (productivity 3.38g/L·h) and via SSF 0.29g/g (productivity 2.08g/L·h) was obtained. Fermentation residues and FW underwent anaerobic digestion (3wt% TS). Biogas yields were 0.71, 0.74 and 0.90Nm/kg for FW and residues from SSF and SHF respectively. The innovation of the approach is considering the conversion of FW into two different products through a biorefinery concept, therefore making economically feasible LA production and valorising its fermentative residues. Finally, a mass balance of three different outlines with the aim to assess the amount of LA and biogas that may be generated within different scenarios is presented.
本工作研究了从食物垃圾（FW）中顺序生产乳酸（LA）和沼气的情况。通过同步糖化发酵（SSF）和单独的酶水解发酵（SHF），利用一株链球菌从 FW 中生产 LA。通过 SHF 获得了 0.33g/g 的产率（生产率为 3.38g/L·h），通过 SSF 获得了 0.29g/g 的产率（生产率为 2.08g/L·h）。发酵残渣和 FW 进行了厌氧消化（3wt% TS）。FW 以及 SSF 和 SHF 发酵残渣的沼气产量分别为 0.71、0.74 和 0.90Nm/kg。该方法的创新之处在于通过生物炼制概念将 FW 转化为两种不同的产品，从而实现 LA 的经济可行生产并利用其发酵残渣的价值。最后，提出了三个不同方案的质量平衡，旨在评估在不同情况下可能产生的 LA 和沼气的量。
