摘要
由于丙酸积累而造成的酸败问题一直是制约厌氧反应器稳定运行的重要因素之一。试验通过人为添加硫酸盐的方法,研究了硫酸盐还原作用在厌氧过程中对丙酸转化的影响。试验的结果表明,硫酸盐的添加促进了厌氧反应器中丙酸降解的速率,减少了丙酸对产甲烷细菌的抑制作用,从而提高了反应器COD去除率;DGGE图谱显示添加硫酸盐体系中产甲烷菌种群结构发生了变化,优势种群发生了转移。认为硫酸盐还原菌对厌氧反应器中丙酸的降解会产生促进作用,因此可以通过调节硫酸盐还原菌、产酸菌和产甲烷菌之间的协同作用来维持厌氧反应器稳定运行。
As a result of propionic acid accumulation, rancidity is one of important factors that restrict stable operation of anaerobic reactor. Effects of sulfate reduction on transformation of proionic acid in anaerobic process were studied by adding sulfate. Results showed that adding sulfate can promote conversion rate of propionic acid in anaerobic reactor and decrease the inhibition of methanogenic bacteria by propionic acid, consequently enhance removal rate of COD. DGGE map shows there is a change of methanogenic bacteria communities in the adding sulfate system, simultaneously the dominant community has a transformation. Sulfate reducing bacteria has a stimulative action on transformation of propionic acid in anaerobic reactor. Cooperation among sulfate reducing bacteria, acid producing bacteria and methanogenic bacteria can be adjusted to maintain stability of anaerobic reactor.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2009年第5期40-44,共5页
Environmental Science & Technology
基金
国家自然科学基金项目资助(50308011)
江苏省环保科技项目资助(2007023)
关键词
厌氧消化
丙酸积累
硫酸盐还原菌
anaerobic digestion
propionic acid accumulation
sulfate reducing bacteria
