半连续泔脚垃圾与猪粪混合厌氧消化研究

摘要

Under mesophilic condition（35℃）,the anaerobic co-digestion rules of the kitchen waste was studied in semi-continuous feeding mode by increasing organic loading rate（OLR） gradually.The digestion test showed a dynamic equilibrium between the acidification phase and the methanogenic phase at OLR of 1gVS/（L.d）,1.25gVS/（L.d）and 1.5gVS/（L.d）,respectively.The value of biogas and CH4 yield showed a similar variation.PH,VFA and ammonia were maintained at around 7.2,360 mg/L,1 500 mg/L,respectively.When the OLR is 1.5gVS/（L.d）,the biogas yield and average CH4 content obtained the maximum figure of 1.40L/g and 71.3%,respectively.By then,the anaerobic digestion system achieves best performance.%在中温（35℃）条件下,采用逐渐提高有机负荷的半连续进料方式,研究泔脚垃圾厌氧消化规律。在1gVS/（L.d）、1.25 gVS/（L.d）和1.5 gVS/（L.d）的有机负荷下,厌氧消化系统能够稳定运行,实现水解酸化阶段和产甲烷阶段的动态平衡,甲烷产率与日产气量的变化规律一致,pH、VFA、氨氮浓度分别保持在7.2和360mg/L1、500 mg/L左右。当有机负荷为1.5 gVS/（L.d）,每克VS的甲烷产率和甲烷百分数出现最大值,分别为1.40 L/g7、1.37%,此时厌氧消化系统处于最佳运行状态。