TY - JOUR
T1 - Dynamics of humic substance composition during anaerobic digestion of excess activated sludge
AU - Liu, Ranbin
AU - Hao, Xiaodi
AU - van Loosdrecht, Mark C.M.
AU - Zhou, Peng
AU - Li, Ji
PY - 2019
Y1 - 2019
N2 - Inhibition by humic substances (HSs) on anaerobic digestion of excess activated sludge is one of the limitations for converting more organics into biogas. In order to counteract the inhibition from HSs, the present study was initiated to understand the dynamic changes (content and structure) of HSs during the anaerobic digestion of synthetic and real sludge. For the first time, the present work studied the dynamics of HSs separately in the liquid and solid phases. These observations on HSs conversions by potentiometric titration, UV–Vis, FTIR, and two-dimensional infrared spectra, confirmed that the dynamic changes of HA and FA compositions were caused by losing aliphatic moieties and enriching aromatic moieties in the structural compositions. This changes increased the humification degree, aromaticity, and the amounts of oxygen-containing functional groups. Based on the observations, strategies to alleviate the inhibition effect were discussed.
AB - Inhibition by humic substances (HSs) on anaerobic digestion of excess activated sludge is one of the limitations for converting more organics into biogas. In order to counteract the inhibition from HSs, the present study was initiated to understand the dynamic changes (content and structure) of HSs during the anaerobic digestion of synthetic and real sludge. For the first time, the present work studied the dynamics of HSs separately in the liquid and solid phases. These observations on HSs conversions by potentiometric titration, UV–Vis, FTIR, and two-dimensional infrared spectra, confirmed that the dynamic changes of HA and FA compositions were caused by losing aliphatic moieties and enriching aromatic moieties in the structural compositions. This changes increased the humification degree, aromaticity, and the amounts of oxygen-containing functional groups. Based on the observations, strategies to alleviate the inhibition effect were discussed.
KW - Anaerobic digestion
KW - Excess activated sludge
KW - Fulvic acid
KW - Humic acid
KW - Humic substances
KW - Inhibition reverse
UR - http://www.scopus.com/inward/record.url?scp=85071473487&partnerID=8YFLogxK
U2 - 10.1016/j.ibiod.2019.104771
DO - 10.1016/j.ibiod.2019.104771
M3 - Article
AN - SCOPUS:85071473487
SN - 0964-8305
VL - 145
JO - International Biodeterioration and Biodegradation
JF - International Biodeterioration and Biodegradation
M1 - 104771
ER -