【摘要】 分别采用两种不同来源的剩余污泥以及剩余污泥与厨余垃圾的混合物进行两相厌氧消化,考察了不同有机质含量污泥的中温厌氧消化性能。结果表明,添加厨余垃圾后系统产酸相的VFA/BA值约为0.05,三个系统产甲烷相的稳定性较好。随着HRT的延长,各系统对VS和TCOD的去除率均逐渐升高,当HRT为20 d时,混合系统对VS与TCOD的去除率达到最大,分别为47.9%和49.2%,显著高于其他两个系统。随着HRT的延长,各系统的SMA活性逐渐提高,而且产气中的甲烷含量也随之增加。研究表明,在有机质含量偏低的剩余污泥中添加有机固体废物,不仅可以提高对有机质的去除率,还可以提高沼气产量。更多还原

【Abstract】 Two types of waste activated sludge(WAS) and kitchen garbage were used to prepare the WAS samples with different organic contents,and the digestion efficiencies of prepared samples were investigated using mesophilic two-phase anaerobic digestion(TPAD) process.The experimental results show that the ratio of volatile fatty acids and bicarbonate alkalinity(VFA/BA) in acidogenic phase is 0.05 for the system with the addition of kitchen garbage,and the three systems have good stability in methanogenic phase.The removal rates of VS and total COD are increased with increasing hydraulic retention time(HRT).The maximum removal rates of VS and total COD in the mixed system are achieved(47.9% and 49.2% respectively) when the HRT is 20 d,significantly higher than those in other two systems.The specific methanogenic activity(SMA) and methane content in biogas are both increased with increasing HRT.The addition of kitchen garbage into the low organic WAS can improve both organic removal efficiency and biogas yield.更多还原