摘要
以猪粪和酒糟为发酵原料,考察了5种混合比例(猪粪与酒糟总固体含量(TS)比100:0、95:5、90:10、80:20、50:50)下混合厌氧发酵的产甲烷特性,并研究了其三元pH缓冲体系特征。结果表明,混合比例显著影响猪粪与酒糟混合发酵的甲烷产率(P<0.05)。当猪粪与酒糟TS比为95:5时,甲烷产率最大(271 mL·g^(-1)(VSadded)),比纯猪粪厌氧发酵的甲烷产率提高了6.2%。纯猪粪、猪粪与酒糟TS比为95:5的2组累积产甲烷量符合修正Gompertz方程(R^2=0.993 3;R^2=0.989 6),无明显滞后期。酒糟含有的大量硫酸盐影响了甲烷产量。VFAs-氨氮-TIC三元pH缓冲体系特征的研究结果表明,由于酒糟的碱度严重缺失,酒糟添加量过大时,体系偏离合适的pH缓冲区域,体系酸度过高,抑制了厌氧发酵的进行。
The swine manure and distiller,s grains were used as fermentation raw materials. Batch experiments of anaerobic co-digestion were carried to investigate methane production potential at five mixing ratios（swine manure/distiller,s grains TS ratio 100：0, 95：5, 90：10, 80：20, 50：50）, and its characteristics of ternary pH buffer system were studied. The results indicated that mixing proportions of swine manure and distiller,s grains significantly affected the methane production per unit of VS. The highest unit VS methane yield occurred at the TS ratio proportion of 95：5, and methane yield was 271 mL·g^-1（VSadded）, 6.2% higher than that of swine manure.The cumulative methane production of two fermentation groups of manure, manure/distiller TS ratio of 95：5, fit with the modified Gompertz equation very well（R～2=0.993 3; R～2=0.989 6）, had no significant lag period. Due to distiller,s grains rich in sulfate, it affected the methane production. The results of VFAs-ammonia-TIC ternary pH buffer system showed that because of low alkalinity in the distiller,s grains, with increase of adding distiller,s grains,the pH of the system deviated from the proper pH buffer area resulting in an excessively high acidity of the system and delaying the anaerobic fermentation.
作者
王子月
张长平
孟晓山
张俊亚
王亚炜
魏源送
WANG Ziyue;ZHANG Changping;MENG Xiaoshan;ZHANG Junya;WANG Yawei;WEI Yuansong(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;School of Chemical and Environmental Engineering,China University of Mining and Technology（Beijing）,Beijing 100083,China;University of Chinese Academy of Sciences,Beijing 100055,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2018年第8期2379-2387,共9页
Chinese Journal of Environmental Engineering
基金
国家水体污染控制与治理科技重大专项(2015ZX07203-007,2017ZX07102)
关键词
猪粪
酒糟
厌氧发酵
甲烷
三元pH缓冲体系
swine manure
distiller＇s grains
anaerobic fermentation
methane
ternary pH buffer system
