利用剩余活性污泥合成聚羟基脂肪酸酯的研究进展

Advances in synthesis of polyhydroxyalkanoates by using residual activated sludge

摘要:

利用单一微生物发酵是现阶段获得聚羟基脂肪酸酯 (PHA) 的主要方式，但过高的生产成本限制了其大规模应用。近年来利用活性污泥菌群混合培养合成PHA被广泛研究。将剩余污泥处理与PHA合成相结合，不仅可以省去纯培养所必需的灭菌环节，同时可以实现剩余污泥的资源化利用。剩余污泥的水解酸化、菌群富集驯化及PHA合成受环境因素影响，深入的生物合成机制研究有助于混合培养合成PHA的推广应用。文中主要介绍利用剩余污泥合成PHA的可行性、影响剩余污泥水解酸化的因素、污泥菌群富集驯化合成PHA及其机制等方面的研究进展。

Abstract:

Pure microbial fermentation is the primary means of polyhydroxyalkanoates (PHA) production at present, but high cost limits its large-scale application. In recent years, the synthesis of PHA by mixed microbial culture of activated sludge has been extensively studied. Combining the residual sludge treatment with PHA synthesis not only eliminates the sterilization process necessary for pure culture, but also utilizes residual sludge as resource. The hydrolysis and acidification of the residual sludge, the enrichment and acclimation of the consortium and the PHA synthesis are affected by environmental factors. The intensive biosynthesis mechanism study is helpful for the application of mixed culture to synthesize PHA. This paper introduces the feasibility of using residual sludge to synthesize PHA, the factors affecting the hydrolysis and acidification of residual sludge, the accumulation and domestication of PHA by sludge microbial consortium and its mechanism.