Journal
CARBOHYDRATE POLYMERS
Volume 113, Issue -, Pages 463-470Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.07.045
Keywords
Biofiocculants; Flocculating activity; Metal ion; Paenibacillus mucilaginosus; Purification
Categories
Funding
- Program for the Fundamental Research Funds for the Central Universities [2013ZZ0066]
- National Natural Funds of China [21376098]
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The production and purification of polysaccharide-based bioflocculants (PSBs) by Paenibacillus mucilaginosus GIM1.16 in metal ion-supplemented medium and basal medium were evaluated. Three purified PSB1-1,PSB2-1 and PSB3-1 possessed different monosaccharide composition and their molecular weights were 2.53 x 10(6), 7.77 x 10(6) and 13.2 x 10(6) Da, respectively. FT-IR spectrometry indicated the presence of hydroxyl, carboxyl and phosphate groups in the three samples. Scanning electron microscopy showed that they had linear structure. The potential of these PSBs on wastewater treatment was evaluated. Among them, PSB1-1 exhibited the best performance, as it had high flocculating activities (above 94%) at 0.5-4 mg/L and could achieve high flocculating activities (above 97%) in the kaolin suspensions of pH 3-9. PSB1-1 was the key factor that might explain the enhanced flocculating activity of the supernatant from metal ion-supplemented medium. The performance of PSB1-1 on industrial wastewater was also satisfactory. PSB1-1 might be a good candidate as bioflocculant. (C) 2014 Elsevier Ltd. All rights reserved.
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