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以餐厨垃圾和玉米秸秆(按TS1:1混合)为原料,开展了200d的连续高温发酵和40d批次产甲烷潜能与动力学实验,进料TS浓度8%,以水力停留时间15,10,8,5d的梯度变化逐级增加容积负荷.连续实验发现,在水利停留时间为5d时达到了系统酸化的极限负荷16gVS/(L·d),通过及时停止进料和投碱控制pH值,一周内有机酸浓度由4.73g/L降低到1.02g/L.当OLR为10gVS/(L·d)时,TS去除率和甲烷转化率分别为55.6%和64.5%.批次实验发现,餐厨垃圾、秸秆和混合原料的产甲烷潜能分别为448,221,268mLCH_4/gVS,最大产甲烷速率常数(K)为63,45,41mLCH_4/(g VS·d).通过连续和批次实验分别获得了混合原料高温甲烷发酵的工艺参数和动力学特征,为餐厨垃圾和秸秆能源化利用提供了一个有效途径.
A continuous high-temperature fermentation of 200d and a 40d batch methane production potential and kinetic experiment were carried out with food waste and corn stalk (mixed by TS1: 1). The feed TS concentration was 8% and the hydraulic retention time was 15 and 10 , And gradually increase the volumetric load by the gradient of 8 and 5 days.Under continuous experiments, it was found that the system acidification limit load reached 16gVS / (L · d) at the dwell time of 5 d, , And the organic acid concentration decreased from 4.73g / L to 1.02g / L in a week.When the OLR was 10gVS / (L · d), the TS removal efficiency and methane conversion were 55.6% and 64.5% The methane yield potential of food waste, straw and mixed raw materials were 448,221,268 mLCH_4 / gVS and the maximum methane production rate constants (K) were 63,45 and 41 mLCH_4 / (g VS · d) respectively.According to continuous and batch experiments, The process parameters and kinetic characteristics of high temperature methane fermentation of mixed raw materials provide an effective way for the energy utilization of food waste and straw.