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首页> 外文期刊>Journal of Polymers and the Environment >High-Efficiency Production of Bioplastics from Biodegradable Organic Solids
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High-Efficiency Production of Bioplastics from Biodegradable Organic Solids

机译：由可生物降解的有机固体高效生产生物塑料

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Microbial polyhydroxyalkanoates (PHAs) have been extensively studied as environmentally friendly biodegradable thermoplastics. The major obstacle to wide acceptance of PHAs is their high price, mainly attributed to the costs of raw materials and polymer recovery. A large amount of organic solids are discarded from food production and consumption and may be used as carbonaceous raw materials for production of PHAs. A novel technology was investigated at bench-top scale to produce PHAs from food scraps. The harvested cell mass had a high PHA content (72.6% of dry cell mass), the same as obtained from pure glucose and organic acids. The organic solid was first digested in an acidogenic reactor in which about 60% solid was converted to fermentative "products, including short-chain fatty acids. The four major acids were acetic, propionic, butyric, and lactic acids at concentrations of 6, 2, 27, and 33 g/L, respectively. The acids were transported through a membrane barrier via molecular diffusion to an airlift bioreactor, where the acids were utilized by an enriched culture of Ralstonia eutropha for PHA synthesis. Purification of fermentative acids was not performed in this molecular diffusion-based integration of acidogenesis and polymerization. By using a dialysis membrane as the barrier, the dry cell mass concentration and PHA content reached 22.7 g/L and 72.6%, respectively. The PHA was a copolymer of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with 2.8 mole % of hydroxyvalerate.
机译：微生物聚羟基链烷酸酯（PHA）已被广泛研究为环境友好的可生物降解的热塑性塑料。广泛接受PHAs的主要障碍是其价格高昂，这主要归因于原材料成本和聚合物回收。食品生产和消费中会丢弃大量有机固体，这些有机固体可用作生产PHAs的碳质原料。在台式规模上研究了一种新技术，可以从食物残渣中生产PHA。收获的细胞团具有高的PHA含量（干细胞团的72.6％），与从纯葡萄糖和有机酸获得的相同。首先在产酸反应器中消化有机固体，其中约60％的固体转化为发酵产物，包括短链脂肪酸。四种主要酸是乙酸，丙酸，丁酸和乳酸，其浓度分别为6、2分别以27 g / L和33 g / L的浓度通过分子扩散将其通过膜屏障转运到空运生物反应器中，在此通过富营养的富营养性Ralstonia eutropha进行PHA合成，而未进行发酵酸的纯化在这种基于分子扩散的酸生成和聚合反应的集成中，以透析膜为屏障，干细胞质量浓度和PHA含量分别达到22.7 g / L和72.6％。PHA是聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）与2.8摩尔％的羟基戊酸酯。

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