Research on the efficiency of acid-producing and gas-producing based on the enhancement of high-performance composite strains

摘要

A batch test was carried out to investigate the effect of acid-producing fermentative characteristic of a new complex strains LZF-12 with high lignocellulose-degradation ability, which straw was the only carbon source in acidogenic phase Simultaneity, the biogas-producing performance was also researched by shifting the liquid end products from acidongenic phase to methane phase, which fermentative substrate was the mixture of cow dung and kitchen waste The results indicated that major fermentation products of acidogenic phase was acetic acid accounted for 70% of total volatile acid, which would be in favor of microorganism's growth of methanogenic phase In two-phase anaerobic fermentation system, the straw degradation rate of composite strains LZF-12 reached the maximum at 72 hour, among which the degradation rate of cellulose, hemicellulose and lignin reached 55%, 67% and 13% respectively The methane percentage of biogas-producing phase was more than 50% and 1347mL/g VS of methane production rate was obtained.