Evaluation the anaerobic hydrolysis acidification stage of kitchen waste by pH regulation

This study analyzed the composition and characteristic of kitchen waste (KW) from closed cleaning station of Chaoyang District, Beijing. It was featured by high vegetables and peels contents. This study investigated effect of pH regulation and uncontrolled pH (CK) on the lab-scale anaerobic hydrolysis acidification stage of KW. The optimal adjusting mode by NaOH (including dosage and frequency) was evaluated according to indexes of pH, VFAs, NH4+-N, TS, VS, TS/VS, TS and VS removal rate. The treatment 4 as first two days adjusting per 16 h and then one time per day at pH 7 was chosen as the optimal mode with high VFAs content(47.31 g/L), TS and VS removal rate (42.95% and 54.01%, respectively), low adjusting frequency, fewer dosage and practical operability. Thus, adjusting mode of treatment 4 could be considered using in anaerobic hydrolysis acidification stage on engineering.