Polyhydroxyalkanoates (PHA) are a family of microbial polyesters that are used as biodegradable plastics in replacement of conventional plastics for various applications. However, the high production cost is the barrier for PHA market expansion. This study aimed to utilize food waste as low-cost feedstock to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) by Haloferax mediterranei . The effects of acetate (Ac), propionate (Pr), butyrate (Bu), and the short-chain carboxylates derived from food waste were examined on the microbial growth and PHBV production. Results showed that a mixture of carboxylates provided a 55% higher PHBV yield than glucose. The food-waste-derived nutrients achieved the yields of 0.41 to 0.54 g PHBV/g Ac from initial loadings of 450 mg/L to 1800 mg/L Ac of total carboxylates. And the consumption of individual carboxylate varied between different compositions of the carbon source. The present study demonstrates the potential of using food waste as feedstock to produce PHBV by Haloferax mediterranei , which can provide economic benefits to the current PHA industry. Meanwhile, it will also help promote organic waste reduction in landfills and waste management in general.

中文翻译：

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Haloferax mediterranei 从食物垃圾衍生的营养素中生产聚羟基链烷酸酯 (PHA) 用于可生物降解塑料应用。

聚羟基脂肪酸酯 (PHA) 是一类微生物聚酯，用作可生物降解塑料，可替代传统塑料用于各种应用。然而，高生产成本是PHA市场扩张的障碍。本研究旨在利用食物垃圾作为低成本原料，通过Haloferax mediterranei生产聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）. 研究了乙酸盐 (Ac)、丙酸盐 (Pr)、丁酸盐 (Bu) 和来自食物垃圾的短链羧酸盐对微生物生长和 PHBV 产生的影响。结果表明，羧酸盐混合物提供的 PHBV 产量比葡萄糖高 55%。从 450 mg/L 到 1800 mg/L Ac 的总羧酸盐初始负载量，食物垃圾衍生的营养素的产量达到 0.41 到 0.54 g PHBV/g Ac。并且在碳源的不同组成之间，单个羧酸盐的消耗量不同。本研究证明了使用食物垃圾作为原料通过Haloferax mediterranei生产 PHBV 的潜力，可为当前的PHA行业提供经济效益。同时，它也将有助于促进垃圾填埋场减少有机废物和整体废物管理。