Effect of Factors on the Capability of Biogas Production in Anaerobic Fermentation for BMW

The effect of factors,like the ratio of material and sludge,the degree of granule and different pH in anaerobic fermentation,on the production of biogas was studied.The result showed that a good ratio of material and sludge was beneficial to the growth of microorganism,the velocity of the volume and biogas production daily.It was also said the volume of biogas was up to 1400ml and the content of methane was more than 50% on the thirteenth day when the ratio of material and sludge was 5/3 or 5/4.There was a great difference in the volume of biogas and the content of methane in different size.It was beneficial to improve the volume and the velocity of biogas production,especially the hydrolyzing reaction and the digesting process by decreasing the size.It was shown that the content of methane was up to 51% and the volume of biogas was to 1290ml daily when the granule size was 1cm.It was also propitious to produce the biogas and enhance the content of methane.When the pH was 7.5,the volume of biogas production was much more and the content of methane was more than 51%.