The inhibition of anaerobic digestion by model phenolic compounds representative of those from Sargassum muticum
The inhibition of anaerobic digestion by model phenolic compounds representative of those from Sargassum muticum
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DOI：
10.1007/s10811-018-1512-4
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发表时间：
2019-02-01
影响因子：
3.3
通讯作者：
Harvey, Patricia J.
中科院分区：
文献类型：
--
作者：
Milledge, John J.;Nielsen, Birthe V.;Harvey, Patricia J.
从大型藻类，特别是海马尾藻的厌氧消化的沼气的实际产量基本上低于理论最大值。关于海藻的实际甲烷产量相对较低的原因有相当多的推测，并且多酚被认为是褐色海藻的甲烷产量低的因素之一。然而，似乎很少有特定的酚类物质对确定的底物的影响的信息。本文研究了一些简单的酚类化合物的影响，这些酚类化合物是S. Muticum对一系列模型基质的甲烷生产的影响。选择三种简单的酚类物质，没食子酸，表儿茶素和间苯三酚;在四个添加水平，0，0.5，3.5和7.5%w/w的基板;对于四个基板，一个容易消化的简单的有机物质，甘油，和三个聚合物中发现的海藻，纤维素，海藻酸和海藻酸钠盐。发现海藻酸及其钠盐是不稳定的，平均甲烷产率仅相当于其理论甲烷潜力的23-28%。甲烷产量进一步降低的存在下，高浓度（7%的底物相当于17.5mgL（-1））的间苯三酚和表儿茶素。研究的酚类化合物似乎都不能抑制简单且易于消化的化合物甘油的分解。海藻中甲烷产率较低可能是由于厌氧消化初始水解阶段复杂水胶体的不稳定性和酚类物质对更复杂分子分解的抑制作用，但还需要进一步研究。
Practical yields of biogas from the anaerobic digestion of macroalgae and, Sargassum muticum in particular, are substantially below the theoretical maximum. There is considerable conjecture about the reasons for the relatively low practical methane yields from seaweed, and polyphenols are suggested as one of the elements in the low yield of methane from brown seaweeds. However, there appears to be little information on the effect of specific phenolics on defined substrates. This paper examines the effect of some simple phenolic compounds, representative of those reported in S. muticum on methane production from a range of model substrates. Three simple phenolics were selected, gallic acid, epicatechin and phloroglucinol; at four addition levels, 0, 0.5, 3.5 and 7.5% w/w of substrate; for four substrates, a readily digested simple organic substance, glycerol, and three polymers found in seaweed, cellulose, alginic acid and the sodium salt of alginic acid. Alginic acid and its sodium salt were found to be recalcitrant with average methane yields of equivalent to only 23-28% of their theoretical methane potential. Methane yield was further reduced by the presence of high concentrations (7% of substrate equivalent to 17.5mgL(-1)) of phloroglucinol and epicatechin. None of the phenolic compounds studied appeared to inhibit the breakdown of the simple and readily digested compound, glycerol. Low methane yield in seaweed may be due to the recalcitrance of complex hydrocolloids and phenolic inhibition of the breakdown of more complex molecules in the initial hydrolysis stage of anaerobic digestion, but further research is required.