Department of Science and Engineering of Materials, Environment and Urban Planning - SIMAU, Università Politecnica delle Marche, INSTM Research Unit, Via Brecce Bianche 12, 60131 Ancona, Italy.
Department of Science and Engineering of Materials, Environment and Urban Planning - SIMAU, Università Politecnica delle Marche, INSTM Research Unit, Via Brecce Bianche 12, 60131 Ancona, Italy; Institute of Atmospheric Sciences and Climate, National Research Council (ISAC-CNR), Bologna 40129, Italy.
Sci Total Environ. 2021 Dec 20;801:149633. doi: 10.1016/j.scitotenv.2021.149633. Epub 2021 Aug 13.
The paper deals with effects of two different widespread extraction methods (conventional extraction and Soxhlet extraction) and four different pre-treatments (homogenization with pressure and with blades, sonication, and impact with glass spheres) on the extraction yields and properties of polyhydroxyalkanoate (PHA) extracted from biomass coming from an innovative process (short-cut enhanced phosphorus and PHA recovery) applied in a real wastewater treatment plant. The results show that the two different extraction processes affected the crystallization degree and the chemical composition of the polymer. On the other hand, the extractive yield was highly influenced by pre-treatments: homogenization provided a 15% more extractive yield than the others. Homogenization, especially at high pressure, proved to be the best pre-treatment also in terms of the purity, visual appearance (transparency and clearness), thermal stability, and mechanical performances of the obtained PHA films. All the PHA films begin to melt long before their degradation temperature (Td > 200 °C): this allows their use in the fields of extrusion or compression moulding. SYNOPSIS: Optimizing the extraction of PHAs from municipal wastewater gives a double beneficial environmental impact: wastewater treatment and circular bio-based carbon upgrade to biopolymers for the production of bioplastics and other intersectoral applications.
本文研究了两种不同的广泛应用的提取方法（常规提取和索氏提取）以及四种不同的预处理方法（压力均质和刀片均质、超声处理和玻璃珠冲击）对从创新工艺（短程强化除磷和 PHAs 回收）应用于实际污水处理厂的生物质中提取的聚羟基烷酸（PHA）的提取产率和性能的影响。结果表明，两种不同的提取工艺影响了聚合物的结晶度和化学组成。另一方面，提取产率受预处理方法的影响很大：与其他方法相比，均质化可提高 15%的提取产率。均质化，尤其是在高压下，在获得的 PHA 薄膜的纯度、外观（透明度和清晰度）、热稳定性和机械性能方面被证明是最好的预处理方法。所有 PHA 薄膜在其降解温度（Td＞200°C）之前很早就开始熔融：这允许它们在挤出或压缩成型等领域使用。摘要：优化从城市废水中提取 PHAs 对环境具有双重有益影响：废水处理和循环生物基碳升级为生物聚合物，用于生产生物塑料和其他跨部门应用。
