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Effectiveness of enriched microbial culture under mesophilic and thermophilic condition in palm oil mill effluent for anaerobic digestion of Brachiaria mutica
Biofuels ( IF 2.1 ) Pub Date : 2019-11-04 , DOI: 10.1080/17597269.2019.1685784
Sasikarn Nuchdang 1 , Maneerat Khemkhao 2 , Vichai Domrongpokkaphan 3, 4 , Chantaraporn Phalakornkule 3, 5
Affiliation  

Abstract

In this study, we investigated the effectiveness of microbial enrichment in enhancing the anaerobic digestion of lignocellulosic biomass of anaerobically digested sewage sludge in a complex substrate under both mesophilic (305 K) and thermophilic (328 K) conditions. Palm oil mill effluent (POME) was used as the enrichment culture, and Brachiaria mutica (paragrass) as a representative of a lignocellulosic biomass with relatively low lignin content (ca. 10 wt%). The microbial enrichment was found to increase the hydrolytic activities of the sludge more than twofold, and to increase the bacterial diversity, especially under the mesophilic condition. The microbial enrichment was also found to increase the diversity of methanogenic archaea and the methanogenic activities of the sludge. When compared with the original sludge, the enriched microbial culture under the mesophilic condition increased the methane yield from 275 to 312 cm3 STP/g VS added. However, despite increased hydrolytic, acetogenic and methanogenic activities, the enriched microbial culture under the thermophilic condition failed to enhance methane production in a long-term anaerobic digestion of paragrass.



中文翻译:

棕榈油厂废水中温和高温条件下富集微生物培养对 Brachiaria mutica 厌氧消化的有效性

摘要

在这项研究中,我们研究了微生物富集在中温(305 K)和嗜热(328 K)条件下增强复杂基质中厌氧消化的污水污泥的木质纤维素生物质的厌氧消化的有效性。棕榈油厂废水 (POME) 用作富集培养物,而Brachiaria mutica(paragrass)作为具有相对低木质素含量(约 10 wt%)的木质纤维素生物质的代表。发现微生物富集使污泥的水解活性增加了两倍以上,并增加了细菌的多样性,尤其是在中温条件下。还发现微生物富集增加了产甲烷古菌的多样性和污泥的产甲烷活性。与原始污泥相比,在中温条件下富集的微生物培养使甲烷产量从 275 cm 3 提高到 312 cm 3添加了 STP/g VS。然而,尽管水解、产乙酸和产甲烷活性增加,但在高温条件下富集的微生物培养物未能提高副草长期厌氧消化过程中的甲烷产量。

更新日期:2019-11-04
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