Biomass hydrolysis inhibition at high hydrogen partial pressure in solid-state anaerobic digestion
Biomass hydrolysis inhibition at high hydrogen partial pressure in solid-state anaerobic digestion
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DOI：
10.1016/j.biortech.2015.04.055
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发表时间：
2015-08-01
影响因子：
11.4
通讯作者：
Escudie, R.
中科院分区：
文献类型：
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作者：
Cazier, E. A.;Trably, E.;Escudie, R.
在固态厌氧消化（所谓的ss-AD）中，生物气产生在高总固体含量下被抑制。这种抑制可能是由局部积累的溶解的反应中间体的缓慢扩散引起的。在这项研究中，我们研究了H-2和CO2分压对ss-AD的影响。人为固定H-2和/或CO2的分压，H-2的分压为0至1557 mbar，CO2的分压为0至427 mbar。高的H-2分压对甲烷生成有显著影响，而CO2分压对甲烷生成没有影响。在高P-H2下，总体底物降解降低，没有产酸细菌代谢产物的积累，表明水解活性受到特定影响。有趣的是，当CO2与H-2一起加入时，没有发生这种抑制。这一结果表明，CO2气体转移可能是生物质ss-AD的关键因素。(C)2015爱思唯尔有限公司版权所有。
In solid-state anaerobic digestion, so-called ss-AD, biogas production is inhibited at high total solids contents. Such inhibition is likely caused by a slow diffusion of dissolved reaction intermediates that locally accumulate. In this study, we investigated the effect of H-2 and CO2 partial pressure on ss-AD. Partial pressure of H-2 and/or CO2 was artificially fixed, from 0 to 1 557 mbars for H-2 and from 0 to 427 mbars for CO2. High partial pressure of H-2 showed a significant effect on methanogenesis, while CO2 had no impact. At high P-H2, the overall substrate degradation decreased with no accumulation of metabolites from acidogenic bacteria, indicating that the hydrolytic activity was specifically impacted. Interestingly, such inhibition did not occur when CO2 was added with H-2. This result suggests that CO2 gas transfer is probably a key factor in ss-AD from biomass. (C) 2015 Elsevier Ltd. All rights reserved.