Environmental Science Program, University of Idaho, Moscow, ID 83844-3006, United States.
Environmental Science Program, University of Idaho, Moscow, ID 83844-3006, United States; Renewable Materials Program, Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID 8323844-1132, United States.
Waste Manag. 2015 Nov;45:51-6. doi: 10.1016/j.wasman.2015.02.004. Epub 2015 Feb 21.
Lactic acid (LA) is a necessary industrial feedstock for producing the bioplastic, polylactic acid (PLA), which is currently produced by pure culture fermentation of food carbohydrates. This work presents an alternative to produce LA from potato peel waste (PPW) by anaerobic fermentation in a sequencing batch reactor (SBR) inoculated with undefined mixed culture from a municipal wastewater treatment plant. A statistical design of experiments approach was employed using set of 0.8L SBRs using gelatinized PPW at a solids content range from 30 to 50 g L(-1), solids retention time of 2-4 days for yield and productivity optimization. The maximum LA production yield of 0.25 g g(-1) PPW and highest productivity of 125 mg g(-1) d(-1) were achieved. A scale-up SBR trial using neat gelatinized PPW (at 80 g L(-1) solids content) at the 3 L scale was employed and the highest LA yield of 0.14 g g(-1) PPW and a productivity of 138 mg g(-1) d(-1) were achieved with a 1 d SRT.
乳酸（LA）是生产生物塑料聚乳酸（PLA）的必要工业原料，目前 PLA 是通过纯培养发酵食品碳水化合物生产的。本工作提出了一种替代方法，即在市政污水处理厂未定义混合培养物接种的序批式反应器（SBR）中，利用马铃薯皮废物（PPW）进行厌氧发酵生产 LA。采用一套 0.8L 的 SBR 系统，采用 30-50 g L(-1) 的胶凝 PPW 固体含量范围、2-4 天的固体保留时间，采用实验设计方法对产量和生产效率进行优化。获得了最大的 LA 生产产率为 0.25 g g(-1) PPW 和最高的 125 mg g(-1) d(-1)生产率。采用 3L 规模的纯胶凝 PPW（80 g L(-1) 固体含量）进行了扩大规模的 SBR 试验，获得了最大的 LA 产率为 0.14 g g(-1) PPW 和 138 mg g(-1) d(-1)的生产率，SRT 为 1 天。
