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基于PEG/DEX双水相体系的餐厨垃圾乳酸发酵

Keywords: 双水相,餐厨垃圾,乳酸,发酵

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Abstract:

利用聚乙二醇(PEG)/葡聚糖(DEX)双水相体系分离餐厨垃圾发酵产物乳酸,分析了聚合物浓度和分子量的影响,以及餐厨垃圾多批次连续发酵时乳酸产率。实验结果表明,PEG/DEX双水相体系对乳酸菌生长影响不大,PEG和DEX浓度变化对乳酸产率、相体积比无显著影响;当DEX分子量由20000升至40000,乳酸生成速率由0.631g/(L·h)降至0.518g/(L·h),乳酸浓度由33g/L降至22g/L。多批次餐厨垃圾连续发酵可极大缩短发酵时间,在不投加缓冲剂的情况下,单批次乳酸产率仍大于0.30g/g,累积产率大于0.45g/g。

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