Semi-continuous And Sequencing Batch Anaerobic Co-Digestion With Kitchen Waste And Pig Waste

In this thesis, studies semi-continous and sequencing batch anaerobic co-digestion with the kitchen waste and pig waste at the temperature of 35℃. Selected targeted inoculum pig waste from the outskirts of Chengdu.A semi-continous anaerobic co-digestion with the kitchen waste and pig waste at the temperature of 35℃to The test was gradually increased on the organic loading rate. The results show that the VFA and ammonia produced could maintain the pH in a certain range, which could help methanogenic bacteria growth and reproduction with the organic load of 0.5gVS/L.d and 0.75gVS/L.d. The methane content could be stabilized at 48%-57%, and the maximum value could reach 60.28%. The methane production rate and the performance of daily gas production rate were in the consistent, and the maximum methane production rates could be reached by 483 mL.VSg-1.d-1 The process from producing of the organic acid to the methanogenic phase could be reached a dynamic equilibrium.A sequencing batch anaerobic co-digestion with the kitchen waste and pig waste at the temperature of 35℃with the organic load of 0.5gVS/L.d, running a total of 61 days. The results show that the pH from the initial 7.1 dropped to 6.5, and then gradually rose to 7.0; The VFA content up to 8160mg/L and VFA was gradually transformed into CH4 and CO2 and other substances discharged with the reaction,, so that the acidity of a substance within the system degradation, system gas production back to normal, daily gas production reachde to peak 5570 mL.d-1, the maximum methane content of 68.9245%; the maximum methane production rates could be reached by 323 mL.VSg-1.d-1,and the cumulative gas production for the 116366 mL. Thus, the sequencing batch reaction mixture of anaerobic digestion phase after hydrolysis acidification and smoothly into the methane production phase with the organic load of 0.5gVS/L.d, so that the digestive system running stable.