牛粪和厨余垃圾联合厌氧消化试验

Anaerobic Digestion of Mixture of Cow-Dung and Kitchen Waste

在37℃条件下对不同比例的牛粪和厨余垃圾进行为期50d的联合厌氧消化试验。结果表明:(1)牛粪与厨余垃圾质量比2/1和1/2联合厌氧消化的实际产气潜能为0.66和0.71L·g-1(以挥发性固体VS质量计),比加权计算值分别提高50%和29%;(2)4种比例物料的甲烷平均浓度约为50%～55%,其生物能范围为18.92～20.81MJ·m-3;(3)在联合厌氧消化过程中,牛粪和厨余垃圾质量比1/2物料的产气效率最高,反应前10d的产气量占总产气量的55.4%,前20d产气量占总产气量的92.2%;(4)纯牛粪、牛粪和厨余垃圾质量比2/1、牛粪和厨余垃圾质量比1/2及纯厨余垃圾4种比例物料厌氧消化的最终生物降解率分别为46.99%、53.31%、70.12%和66.25%。

An experiment was carried out on anaerobic digestion of cow-dung （CD） and kitchen waste （KW） mixtures different in ratio under 37 ℃ for 50 days. Results show that （ 1 ） when the mixture was formed at a ratio of 1/2 and 2/1, its actual biogas production potential was 0.66 and 0.71 L·g^-1, respectively, calculated on the basis of volatile solids total mass, about 50% and 29% higher than its weighted calculation, respectively; （2）the mean methane concentration of the four treatments varied in the range of 50% -55% in ratio and their mean bioenergy yielded in the range of 18.92 - 20.81 MJ · m^-3;（3）among the four treatments, Treatment CD1/KW2 was the highest in biogas generating efficiency. The biogas it generated in the first 10 days and 20 days accounted for 55.4% and 92.2% of the total it yielded, respectively; （4）the ultimate biodegradability of the 4 treatments, i.e. CD, CD2/KW1, CD1/KW2 and KW, was 46.99% , 53.31% ,70. 12% ,and 66.125% , respectively.