TY - JOUR
T1 - Effects of thermal-Fe (II) activated oxone treatment on sludge dewaterability
AU - Xiao, Keke
AU - Seow, Wan Yi
AU - Chen, Yun
AU - Lu, Dan
AU - Jiang, Xie
AU - Zhou, Yan
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - The enhanced dewaterability of waste activated sludge (WAS) by thermal, Fe (II), or thermal-Fe (II) activated oxone treatments was systematically investigated and compared. It was noted oxone oxidation induced by Fe (II) at the lowest tested temperature (25 °C) was more effective than any tested temperature alone induced oxone oxidation (25–80 °C). Temperature at mesophilic range can enhance the efficiency of Fe (II)-oxone treatment by 20%. Further increase of temperature to higher than 35 °C, e.g. 50 °C, did not remarkably improve the filterability of sludge in Fe (II)–oxone experiment. On the other hand, the worst performance was from thermophilic condition (80 °C) in Fe (II)-oxone experiment. The results demonstrated a significant combined effect of Fe (II)-oxone on improving sludge dewaterability within mild temperature ranging from 25 to 35 °C. Higher sludge filterability and flowability, as well as lower sludge viscosity were observed after treatment. The improvement of sludge dewaterability was achieved by removal of organic compounds in loosely-bound (LB) and tightly-bound (TB) extracellular polymeric substances (EPS). Furthermore, the improved sludge filterability was strongly correlated with the removal of dissolved organic matter (DOC), tyrosine-like proteins and fulvic acid-like materials in LB EPS. Economic analysis suggested the mesophilic Fe (II)-oxone treatment was promising for improving WAS dewaterability compared with the conventional thermal treatment.
AB - The enhanced dewaterability of waste activated sludge (WAS) by thermal, Fe (II), or thermal-Fe (II) activated oxone treatments was systematically investigated and compared. It was noted oxone oxidation induced by Fe (II) at the lowest tested temperature (25 °C) was more effective than any tested temperature alone induced oxone oxidation (25–80 °C). Temperature at mesophilic range can enhance the efficiency of Fe (II)-oxone treatment by 20%. Further increase of temperature to higher than 35 °C, e.g. 50 °C, did not remarkably improve the filterability of sludge in Fe (II)–oxone experiment. On the other hand, the worst performance was from thermophilic condition (80 °C) in Fe (II)-oxone experiment. The results demonstrated a significant combined effect of Fe (II)-oxone on improving sludge dewaterability within mild temperature ranging from 25 to 35 °C. Higher sludge filterability and flowability, as well as lower sludge viscosity were observed after treatment. The improvement of sludge dewaterability was achieved by removal of organic compounds in loosely-bound (LB) and tightly-bound (TB) extracellular polymeric substances (EPS). Furthermore, the improved sludge filterability was strongly correlated with the removal of dissolved organic matter (DOC), tyrosine-like proteins and fulvic acid-like materials in LB EPS. Economic analysis suggested the mesophilic Fe (II)-oxone treatment was promising for improving WAS dewaterability compared with the conventional thermal treatment.
KW - Dewaterability
KW - Different activation methods
KW - Extracellular polymeric substances
KW - Size-exclusion chromatography
KW - Thermal-Fe (II) activated oxone oxidation
KW - Waste activated sludge
UR - http://www.scopus.com/inward/record.url?scp=85017514446&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2017.04.055
DO - 10.1016/j.cej.2017.04.055
M3 - 文章
AN - SCOPUS:85017514446
SN - 1385-8947
VL - 322
SP - 463
EP - 471
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -