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Dynamics of Clostridium genus and hard-cheese spoiling Clostridium species in anaerobic digesters treating agricultural biomass.
AMB Express ( IF 3.7 ) Pub Date : 2020-06-01 , DOI: 10.1186/s13568-020-01040-4
Alessandra Fontana 1 , Mariangela Soldano 2 , Paolo Bellassi 1 , Claudio Fabbri 2 , Francesco Gallucci 3 , Lorenzo Morelli 1, 4 , Fabrizio Cappa 1, 4
Affiliation  

Biogas plants are a widespread renewable energy technology. However, the use of digestate for agronomic purposes has often been a matter of concern. It is controversial whether biogas plants might harbor some pathogenic clostridial species, which represent a biological risk. Moreover, the inhabitance of Clostridium hard-cheese spoiling species in anaerobic digesters can be problematic for hard-cheese manufacturing industries, due to the issue of cheese blowing defects. This study investigated the effect of mesophilic anaerobic digestion processes on the Clostridium consortia distribution over time. Specifically, three lab-scale CSTRs treating agricultural biomass were characterized by considering both the whole microbial community and the cultivable clostridial spores. It is assessed an overall reduction of the Clostridium genus during the anaerobic digestion process. Moreover, it was evidenced a slight, but steady decrease of the cultivable clostridial spores, mainly represented by two pathogenic species, C. perfringens and C. bifermentans, and one hard-cheese spoiling species, C. butyricum. Thus, it is revealed an overall reduction of the clostridial population abundance after the mesophilic anaerobic digestion treatment of agricultural biomass.



中文翻译:

厌氧消化池中处理农业生物质的梭菌属和硬干酪腐败梭菌的动态。

沼气厂是一种广泛的可再生能源技术。然而,将消化物用于农艺目的经常是一个令人关注的问题。沼气厂是否可能藏有某些致病梭菌物种存在争议,这代表了生物风险。此外,由于干酪吹制缺陷的问题,厌氧消化池中梭菌硬奶酪变质物种的居住对于硬奶酪制造行业可能是个问题。这项研究调查了嗜温厌氧消化过程对梭菌的影响。财团随时间的分布。具体而言,通过考虑整个微生物群落和可培养的梭菌孢子来表征处理农业生物质的三个实验室规模的CSTR。评估了厌氧消化过程中梭菌属的总体减少。此外,已证明可培养的梭菌孢子轻微但稳定地减少,主要由两种致病菌种C代表。perfringensC. bifermentans,以及一种硬奶酪变质种C. butyricum。因此,揭示了农业生物质的中温厌氧消化处理后梭菌种群丰度的总体降低。

更新日期:2020-06-01
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