摘要
在室温为20℃的实验室条件下,对牛粪进行了批量式高浓度厌氧发酵,采用二次正交旋转组合设计试验方法,探讨了牛粪水解酸化过程中,温度、料液浓度和停留时间对丙酸含量的影响规律。温度、料液浓度和停留时间的取值范围分别为25～35℃、6%～10%和2～12d,利用单因素分析法确定各因素在二次非线性模型中的主次顺序,利用频数分析找出各因素的最佳试验范围。试验分析结果表明,停留时间对丙酸含量的影响最大,温度次之,料液浓度的影响最小。通过频数分析,得出当温度为30～33℃,料液浓度为8%～10%,停留时间为10～12d时挥发酸中的丙酸含量均高于23%;当温度为25～31℃、料液浓度为7%～9%、停留时间为2～8d时挥发酸中的丙酸含量均低于19%。
High-concentration anaerobic fermentation of cow manure was investigated using an anaerobic batch reactors under laboratory conditions at 20℃. The content of propionic acid was used as response function, and three factors, temperature, the liquor concentration and retention time, were selected as input variables in the process of hydrolysis and acidogenesis of cow manure using a central composite rotation orthogonal experimental design. The temperature, liquor concentration and retention time were 25-35 ℃, 6%～10% and 2-12 d respectively. In the two-time nonlinear model, the principal and secondary order of every parameter was analyzed with single-parameter method. The optimal experimental extent of every parameter was determined through frequency analysis. The results showed that the content of propionic acid was greatly influenced by retention time, the temperature was second to it, and the liquor concentration was the least. The content of propionic acid in volatile acid was more than 23% at 30～33 ℃, the liquor concentration 8%～10% and the retention time 10～12 d, while, it was less than 19% at 25～31 ℃, the liquor concentration 7%～9% and the retention time 2～8 d.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第1期363-367,共5页
Journal of Agro-Environment Science
基金
国家自然科学基金(50376009)
黑龙江省科技攻关(GC03A304
GB06B502)
国家十一五科技支撑项目(2006BAD07A10)
关键词
牛粪
高浓度
水解酸化
丙酸含量
cow manure
high concentration
hydrolysis and acidogenesis
propionic acid content
