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A novel bioflocculant produced by K lebsiella sp . and its application to sludge dewatering
Author(s) -
Yang Qi,
Luo Kun,
Liao Dexiang,
Li Xiaoming,
Wang Dongbo,
Liu Xian,
Zeng Guangming,
Li Xu
Publication year - 2012
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2012.00319.x
Subject(s) - flocculation , dewatering , polyacrylamide , chemistry , activated sludge , pulp and paper industry , filtration (mathematics) , cationic polymerization , chloride , chromatography , nuclear chemistry , wastewater , environmental engineering , environmental science , mathematics , polymer chemistry , organic chemistry , geotechnical engineering , engineering , statistics
A bioflocculant‐producing bacterium, named N ‐10, was isolated from activated sludge and was identified as K lebsiella sp. The bioflocculant (named MBF10) produced by K lebsiella sp . had a good flocculating capability and could achieve a flocculating rate of 86.5% to kaolin suspension at the dosage of 0.034 g/L. Compared with chemical flocculants, such as Al 2 (SO 4 ) 3 , polyaluminum chloride ( PAC ) and cationic polyacrylamide ( PAM ) at their optimal dosages, MBF10 showed a similar performance for sludge dewatering. After preconditioning, dry solids ( DS ) and specific resistance to filtration ( SRF ) of the sludge were 17.5% and 3.36 × 10 12 m/kg, respectively. The combined use of MBF10 and Al 2 (SO 4 ) 3 resulted in optimum sludge dewatering properties, SRF reduced from 10.87 × 10 12 m/kg to 1.72 × 10 12 m/kg, and DS increased from 13.1% to 21.3%. Charge neutralisation and interparticle bridging were proposed as the reasons for the enhanced performance based upon the experimental observations.