Bühlmann Christopher H, Mickan Bede S, Tait Stephan, Batstone Damien J, Bahri Parisa A
Discipline of Engineering and Energy, Murdoch University, Perth, WA, Australia.
School of Agriculture and Environment, The University of Western Australia, Perth, WA, Australia.
Front Bioeng Biotechnol. 2023 May 12;11:1177739. doi: 10.3389/fbioe.2023.1177739. eCollection 2023.
Low lactic acid (LA) yields from direct food waste (FW) fermentation restrict this production pathway. However, nitrogen and other nutrients within FW digestate, in combination with sucrose supplementation, may enhance LA production and improve feasibility of fermentation. Therefore, this work aimed to improve LA fermentation from FWs by supplementing nitrogen (0-400 mgN·L) as NHCl or digestate and dosing sucrose (0-150 g·L) as a low-cost carbohydrate. Overall, NHCl and digestate led to similar improvements in the rate of LA formation (0.03 ± 0.02 and 0.04 ± 0.02 h for NHCl and digestate, respectively), but NHCl also improved the final concentration, though effects varied between treatments (5.2 ± 4.6 g·L). While digestate altered the community composition and increased diversity, sucrose minimised community diversion from LA, promoted growth at all dosages, and enhanced the final LA concentration from 25 to 30 g·L to 59-68 g·L, depending on nitrogen dosage and source. Overall, the results highlighted the value of digestate as a nutrient source and sucrose as both community controller and means to enhance the LA concentration in future LA biorefinery concepts.
直接食物垃圾（FW）发酵产生的低乳酸（LA）产量限制了这种生产途径。然而，食物垃圾消化液中的氮和其他营养物质，与添加蔗糖相结合，可能会提高LA产量并改善发酵的可行性。因此，这项工作旨在通过添加氯化铵或消化液形式的氮（0 - 400 mgN·L）以及添加蔗糖（0 - 150 g·L）作为低成本碳水化合物来提高食物垃圾的LA发酵。总体而言，氯化铵和消化液在LA形成速率上带来了相似的提升（氯化铵和消化液分别为0.03 ± 0.02和0.04 ± 0.02 h⁻¹），但氯化铵也提高了最终浓度，尽管不同处理之间效果有所不同（5.2 ± 4.6 g·L）。虽然消化液改变了群落组成并增加了多样性，但蔗糖使群落偏离LA的程度最小化，在所有剂量下都促进了生长，并根据氮剂量和来源将最终LA浓度从25至30 g·L提高到59 - 68 g·L。总体而言，结果突出了消化液作为营养源的价值以及蔗糖作为群落控制剂和提高未来LA生物精炼概念中LA浓度手段的价值。
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