Study Of Anaerobic Fermentative Hydrogen-Rich Biogas Production From Straw Mixed With Dung

With straw biomass,such as livestock and poultry dung as raw material,on the basis of the biomass fermentation technology research,not only to improve the environment pollution,but also can get other available energy.Anaerobic fermentation technology plays an important role in the development of renewable energy,such as methane,hydrogen and other renewable energy sources.Hydrogen,as a product of anaerobic fermentation process,is a kind of ideal alternative energy sources.Compared with other conventional energy fuels,hydrogen has advantages of high energy density,thermal conversion rate higher.By controlling the biogas fermentation process conditions,to improve the preparation of hydrogen content in biogas anaerobic fermentation,in order to gain high combustion value of biomass gas this line of thinking,has important significance to waste resource utilization efficiency maximization.The paper is finished with the support of national nonprofit industry(agriculture)research projects “The study of combination equipment and technology about biogas widely replace household energy goods”(project number :201303099).The process conditions of the early stage of the biogas fermentation control,analysis of biogas fermentation within 10 days of the early gas,inoculation amount of study,the factors such as initial p H value and the relationship between gas production and the hydrogen content.On the basis of single factor experiment,using response surface method to optimization fermentation conditions of hydrogen-rich biogas production from mixture of corn straw and cow dung.The results showed that:(1)the initial p H value of 7.5 of the experimental group to maintain normal p H anaerobic fermentation ability obviously better than other group;From the fermentation cycle the accumulative total volume,initial p H value of 7.5 experimental gas effect is better at 10.1 L,significantly higher than the other group;Compare from the accumulated hydrogen gas production,under the condition of the initial p H value of 7.5,the highest cumulative total volume,the fermentation process and the accumulation of hydrogen gas production rate is 132 ml,is 1.5 times of the initial p H value of 7.As a result,the initial p H value of 7.5 to improve the processing of corn stalk of hydrogen content in the raw materials mixed with cow dung biogas.(2)Inoculation amount to 35% of the group's ability to maintain anaerobic fermentation normal p H value obviously better than other group;The accumulative total volume from the fermentation cycle,35% inoculated quantity of experimental gas effect is better at 10.6 L,significantly higher than the other group;Comparison from the accumulated hydrogen gas production,35% inoculated quantity condition,the highest cumulative total volume,the fermentation process and the accumulation of hydrogen gas production rate of 141 ml.As a result,35% of the quantity of corn straw is enhanced with cow muck mixing of hydrogen content in the raw materials for biogas fermentation.(3)Experimental group with carbon and nitrogen ratio of 20:1 to maintain the ability of anaerobic fermentation normal p H value obviously better than other group;The accumulative total volume from the fermentation cycle,carbon and nitrogen than systematically experimental gas effect is better at 11.8 L,significantly higher than the other group;Comparison,from the accumulated hydrogen gas production under the condition of carbon and nitrogen ratio systematically,the accumulation of the fermentation process of hydrogen gas production rate is 129 ml,comprehensive consideration,the experimental group on the influence of hydrogen content in the gas changes is significant.Therefore,the experimental group with carbon and nitrogen ratio of 20:1 to improve the processing of corn stalk of hydrogen content in the raw materials mixed with cow dung biogas fermentation.(4)Response surface model of corn straw and cow dung mixed feedstock gas production test has good simulation results,according to the model predicting hydrogen cumulative gas production maximum value at the experimental conditions,150.55 m L: initial p H 7.48,inoculation amount 35.54%,carbon nitrogen ratio was 20.69.Based on the experimental conditions of corn straw and cow dung mixed fermentation tests to obtain hydrogen cumulative gas production 142.16 m L error 5.57%.