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《Transactions of the Chinese Society of Agricultural Engineering》 2009-02
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Effects of ratios of manure and straw,urea and cellulose on biogas yields at different temperatures

Bai Jierui 1,2 ,Li Yibing 1,2 ,Guo Ouyan 2,3 ,Yang Gaihe 1,2 ,Ren Guangxin 1,2 ,Feng Yongzhong 1,2 ,Li Yong (1.College of Agronomy,Northwest Agriculture and Forestry University,Yangling 712100,China; 2.Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province,Yangling 712100,China; 3.College of Resources and Environment,Northwest Agriculture and Forestry University,Yangling 712100,China; 4.Jintan City Agriculture and Forestry Bureau,Jintan 213200,China)  
How to increase biogas yield and improve the utilization efficiency of crop residues and other agricultural wastes is a major problem in modern circular agricultural field.A simulation experiment using self-designed constant-temperature anaerobic fermentation equipment was conducted in indoor conditions.Effects of different ratios of chicken manure to crop residues under different temperature on the gas production were studied.The effect of adding urea and cellulose to biogas digester was also investigated.The crop residues included rice straw,wheat straw and corn straw.Results showed that the biogas production of each treatment rose with the increase of temperature in the range of 20~35℃.The highest yield wasobserved when the ratio of chicken manure to straw(dry matter quantity)was 2︰1 at 35℃,among whichthe ratio of chicken manure to corn straw at 2:1 had the maximal yield,up to 51120 mL in 50 days and the fermentation material was 2.5 kg.Both adding urea(2.5 g)and cellulose(2 g)into 2.5 kg fermentation material could significantly increase yields in the middle of fermentation,after fermentation for 28 days,the average increment was 99.8%and 40.8%,respectively.Compared with other groups,the group with the ratio of chicken manure to wheat straw at 2:1 had the highest increasing range,that is,261.2%and 117.3%,respectively.Dynamic changes of the pH value were found at 20℃,with average pH value 6.8 at earlier fermentation stage,6.4 at middle stage,then it slowly rose to 6.6.Therefore,suitable temperature,reasonable ratio of manure to straw as well as adding proper amount of urea and cellulose can effectively improve the biogas yield.
【Fund】: 国家自然科学基金(30700482);; 陕西省自然科学基础研究计划项目(2007C103);; 西北农林科技大学生物质能源研究专项(07ZR050)
【CateGory Index】: S216.4
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