摘要
为考察青贮秸秆与牛粪的混合厌氧发酵条件,文章研究了3种不同总固体浓度(10%,12%和14%)对二者中温发酵产沼气性能的影响,并用修正Gompertz模型对其产气过程进行动力学拟合。结果表明,总固体浓度为12%时的沼气产量和品质均高于另外2种固体浓度,该条件下的发酵液p H值,VFAs,COD和NH+4-N浓度变化有利于沼气发酵。用修正Gompertz模型能很好地拟合累积产甲烷量随时间的变化,拟合得到3个试验组的最大产甲烷速率分别为211.12,345.31和210.93 m L·d-1。说明TS 12%时的青贮玉米秸秆与牛粪混合发酵产沼气效果最佳。
This study aimed to investigate the optimum fermentation condition for combined digestion of maize stalk silage（ MSS） and cattle dung. Effects of different initial TS concentrations（ 10%,12% and 14%） on the anaerobic co-digestion were evaluated. The experiment was carried out in 1. 5 L batch digesters at temperature of 37℃ for 62 days. The methane production data were fitted with the modified Gompertz model to assess the characteristics of the anaerobic digestions. The results showed that the TS concentration of 12% had a better biogas production than the other two TS concentration. Moreover,the modified Gompertz equation could fit well the change of the accumulative methane production with the fermentation time. Parameters of maximum methane yield,methane production rate and lag period could be important evaluation index for the mixed fermentation. The fitting of modified Gompertz model showed that the maximum methane production rate were211. 12 m L·d-1,345. 31 m L·d-1and 210. 93 m L·d-1for initial TS concentration of 10%,12% and 14%,respectively. So,the anaerobic co-digestion of maize stalk silages and cattle dung was favored with TS of 12%.
出处
《中国沼气》
北大核心
2017年第1期29-34,共6页
China Biogas
基金
国家自然科学基金项目(51366009)
甘肃省自然科学基金项目(145RJZA064)
兰州市人才创新创业专项(2014-2-20)
关键词
青贮玉米秸
牛粪
混合发酵
总固体浓度
修正Gompertz模型
maize stalk silages（MSS）
cattle dung
anaerobic co-digestion
total solid concentration（TS）
modified Gompertz model
