Anaerobic co-digestion of kitchen waste and pig manure with different mixing ratios

• 作 者: HailinTian;NaDuan;CongLin;XueLi;MingzhuZhong;
• 机 构: College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China
• 出 处: The 4th International Conference on Biomass Energy Technolog
• 发表日期: 2014年期

　　Anaerobic co-digestion of kitchen waste(KW)and pig manure(PM)with seven different PM to KW total solids(TS)ratios of 1:0,5:1,3:1,1:1,1:3,1:5 and 0:1 was conducted at mesophilic temperature(35±1°C)to investigate the feasibility and process performance.The co-digestion of PM and KW was tested to be an available way to enhance the methane production compared with solo-digestion of PM or KW.The ratio of PM and KW of 1:1 got the highest biodegradability(BDA)of 85.03%with the methane yield of 409.5mL/g·VS.For the co-digestion of KW and PM,there was no accumulation of ammonia nitrogen ranging from 1380mg/L to 2020mg/L in the whole process.However,severe methane inhibition and long lag phase due to the accumulation of volatile fatty acids(VFAs)happened while KW ratio was over 50%,and in the lag phase,propionic acid and butyric acid consisted of the major compositions of the total VFAs.The technical digestion time(T80)of the above 7 ratios was 15,21,22,27,49,62 and 61 days,respectively.In this study,PM and KW are complementary at an appropriate mixing ratio,and the ratio of 1:1 is recommended owing to a high BDA and methane yield,a short digestion time and stable digestion performance.