Abstract
l-lactic acid fermentation coupled with MgO recycling was investigated. Factors affecting yield in MgCl2 pyrolysis were optimized by Box-Behnken design with a conversion rate of 97.35%, and recycled MgO was characterized by TG-DSC and XRD analyses. Specific surface area and average pore size of the recycled MgO were increased by 21.18% and 37.74%, respectively, and the mean particle size of the recycled MgO (6696.7 nm) was smaller than that of the pure MgO (7086.7 nm). The spontaneously formed honeycomb structure which could promote l-lactic acid fermentation was demonstrated, and MgO was recycled for 5 times providing stable titer (141.21–144.25 g/L), yield (94.51–95.26%) and productivity (2.03–2.09 g/L/h) with high cell viability (109.55 CFU/mL). Influence of the recyclable MgO on Lactobacillus rhamnosus LA-04-1 (L. rhamnosus LA-04-1) was further revealed, and 62 related genes involved in 13 key pathways were located by transcriptome analysis. This study provides a potential way for environmental-friendly production of l-lactic acid by decreasing waste discharge and energy consumption.
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