Mesophilic two-phase anaerobic digestion of waste activated sludge with different VS contents
Two types of waste activated sludge (WAS) and kitchen garbage were used to prepare the WAS samples with different volatile solid (VS) contents, and the digestion efficiencies of prepared samples were investigated by mesophilic two-phase anaerobic digestion (TPAD) process. The experimental results showed that the ratio of volatile fatted acids and bicarbonate alkalinity (VFA/BA) in acidogenic phase was 0.05 for the system with the addition of kitchen garbage, and those of WAS samples were both lower than 0.02, indicating better stabilization of the two-phase systems. The VS and total COD removal efficiencies increased with increasing hydraulic retention time (HRT). The maximum removal efficiencies of VS and total COD were achieved when the HRT was 20d, and the maximum VS and total COD removal efficiencies were 47.9％ and 49.2％, respectively. The specific methanogenic activity (SMA) and methane content of biogas both increased with increasing HRT. The addition of kitchen garbage into the low organic WAS sample could improve both organic removal efficiency and biogas yield.
waste activated sludge two-phase anaerobic digestion mesophilic garbage
Liguo Zhang Jun Yin Lei Liu Lixin Zang
School of Chemistry and Environment South China Normal University Guangzhou,P.R.China Department of Municipal and Environmental Engineering Jilin Architectural and Civil Engineering Inst
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）