The development of biopolymers has raised issues about their recalcitrance in the environment. Their disposal is mainly carried out with the organic fraction of municipal solid waste (OFMSW) through thermophilic anaerobic digestion and aerobic composting, bioprocesses aimed at turning organic matter into biogas and compost. However, the effects of biopolymers on OFMSW treatment, on the final compost and on the microbial communities involved are partly unexplored. In this study, the OFMSW treatment was reproduced on a laboratory-scale respecting real plant conditions and testing the impacts of mixing polylactic acid (PLA) and starch-based bioplastic (SBB) separately. The dynamics of bacterial, archaeal and fungal communities during the process was screened by high-throughput sequencing (HTS) of phylogenetic amplicons. SBB showed a minor and heterogeneous microbial diversity between the anaerobic and aerobic phases. Contrariwise, PLA treatment resulted in wider and more diverse bacterial and fungal communities for the compost and the aerobic biofilm. Since the biodiversity in compost may play a crucial role in its stability and safety, the modulation of environmental microbial communities induced by higher concentrations of PLA in OFMSW treatment can pose relevant issues.

中文翻译：

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生物聚合物调节市政有机废物消化过程中的微生物群落。

生物聚合物的发展提出了有关其在环境中难降解的问题。它们的处置主要通过高温厌氧消化和好氧堆肥以及旨在将有机物转化为沼气和堆肥的生物过程，与城市固体废物的有机部分（OFMSW）一起进行。然而，生物聚合物对OFMSW处理，最终堆肥和所涉及的微生物群落的影响尚待部分研究。在这项研究中，OFMSW处理在实验室规模上重现了真实的植物条件，并分别测试了混合聚乳酸（PLA）和淀粉基生物塑料（SBB）的影响。通过系统发育扩增子的高通量测序（HTS）筛选该过程中细菌，古细菌和真菌群落的动力学。SBB在厌氧和好氧阶段之间表现出较小的异质微生物多样性。相反，PLA处理导致堆肥和好氧生物膜的细菌和真菌群落更广泛，更多样化。由于堆肥中的生物多样性可能对其稳定性和安全性起关键作用，因此在OFMSW处理中由较高的PLA浓度引起的环境微生物群落的调节可能会引起相关问题。