果蔬废物CSTR-ASBR强化酸化分相厌氧消化产气性能研究

Performances of Two-phase CSTR-ASBR with Enhanced Hydrolysis and Acidification for Anaerobic Digestion of Fruit and Vegetable Wastes

采用CSTR-ASBR强化酸化分相工艺对果蔬废物厌氧消化产气性能进行研究。通过先将果蔬废物榨汁,果蔬渣水解酸化后再进入到甲烷相,果蔬汁直接进行甲烷化的方式,实现强化酸化与分相厌氧消化。结果表明:采用此种厌氧消化方式,可以使酸化相稳定运行的最高负荷达到16 gVS.L-1d-1,将酸化相的末端产物均换算成乙酸后,负荷产酸率平均在800 mg.gVS-1d-1以上,并形成稳定的乙醇发酵类型。甲烷相的有机负荷可从1 gVS.L-1d-1上升到5.5 gVS.L-1d-1,负荷产气率平均在500 mL.gVS-1d-1以上,CH4含量稳定在55%～60%之间。甲烷相运行的最优负荷为4 gVS.L-1d-1,负荷产气率与VS去除率分别可达557 mL.gVS-1d-1和83%,且系统稳定性能良好。

Two-phase CSTR-ASBR system with enhanced hydrolysis and acidification was advanced and used for anaerobic digestion of fruit and vegetable wastes（FVW） for biogas production. The performance of the system was investigated. FVW was firstly separated by extrusion. The solid fraction was hydrolyzed and acidified in acidogenic phase and then added into methanogenic phase and co-digested with liquid fraction. The results showed that the acidogenic phase reached maximum OLR of 16 gVS · L-1d-l , the VFA yield was 800 mg CH3COOH · gVS-ld-1 , and the phase maintained a stable ethanol- type fermentation. The methanogenic phase reached maximum OLR of 5.5 gVS · L-1 d-1 with biogas yield of 500 mL · gVS-1d-lon average. Methane content in biogas was in range of 55% ～ 60%. At the optimum OLR of methanogenie phase （4 gVS · L-ld-1）, the biogas yield and the VS removal rate were 557 mL · gVS-ld-tand 83% ,respectively. The system was operated in stable state.