Fatty acid metabolism and population dynamics in a wet biowaste digester during re-start after revision.
Fatty acid metabolism and population dynamics in a wet biowaste digester during re-start after revision.
复制标题
DOI：
10.1016/j.biortech.2014.05.085
复制
发表时间：
2014-08
影响因子：
11.4
通讯作者：
Christoph Moertelmaier;Chaoran Li;J. Winter;C. Gallert
中科院分区：
文献类型：
--
作者：
Christoph Moertelmaier;Chaoran Li;J. Winter;C. Gallert
研究了湿式厌氧消化器处理生物废弃物悬浮液过程中，挥发性脂肪酸（VFA）代谢和种群数量的变化。最初乙酸盐和丙酸盐积累。然而，VFA降解率在2周内得到改善，达到平衡的代谢与持续低VFA浓度。总的微生物种群由60%产酸+产乙酸和40%产甲烷细菌组成。丙酸盐氧化菌占总菌数的5.1%，其中以Pelotomaculum属的细菌占优势，其次为Smithellaspec和Smithellaspec。减少乙酸和丙酸积累和恢复后，whereasSyntrophobacterspec。在启动期间稳步增长。几乎恒定比例的Methanosaetaspec。一直都在，而甲烷却在。在乙酸盐和丙酸盐的积累和降解过程中，甲烷微生物数量增加，在稳态期间，获得与接种物中相同的比例。
Volatile fatty acid (VFA) metabolism and population changes during re-start of a wet anaerobic digester for treatment of biowaste suspensions were investigated. Initially acetate and propionate accumulated. However, VFA degradation rates improved within 2 weeks, reaching a balanced metabolism with constantly low VFA concentrations. The total microbial population consisted of 60% acidogenic + acetogenic and 40% methanogenic bacteria. Maximally 5.1% of all bacteria in the digester were propionate-oxidizing bacteria.Pelotomaculumspecies were dominant, followed by much lower numbers ofSmithellaspecies andSyntrophobacterspecies.PelotomaculumandSmithellaspec. decreased during acetate and propionate accumulation and recovered later on, whereasSyntrophobacterspec. was steadily increasing during start-up. A nearly constant proportion ofMethanosaetaspec. was present all time, whileMethanosarcinaspec. decreased andMethanomicrobialesincreased during accumulation and degradation of acetate and propionate. During steady state proportions as in the inoculum were obtained.