TY - JOUR
T1 - Dewatering of saline sewage sludge using iron-oxidizing bacteria
T2 - Effect of substrate concentration
AU - WONG, Jonathan W C
AU - Murugesan, Kumarasamy
AU - Selvam, Ammaiyappan
AU - Ravindran, Balasubramanian
AU - Kurade, Mayur B.
AU - Yu, Shuk Man
N1 - Funding Information:
This work was financially supported by the Innovation and Technology Support Programme (Project No. ITS/297/11 ) of the Innovation and Technology Commission, Hong Kong SAR .
PY - 2016/8
Y1 - 2016/8
N2 - This study investigated the improvement in dewaterability of activated sludge (ACS) and anaerobically digested sludge (ADS) through bioacidification approach using iron-oxidizing bacterium, Acidithiobacillus ferrooxidans. ACS and ADS were treated with A. ferrooxidans culture with addition of different concentrations of energy substrate, in terms of Fe2+:sludge solids ratio (0:1, 0.01:1, 0.05:1 and 0.1:1), and the dewaterability was assessed by determining the capillary suction time (CST), time to filter (TTF) and specific resistance to filtration (SRF) of the sludge. The results revealed that the levels of Fe2+ significantly influenced the sludge acidification (pH ⩽ 3). The CST, TTF and SRF values rapidly decreased in treated sludge, indicating that dewaterability of the sludge was significantly (p < 0.05) improved than untreated sludge. This investigation clearly demonstrates that A. ferrooxidans culture, as biogenic flocculant, can be potentially used for improving the sludge flocculation, stabilization and dewaterability.
AB - This study investigated the improvement in dewaterability of activated sludge (ACS) and anaerobically digested sludge (ADS) through bioacidification approach using iron-oxidizing bacterium, Acidithiobacillus ferrooxidans. ACS and ADS were treated with A. ferrooxidans culture with addition of different concentrations of energy substrate, in terms of Fe2+:sludge solids ratio (0:1, 0.01:1, 0.05:1 and 0.1:1), and the dewaterability was assessed by determining the capillary suction time (CST), time to filter (TTF) and specific resistance to filtration (SRF) of the sludge. The results revealed that the levels of Fe2+ significantly influenced the sludge acidification (pH ⩽ 3). The CST, TTF and SRF values rapidly decreased in treated sludge, indicating that dewaterability of the sludge was significantly (p < 0.05) improved than untreated sludge. This investigation clearly demonstrates that A. ferrooxidans culture, as biogenic flocculant, can be potentially used for improving the sludge flocculation, stabilization and dewaterability.
KW - Acidithiobacillus ferrooxidans
KW - Activated sludge
KW - Anaerobically digested sludge
KW - Biogenic flocculant
KW - Sludge dewaterability
UR - http://www.scopus.com/inward/record.url?scp=84963706478&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2016.03.118
DO - 10.1016/j.biortech.2016.03.118
M3 - Journal article
C2 - 27095409
AN - SCOPUS:84963706478
SN - 0960-8524
VL - 213
SP - 31
EP - 38
JO - Bioresource Technology
JF - Bioresource Technology
ER -
