TY - JOUR
T1 - Effects of Loosely Bound EPS Release and Floc Reconstruction on Sludge Dewaterability
AU - Zhang, Haifeng
AU - Lu, Xin
AU - Song, Lianfa
AU - Zhang, Lanhe
N1 - Funding Information:
Acknowledgments The authors wish to thank the National Science Foundation of China (Nos. 51478093 and 51678119) and the Jilin Province Scientific and Technological Planning Project of China (No. 20170519013JH).
Publisher Copyright:
© 2018, Springer International Publishing AG, part of Springer Nature.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - Loosely bound extracellular polymeric substances (LB-EPS) are highly hydrated biopolymers and play important roles in sludge biofloccualtion and dewaterability. Disruption or solubilization of LB-EPS will promote the alternation of sludge structure and the release of trapped water. In the present study, ultrasonication was employed to extract LB-EPS into the supernatant and release trapped water within them. Excellent performance in enhancing ultrasonicated sludge dewatering was observed under the combined Fe3+(20 mg/g dry sludge (DS)) and Ca2+ (30 mg/g DS) addition. The above fact highlighted the probability to enhance the sludge dewaterability by the dosage of small amount of cations. Further, the combined effects of ultrasonication and multivalent cation addition on floc regrowth on sludge dewaterability were investigated and the possible mechanisms involved in the reorganization of sludge structure and the biofloccualtion process were also explored. In conclusion, the combination of ultrasonication and multivalent cation addition was promising to improve sludge dewaterability.
AB - Loosely bound extracellular polymeric substances (LB-EPS) are highly hydrated biopolymers and play important roles in sludge biofloccualtion and dewaterability. Disruption or solubilization of LB-EPS will promote the alternation of sludge structure and the release of trapped water. In the present study, ultrasonication was employed to extract LB-EPS into the supernatant and release trapped water within them. Excellent performance in enhancing ultrasonicated sludge dewatering was observed under the combined Fe3+(20 mg/g dry sludge (DS)) and Ca2+ (30 mg/g DS) addition. The above fact highlighted the probability to enhance the sludge dewaterability by the dosage of small amount of cations. Further, the combined effects of ultrasonication and multivalent cation addition on floc regrowth on sludge dewaterability were investigated and the possible mechanisms involved in the reorganization of sludge structure and the biofloccualtion process were also explored. In conclusion, the combination of ultrasonication and multivalent cation addition was promising to improve sludge dewaterability.
KW - Activated sludge
KW - Bioflocculation
KW - Extracellular polymeric substances
KW - Multivalent cations
KW - Sludge dewaterability
UR - http://www.scopus.com/inward/record.url?scp=85041577681&partnerID=8YFLogxK
U2 - 10.1007/s11270-017-3683-z
DO - 10.1007/s11270-017-3683-z
M3 - Article
AN - SCOPUS:85041577681
SN - 0049-6979
VL - 229
JO - Water, Air, and Soil Pollution
JF - Water, Air, and Soil Pollution
IS - 2
M1 - 27
ER -