The Optimized Study On The Pivotal Parameters Of Agriculture Residues Dry Anaerobic Fermentation

With the rapid development of large scale breeding, the need of biogas engineering willcontinually increase. At the same time, the need of centralized biogas supply will also increase goingwith country and small town developing. Large scale dry anaerobic fermentation of agricultural residueswill be a new choice for the treatment and utilization of agricultural residues. In order to offerfoundation and reference for the large scale dry anaerobic of agricultural residues applying in ourcountry, based on the preceding result of the single factor analysis, this study focused on optimizing thekey parameters of dry anaerobic fermentation process by multi-factor analysis in lab scale, eventuallyestimated the optimized process by the biogas output and fermentation fertilizer quality.Under the process condition of cattle manure and maize straw as fermentation material,composting fermentation material 7 days, 20% total solid content of input material and mesophilictemperature (35℃), L₉(3⁴) orthogonal experiment was ran, the factors of which were the ratio of cattlemanure to maize stalk (1:0,2:1,1:1), inoculation proportion(15%,20%,25%), liquid agitation (0,one timeper 48 hours,one time per 24 hours).By the orthogonal experiment with the target of total biogas yieldduring fermentation period, this paper concluded that during 30 days fermentation period the optimizedprocess parameters combination is non-liquid-agitation, 1:0 the ratio of manure to straw, 15%inoculation proportion, or non-liquid-agitation, 1:0 the ratio of manure to straw, 15% inoculationproportion.Eventually, this paper estimated the two optimized processes by experiment reaseach. Theexperiment result indicated that the two optimized processes had some characteristics, such as highdaily biogas production (L/L.d), high methane content, low nitrogen loss, comparatively high nutrientcontent of output material, nicer appearance characters of output material, comparatively high total solidcontent of output material. Consequently, we can conclude that the two optimized processes are ideal foragricultural treatment and utilization.