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China's large rural population, shortage of energy, to vigorously develop biogas can not only priority use of renewable energy, and improve the ecological environment in rural areas, with significant energy, economic, ecological and environmental benefits. In this study, fermentation material liquid pH value trends by comparing the effect of different mixture of manure and corn stalks anaerobic fermentation gas production under different temperature conditions and the entire reaction process, the combination of temperature, raw materials, ratio and pH value system the optimum mix of the different mixing of raw materials under different temperature conditions, in order to come to provide a theoretical basis for the rural household biogas digesters anaerobic fermentation produces biogas proportion of election materials and ingredients. The test by their own design a controllable thermostat fermentation device, corn straw pretreated corn straw and animal manure (chicken manure, pig manure, cow dung) as raw materials for biogas fermentation, chicken manure, pig manure and cow dung press dry biomass 3:1,2:1,1:1,1:2 ratio ratio at 10 ℃ ~ 40 ℃ (5 ℃ to a temperature gradient) under the conditions of batch tests, three different species of dung stalk mixing raw materials of different proportions in different temperature conditions the effect of pH value of gas production trend, the test results by the SPSS regression analysis, the optimal regression equation obtained the optimum mix of different temperatures under different mixing raw materials and Estimated maximum cumulative gas production. This experiment draw the following conclusions: (1) under the conditions of 10 ° C to 40 ° C, from the ratio of raw materials, mixed fermentation of chicken manure and corn stalks, the maximum cumulative gas production at 10 ° C, 15 ° C and 40 ℃, respectively 3:1,1:2 and 3:1 test group in fecal stalk than other temperature test group in fecal stalk than 2:1; pig manure and corn stalks mixed fermentation, the maximum cumulative gas production fecal stalk ratio the 3:1 test group, other temperature in manure the stalk than 2:1 test group; cow manure and corn stalks mixed fermentation at 15 ℃, in accordance with the order of the temperature, the maximum cumulative gas production , respectively, appear in the dung stalk of than 1:1,3:1,1:2,1:2,1:1,1:2,3: in the test group. (2) cumulative gas production from the three kinds of mixed materials mixture of chicken manure and corn stalks in the 35 ℃ fecal stalk than 2:1 optimal 16865mL, the the 10 ℃ fecal stalk ratio 2:1 and 1:1 when a minimum of 310mL; pig manure and corn straw mixture at 35 ° C dung stalk optimal 2:1 when 15177mL, 10 ° C dung stalk ratio 3:1 minimum 205mL; cow manure and corn stalks mixture at 35 ° C fecal stalk ratio 1:2 optimal for 12973mL, 10 ° C dung stalk 2:1 minimum 280 mL. (3) three kinds of raw material mixture pH value at the beginning of fermentation is generally low, with the gas production rate increases, the tendency to increase as the reaction proceeds, the pH is basic rendering, maximum at pH began to decline, and in the entire dynamic changes of pH in the fermentation process. PH value throughout the reaction conditions of 10 ℃ ~ 20 ℃ changed little, three kinds of mixed materials under the conditions of 20 ° C. As the reaction proceeded slowly increased until the end of the gas production trends showing, 25 ℃ ~ 40 ℃ condition Next, the pH value change trend and the trend of the gas production rate is substantially similar. (4) using SPSS software on the conditions of 10 ℃ ~ 40 ℃ different proportions of chicken manure, pig manure and cow dung mixed fermentation with corn stalks cumulative gas production carried out on regression analysis, pig manure and corn stalks mixed: under the conditions of 10 ° C fermentation optimal ratio of 2.11:1, maximum cumulative gas production of 261mL; cow manure and corn stalks the mixed fermentation optimal ratio 3.28:1, the maximum cumulative gas production for 313mL. 15 ℃ under the conditions of mixed fermentation of pig manure and corn stalks optimal ratio of 1.35:1, the maximum cumulative gas production 1440mL. Under the conditions of 20 ° C., mixed fermentation of chicken manure and corn stalks optimal ratio of 2.23:1, the maximum cumulative gas production 3277mL; pig manure and corn stalks the mixed fermentation optimal ratio 1.79:1, the maximum cumulative gas production for 6272mL . Under the conditions of 25 ° C, chicken manure and corn stalks mixed fermentation optimal ratio of 1.87:1, the largest cumulative gas production 10254mL; pig manure and corn stalks the mixed fermentation optimal ratio 1.68:1, maximum cumulative gas production 11000mL . Under the conditions of 30 ° C, the mixed fermentation of chicken manure and corn stalks optimal ratio 1.86:1 the largest cumulative gas production 12084mL; pig manure and corn stalks the mixed fermentation optimal ratio 1.89:1, the maximum cumulative gas production 11864mL ; cow manure and corn stalks mixed fermentation optimal ratio of 2.82:1, the maximum cumulative gas production 9895mL. 35 ℃ under the conditions of mixed fermentation of chicken manure and corn stalks optimal ratio of 1.81:1, the largest cumulative gas production 17000mL; pig manure and corn stalks the mixed fermentation optimal ratio 1.86:1, the maximum cumulative gas production 15246mL . 40 ° C under the conditions of chicken manure and corn stalks mixed fermentation optimal ratio of 1.46:1, the largest cumulative gas production 15095mL; pig manure and corn stalks the mixed fermentation optimal ratio 1.47:1, the maximum cumulative gas production 15513mL .
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