添加园林废物及冻融预处理对餐厨垃圾厌氧消化效率的影响

通过批处理试验，研究了三种不同类型园林废物〔小叶桉叶，美人蕉叶以及混合杂草(包括空心莲子草、猪毛蒿和胜红蓟)〕对餐厨垃圾厌氧消化的影响。结果表明，添加混合杂草处理表现出最佳的甲烷生产能力，甲烷产率达到827.0 mL/g(以挥发性固体计，下同)；而添加小叶桉叶和美人蕉叶处理，甲烷产率分别为307.9和287.3 mL/g。冻融预处理可以使添加混合杂草处理和美人蕉叶处理的甲烷产率分别提高25.0%和85.4%，混合杂草处理的产能效益由6 106 kW·h/t提高到7 633 kW·h/t，美人蕉叶处理的产能效益则由1 694 kW·h/t提高到3 141 kW·h/t。

Influence of Garden Green Wastes Addition and Freeze-thaw Pretreatment on Food Waste Anaerobic Digestion Efficiency

The influences of three different garden green wastes, including leaves of eucalyptus, canna lily, and weed mixture of alligator alternathera, vergate wormwood and tropic ageratum, on anaerobic digestion of food waste were investigated in a batch test. The results indicated that the treatment with weed mixture had the highest capacity to produce methane from volatile solid (VS) degraded, with the production rate of 827.0 mL/g (VS). In the treatments with leaves of eucalyptus and canna lily, the VS-methane production rates were at 307.9 mL/g(VS) and 287.3 mL/g(VS), respectively. The freeze-thaw pretreatment effectively improved methane production by 25.0% and 85.4% in the treatments with weed mixture and canna lily leaves, respectively. The energy production benefits were increased from 6 106 kW?h/t(VS) to 7 633 kW?h/t(VS) for the weed mixture treatment, and from 1 694 kW?h/t(VS) to 3 141 kW?h/t(VS) for the canna lily leaves treatment. Therefore, the addition of herbal garden waste and freeze-thaw pretreatment could enhance energy production benefit for anaerobic co-digestion of food wastes, and thus be an effective way to convert municipal solid wastes into renewable energy.