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作 者:宁静 朱葛夫[1] 吕楠 潘小芳[1] 汪涛 李俊杰 周铭典 Ning Jing;Zhu Gefu;Lv Nan;Pan Xiaofang;Wang Tao;Li Junjie;Zhou Mingdian(Key Laboratory of Urban Pollutant Conversion,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China;University of Chinese Academy of Sciences,Beijing 100049,China)
机构地区:[1]中国科学院城市环境研究所,中国科学院城市污染物转化重点实验室,厦门361021 [2]中国科学院大学,北京100049
出 处:《农业工程学报》2018年第B11期93-98,共6页Transactions of the Chinese Society of Agricultural Engineering
基 金:国家重点研发计划项目(2017YFD0800804-03,2018YFD0500202-04);国家自然科学基金项目(21477122,51678553,51808525,21876167);福建省自然科学基金项目(2016J01273,2017J05092)。
摘 要:厌氧共消化是解决当前单一农业生物质废弃物厌氧消化过程中因碳氮元素比例不平衡而造成系统产能不高的问题的有效途径。该研究以猪粪和玉米秸秆为底物在连续搅拌厌氧消化反应器中进行中温厌氧共消化联产气肥,调控底物C/N分别为13.45(完全以猪粪为底物)、20、25、30、35和300(完全以玉米秸秆为底物),考察了底物C/N对工艺性能的影响。试验结果表明,当底物C/N为25时,厌氧共消化反应系统运行稳定,气肥联产性能最优,其中比产气率、甲烷体积分数和总养分质量浓度分别为514.75 mL/(g·d)、64.01%和660.26 mg/L。该研究为开发农业生物质废弃物高效发酵气肥联产工艺提供了技术参数和实践指导。Anaerobic co-digestion is an effective technology to solve the limitation of low biogas production from single substrate anaerobic digestion of agricultural biomass waste,owing to its inappropriate ratio of carbon to nitrogen.It is acknowledged that C/N ratio is one of the most important factors affecting the performance of anaerobic digester.Previous studies showed that the optimum range of C/N is 20-30 on anaerobic co-digestion.However,most of the literatures only investigated the effect of C/N ratio on biogas production and few studies focused on production performance of both biogas and slurry during anaerobic co-digestion process.Thus,this study explored the effect of C/N ratio on anaerobic co-digestion of pig manure and corn straw,taking both biogas production rate and nutrient content of slurry into consideration.A semi-continuous experiment was performed in a continuous stirred tank reactor(CSTR)with a working volume of 8 L under mesophilic temperature condition(37±1℃).Anaerobic co-digestion was operated at C/N ratio of 13.45(pig manure as sole feedstock),20,25,30,35 and 300(corn straw as sole feedstock).The results showed that anaerobic co-digestion system was seriously inhibited by the accumulation of volatile fatty when the C/N ratio of feedstock was 300 corn straw as sole feedstock.In addition,specific biogas production rates and total nutrient concentration of slurry were also very low,with the values of 46.00 mL/(g·d)and 518.92 mg/L,respectively.Whereas,CSTR system was stable and achieved a relative higher specific biogas production rates and slurry concentration at the C/N ratio of 13.45(pig manure as sole feedstock),20,25,30 and 35 than at the C/N ration of 300,in which the specific biogas production rates were 493.0,438.81,514.75,485.32 and 467.88 mL/(g·d)and CH4 content were 67.30%,63.99%,63.31%,59.96%and 57.40%,respectively.Compared with corn straw and pig manure as sole feedstock,specific biogas production rates were increased by 26.45%,80.63%,99.38%and 120.25%on anaerobic co-digestion sy
分 类 号:X71[环境科学与工程—环境工程]
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