厨余垃圾与污泥厌氧发酵产甲烷的协同作用

以剩余污泥和厨余垃圾混合进行共发酵,评估其厌氧发酵协同效果,基于挥发性固体悬浮物(VSS)设置剩余污泥和厨余垃圾比例为1∶0,4∶1,2∶1,1∶1,1∶2,1∶4,0∶1的生化甲烷潜势(BMP)实验,通过厌氧发酵前后pH值、COD、总氮、氨氮、硝酸盐氮等参数的变化,甲烷产量,碳的迁移、转化和微生物群落结构变化评价协同...

Synergistic effect of kitchen waste and sludge anaerobic fermentation for methane production

Excess sludge and kitchen waste were co-fermented to evaluate the synergistic effect of anaerobic fermentation. Based on the volatile solid suspension, excess sludge and kitchen waste ratios of 1:0, 4:1, 2:1, 1:1, 1:2, 1:4, 0:1 were employed to conduct the biochemical methane potential experiments. The synergistic methanogenic effect was evaluated by combining the changes of pH, COD, TN, NH₄⁺-N, NO₃^--N, gas production, carbon migration and transformation, and microbial community structure before and after anaerobic fermentation. During anaerobic fermentation of excess sludge, the addition of kitchen waste could significantly improve the sludge degradation ability of microorganisms and increase methane production. The maximum methane production at the ratio of 1:4was 274.37mL/g-VSS, with a synergistic growth rate of 27.41%. The addition of kitchen waste delayed the methanogenic time, promoted the transfer of carbon elements from solid phase to liquid phase to gas phase, and increased the growth and reproduction of methanogenic bacteria (Methansaeta) and their auxiliary bacteria (Longilinea, etc.).