Influence of dry anaerobic fermentation manure-straw ratio on volumetric biogas yield

Abstract

For better conversion and application of sugarcane leaf dry anaerobic fermentation biogas technology, the self-made cylinder type fermentation tank pilot system was established through a 150-day pilot test by using continuous biogas model. The results showed that there was no significant difference in the volumetric biogas yield within the manure-straw ratio range of 0.25 at the 0.01 level. The average volumetric biogas production was between 1047.30 L·(m3·d)-1 and 1192.20 L·(m3·d)-1. The mean volumetric biogas yield of the manure-straw ratio of 3 was only 174.74 L·(m3·d)-1, which was significantly lower than the remaining manure-straw ratio less than 0.0001. On the level of 0.6346, the fermentation temperature will not affect the volumetric biogas yield within the controlled range. The optimum manure-straw ratio ranges from 0.25 to 2. When the volume is too small or too large, the volumetric biogas yield will significantly decline, which cancan reduce the difficulty of preparing the raw material manure-straw ratio and is beneficial for the promotion of sugarcane leaf dry anaerobic fermentation biogas technology and the pilot test equipment.