期刊
WATER AND ENVIRONMENT JOURNAL
卷 26, 期 4, 页码 560-566出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1747-6593.2012.00319.x
关键词
bioflocculant; combination; flocculation rate; Klebsiella sp; sludge dewatering
资金
- Planned Science and Technology Project of Hunan Province, China [2007WK2004, 2009WK3048]
A bioflocculant-producing bacterium, named N-10, was isolated from activated sludge and was identified as Klebsiella sp. The bioflocculant (named MBF10) produced by Klebsiella 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 Al2(SO4)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 x 1012 m/kg, respectively. The combined use of MBF10 and Al2(SO4)3 resulted in optimum sludge dewatering properties, SRF reduced from 10.87 x 1012 m/kg to 1.72 x 1012 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.
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