Interaction between homoacetogens and methanogens in lake sediments

Jiunn-Jyi Lay , Yu-You Li , Tatsuya Noike
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引用次数: 44

Abstract

The interaction between homoacetogens and methanogens in lake sediments was investigated using hydrogen consumption as an indicator. Sediments samples were obtained from Lake Izunuma, Miyagi prefecture, Japan, a wintering place for migratory birds from Siberia. A batch experiment using H2CO2 as a substrate was conducted to determine the acetate generation and methane production potential of the sediments. Incubation for 4 d at 37°C gave the following stoichiometric equation: 88H2 + 39HCO3 + 22H+ → 17CH3COO + 5CH4 + 83H2O. The activities, νm, of hydrogen-utilizing homoacetogens and methanogens respectively ranged from 3.2 to 48 and from 1.8 to 3.2 mgCOD·gVSS−1·h−1. The population of hydrogen-utilizing homoacetogens was determined to be 2.6 × 108 MPN·gVSS−1, which was approximately two orders of magnitude higher than that of hydrogen-utilizing methanogens. The results suggest that homoacetogens in the sediments functioned not only as hydrogen consumers but also as major degraders of organic matter, forming acetate as the major reduction product.

湖泊沉积物中同质产氧菌与产甲烷菌的相互作用
以耗氢量为指标,研究了湖泊沉积物中同质产氧菌和产甲烷菌的相互作用。沉积物样本取自日本宫城县的出云沼湖,该湖是西伯利亚候鸟的越冬地。以H2CO2为底物进行了批量实验,以确定沉积物的醋酸生成和甲烷生成潜力。在37℃条件下孵育4 d,得到的化学计量方程为:88H2 + 39HCO3−+ 22H+→17CH3COO−+ 5CH4 + 83H2O。利用氢的均质产氢菌和产甲烷菌的活性νm分别在3.2 ~ 48和1.8 ~ 3.2 mgCOD·gVSS−1·h−1之间。利用氢的同质产氢菌的数量为2.6 × 108 MPN·gVSS−1,比利用氢的产甲烷菌的数量约高2个数量级。结果表明,沉积物中的同质醋酸菌不仅是氢的消耗者,而且是有机物的主要降解者,形成醋酸盐作为主要的还原产物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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