No abstract

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 × 1012 m/kg, respectively. The combined use of MBF10 and Al2(SO4)3 resulted in optimum sludge dewatering properties, SRF reduced from 10.87 × 1012 m/kg to 1.72 × 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.

No abstract

No abstract

No abstract

No abstract

No abstract

No abstract