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In situ volatile fatty acids influence biogas generation from kitchen wastes by anaerobic digestion

机译:原位挥发性脂肪酸通过厌氧消化影响厨房废物产生沼气

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摘要

Anaerobic digestion is considered to be an efficient way of disposing kitchen wastes, which can not only reduce waste amounts, but also produce biogas. However, the excessive accumulation of volatile fatty acids (VFA) caused by high organic loads will inhibit anaerobic digestion intensively. Effects of the VFA composition on biogas generation and microbial community are still required for the investigation under various organic loads of kitchen wastes. Our results showed that the maximum specific methane production was 328.3 ml g TS~(-1), and acetic acid was the main inhibitor in methanogenesis. With the increase of organic load, aceticlastic methanogenesis was more sensitive to acetic acid than hydrogenotrophic methanogenesis. Meanwhile, methanogenic microbial community changed significantly, and few species grew well under excessive organic loads. This study provides an attempt to reveal the mechanism of VFA inhibition in anaerobic digestion of kitchen wastes.
机译:厌氧消化被认为是处理厨余的有效方法,不仅可以减少厨余,而且可以产生沼气。但是,由高有机负荷引起的挥发性脂肪酸(VFA)的过度积累会强烈抑制厌氧消化。在各种厨房废物有机负荷下,仍需要VFA成分对沼气产生和微生物群落的影响。我们的结果表明,最大比甲烷产量为328.3 ml g TS〜(-1),而乙酸是甲烷生成的主要抑制剂。随着有机负荷的增加,与氢营养型甲烷生成作用相比,乙腈的甲烷生成作用对乙酸更敏感。同时,产甲烷菌的微生物群落发生了显着变化,在过量有机负荷下很少有物种生长良好。这项研究提供了一个尝试,以揭示VFA抑制厨房废物厌氧消化中的机制。

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