Elemental Study on the Biogas Anaerobic Fermentation with Crops Straw

The effect of ammonia pretreatment,straw length,inoculation,sludge humidity, temperature,and nitrogen source on anaerobic fermentation of crops straw for biogas production were studied in this manuscript.The results showed that the optimum condition for straw anaerobic fementation is the straws was 8 cm length and pretreatment with 10% ammonia liquor, inoculation proportion 1:1.5(dry mass),control the humidity of sludge 91.7%,and the culture temperature 35℃,with supplement of 0.5% urea.The biogas yield is 92.33 mL/g straw with these optimum conditions,and the digestion time of crops straw in the anaerobic reactor was 13～16d.