TY - JOUR
T1 - Fate of extracellular polymeric substances of anaerobically digested sewage sludge during pre-dewatering conditioning with Acidithiobacillus ferrooxidans culture
AU - Murugesan, Kumarasamy
AU - Ravindran, Balasubramani
AU - Selvam, Ammaiyappan
AU - Kurade, Mayur B.
AU - Yu, Shuk Man
AU - WONG, Jonathan W C
N1 - Publisher Copyright:
© 2016
PY - 2016/10/1
Y1 - 2016/10/1
N2 - This study investigated the fate of extracellular polymeric substances (EPS) of anaerobically digested saline sewage sludge during its preconditioning. Sludge was conditioned with Acidithiobacillus ferrooxidans (AF) culture for 24 h in the presence and absence of Fe2+ as an energy substrate. pH decreased from 7.24 to 3.12 during sludge conditioning process. The capillary suction time (CST) of conditioned sludge significantly decreased to <10 s, and specific resistance to filtration (SRF) was reduced by >94% as compared with control within 4 h of conditioning with or without Fe2+, indicating a significant (P < 0.001) improvement in sludge dewaterability. A noticeable decrease in extractable EPS was observed in conditioned sludge. The EPS contents showed a significant negative correlation with dewaterability of sludge (P < 0.05). The results suggest that bioacidification treatment using A. ferrooxidans effectively improved sludge dewaterability through modification of sludge EPS.
AB - This study investigated the fate of extracellular polymeric substances (EPS) of anaerobically digested saline sewage sludge during its preconditioning. Sludge was conditioned with Acidithiobacillus ferrooxidans (AF) culture for 24 h in the presence and absence of Fe2+ as an energy substrate. pH decreased from 7.24 to 3.12 during sludge conditioning process. The capillary suction time (CST) of conditioned sludge significantly decreased to <10 s, and specific resistance to filtration (SRF) was reduced by >94% as compared with control within 4 h of conditioning with or without Fe2+, indicating a significant (P < 0.001) improvement in sludge dewaterability. A noticeable decrease in extractable EPS was observed in conditioned sludge. The EPS contents showed a significant negative correlation with dewaterability of sludge (P < 0.05). The results suggest that bioacidification treatment using A. ferrooxidans effectively improved sludge dewaterability through modification of sludge EPS.
KW - Acidithiobacillus ferrooxidans
KW - Anaerobically digested sludge
KW - Bioflocculant
KW - Extracellular polymeric substances
KW - Sludge dewaterability
UR - https://www.scopus.com/pages/publications/84962086325
U2 - 10.1016/j.biortech.2016.03.081
DO - 10.1016/j.biortech.2016.03.081
M3 - Journal article
C2 - 27040507
AN - SCOPUS:84962086325
SN - 0960-8524
VL - 217
SP - 173
EP - 178
JO - Bioresource Technology
JF - Bioresource Technology
ER -
