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《Journal of Northwest A & F University(Natural Science Edition)》 2012-05
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Effect of different pretreatments on biogas production characteristics of anaerobic fermentation of wheat straw

JI Yan-min1a,2,YANG Gai-he1b,2,YIN Dong-xue1a,2,LIU Juan-juan1b,2(1 a College of Forestry,b College of Agronomy,Northwest A&F University,Yangling,Shaanxi 712100,China; 2 Research Center of Agricultural Engineering and Technology of Shaanxi Province,Yangling,Shaanxi 712100,China)  
【Objective】 The study was to explore the effect of different biological and chemical pretreatments on biogas production of wheat straw by anaerobic fermentation to find a more effective pretreatment to improve energy conversion of straw.【Method】 A batch of experiments under the condition of 8% mass fraction of total solid were conducted in a self-manufactured anaerobic fermentation reactor,with wheat straw pretreated by biological methods(complex microbial agent,sugar fermentation enzyme and biogas slurry),and chemical methods(NaOH(amount:60 g/kg),and NH3·H2O(20 mL/L))as fermentation materials,and the untreated as control(CK),and the substrate of constant temperature fermentation pool as inoculation substance.The biogas production rate,biogas yield,and the change of methane content and pH value were determined at 35 ℃ and compared the biogas production index at different pretreatments,which included total solid(TS) gas yield,volatile solid(VS) gas yield and average methane content.【Result】 Every pretreatment could increase the gas production peak obviously,and shorten the time of peak appearance.The results showed that the biogas yield after different biological and chemical pretreatments was raised by 5.85%-48.16%,NaOH complex microbial agentsugar fermentation enzymebiogas slurryammoniaCK,the average content of methane improved by 15.06%-39.47% after different pretreatments.The total biogas production of wheat straw under NaOH pretreatment was 12 620 mL,which was 48.16%,39.47% higher than CK.In addition,the average methane content was 46.8% higher than CK.The pH value of all pretreatment decreased in initial stage,and increased in the next stage,then stabilized with anaerobic digestion carried on.The TS and VS gas yield of NaOH pretreatment were significantly higher than other pretreatments(P0.05).【Conclusion】 The method of wheat straw pretreated by NaOH(amount:60 g/kg) can improve biogas production effectively at 35 ℃.
【Fund】: 陕西省“13115”重大专项(2010ZDKG-06);; 农业部农村能源综合建设项目(2011-65);; “十二五”国家科技支撑计划项目“混合原料高产生物燃气技术集成示范”(2011BAD15B03)
【CateGory Index】: X712
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