摘要
鉴于温度对产甲烷过程稳定运行的重要性,采用间歇培养方式研究了产甲烷过程受温度降低的影响,以及初始碳源对温度降低后产甲烷效能的影响.结果表明,产甲烷菌在25℃条件下,产甲烷效能有不同程度的下降,累计产甲烷量降低了25.2%,比产甲烷速率降低了21.1%,底物利用率都降低了15%左右.产甲烷菌在初始甲酸钠体积分数5%~40%、乙酸钠浓度0.5~4.0 mol/L和甲醇体积分数35%~70%时都可以产甲烷,其累计产甲烷量随着底物含量的增大而先增大后减小.在甲酸钠体积分数30%和乙酸钠浓度3 mol/L时,累计产甲烷量达到最大,分别为2.75、2.84 L/L,累计产甲烷量分别提高了12.2%和15.9%.不同体积分数甲醇对其产甲烷量提高效果不明显,产甲烷效能与原来持平.
This paper studied the effect of lower temperature and initial substrate concentra- tions on methane production by methanogens at 25 ℃ and sodium concentrations 5% - 40%, sodium acetate concentrations 0.5 -4.0 mol/L, methanol concentration was 35% 70%. The cumulative methane volume decreased 25.2% , specific methane production rate decreased 21.1%, substrate utilization rate lower about 15%. The cumulative hydrogen vol- ume and biomass increased and then decreased with increasing initial substrate concentra- tions. At sodium concentrations 30% and sodium acetate concentrations 3 mol/L, the cumulative methane production reached the maximum value of 2.75 L/L and 2.84 L/L, decreased 12.2% and 15.9% respectively. The effect of different concentrations of methanol ruas not obvious.
出处
《哈尔滨商业大学学报(自然科学版)》
CAS
2012年第2期175-178,182,共5页
Journal of Harbin University of Commerce:Natural Sciences Edition
基金
国家高技术研究发展计划(863计划)资助项目(2009AA064702)
关键词
温度降低
甲酸钠体积分数
乙酸钠浓度
累计产甲烷量
temperature decreasing
sodium concentration
sodium acetate concentration
cumulative methane volume