A novel bioflocculant produced byKlebsiella sp. and its application to sludge dewatering

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.

Characterization and Evaluation of Dewatering Properties of PADB, a Highly Efficient Cationic Flocculant

“…4 Concentrations of EPS harvested from different flocculants at different pH are shown in Figure 8. The quantity of EPS harvested from different flcculants varied with pH.…”

Palm oil mill effluent as a low-cost substrate for bioflocculant production by Bacillus marisflavi NA8

“…bioflocculants, has recently attracted huge scientific and biotechnological consideration. Bioflocculants have been widely used in various industrial processes, including water treatment (Buthelezi et al 2009;Li et al 2009), wastewater flocculation and settling (Gong et al 2008;Li et al 2013), wastewater colour removal (Solis et al 2012;Zhang et al 2009), sludge dewatering (More et al 2010;Yang et al 2012), heavy metal removal (Chien et al 2013;Mikutta et al 2012), toxic organic compound removal (Zhang et al 2011), landfill leachate treatment (Renou et al 2008) and soil remediation and reclamation (More et al 2014).…”

Bioflocculant from pre-treated sludge and its applications in sludge dewatering and swine wastewater pretreatment

“…Currently, bioflocculant has been regarded efficiently in removing pollutants (like suspended solids, organic pollutants, and heavy metal ions) from wastewaters on laboratory scale (Guo et al, 2013), but there is hardly report on its application in sludge dewatering (Yang et al, 2012). Further, the knowledge about the performance of bioflocculant in actual project is lacking, and the parameters relating with pollutant removal, such as COD, ammonium, and turbidity were not determined .…”