New insights into the evaluation of anaerobic properties of sludge: Biodegradability and stabilization
Xiaohu Dai , Jun Gao , Xiaoyan Zhao , Sisi Chen , Bin Dong
DOI:10.1016/j.jes.2020.07.021
Received June 07, 2020,Revised , Accepted July 20, 2020, Available online July 28, 2020
Volume 33,2021,Pages 158-166
Evaluating anaerobic biodegradability of sludge and then identifying the stabilization of digestate is necessary in sludge treatment and disposal. 48 sludge samples from 24 typical waste water treatment plants (WWTPs) in 11 provinces in China were selected to investigate the relationship between Biochemical Acidogenic Potential (BAP) test and Biochemical Methane Potential (BMP) test. The volatile fatty acid (VFA) production obtained from BAP tests was found linearly related to the ultimate methane production from corresponding BMP tests. Satisfying results were obtained with Pearson correlation coefficient as 0.929 and R2 value as 0.76. Furthermore, the physio-chemical characteristics (FCI, SUVA254, E4/E6) of supernatant, which were associated with humic-like substances (HS), were investigated before and after BMP tests. Through which a new criterion (FCI>1.50, SUVA254>1.10, E4/E6<4.0) was proposed to evaluate the stabilization level of anaerobic digested sludge.
