TY - JOUR
T1 - Enhanced dewaterability of anaerobically digested sewage sludge using Acidithiobacillus ferrooxidans culture as sludge conditioner
AU - Murugesan, Kumarasamy
AU - Ravindran, Balasubramani
AU - Selvam, Ammaiyappan
AU - Kurade, Mayur B.
AU - Yu, Shuk Man
AU - WONG, Jonathan W C
N1 - Funding Information:
Authors thankfully acknowledge the financial support of Innovation and Technology Support Programme (Project No. ITS/297/11), Innovation and Technology Commission , Hong Kong SAR Government.
PY - 2014/10
Y1 - 2014/10
N2 - Role of Acidithiobacillus ferrooxidans culture in bioacidification and dewaterability of anaerobically digested sewage sludge (ADS) was investigated. A. ferrooxidans culture grown in 9K medium along with Fe2+ produced iron flocculant containing, secondary iron minerals and biopolymeric substances as confirmed by FT-IR, XRD, and SEM-EDX. Bioacidification of ADS was performed using 10% (v/v) A. ferrooxidans culture, isolated cells and cell-free culture filtrate; and dewaterability was assessed using the capillary suction time (CST) and specific resistance to filtration (SRF). Isolated bacterial cells significantly (P<0.05) reduced the sludge dewaterability when supplemented with Fe2+ while the whole culture and cell-free filtrate rapidly acidified the sludge without Fe2+ and showed significant reduction of CST (71.3-73.5%) and SRF (84-88%). Results clearly indicated that the culture and filtrate of the A. ferrooxidans facilitated rapid sludge dewaterability while the cells supplemented with Fe2+ also enhanced dewaterability but required 2-4days.
AB - Role of Acidithiobacillus ferrooxidans culture in bioacidification and dewaterability of anaerobically digested sewage sludge (ADS) was investigated. A. ferrooxidans culture grown in 9K medium along with Fe2+ produced iron flocculant containing, secondary iron minerals and biopolymeric substances as confirmed by FT-IR, XRD, and SEM-EDX. Bioacidification of ADS was performed using 10% (v/v) A. ferrooxidans culture, isolated cells and cell-free culture filtrate; and dewaterability was assessed using the capillary suction time (CST) and specific resistance to filtration (SRF). Isolated bacterial cells significantly (P<0.05) reduced the sludge dewaterability when supplemented with Fe2+ while the whole culture and cell-free filtrate rapidly acidified the sludge without Fe2+ and showed significant reduction of CST (71.3-73.5%) and SRF (84-88%). Results clearly indicated that the culture and filtrate of the A. ferrooxidans facilitated rapid sludge dewaterability while the cells supplemented with Fe2+ also enhanced dewaterability but required 2-4days.
KW - Acidithiobacillus ferrooxidans
KW - Anaerobically digested sewage sludge
KW - Sludge conditioning
KW - Sludge dewaterability
UR - http://www.scopus.com/inward/record.url?scp=84904893461&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2014.06.057
DO - 10.1016/j.biortech.2014.06.057
M3 - Journal article
C2 - 25064335
AN - SCOPUS:84904893461
SN - 0960-8524
VL - 169
SP - 374
EP - 379
JO - Bioresource Technology
JF - Bioresource Technology
ER -
