Coagulation enhancement of exopolysaccharide secreted by an Antarctic sea-ice bacterium on dye wastewater

[Display omitted] ▶ Bsi20310 EPS effectively enhanced the coagulation of RX-3B dye by ferric chloride. ▶ Important effects, coagulation enhancement process and mechanism have been studied. ▶ NaCl had little effect on the enhancement of Bsi20310 EPS. The purpose of this paper is to study the enhancem...

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Bibliographic Details
Published in:Separation and purification technology 2010-12, Vol.76 (2), p.215-221
Main Authors: Zhou, Weizhi, Shen, Boling, Meng, Fanping, Liu, Shengbo, Zhang, Yuzhong
Format: Article
Language:English
Subjects:
Applied sciences
Bacteria
Chemical engineering
Coagulation enhancement
Decolorization
Exact sciences and technology
Exopolysaccharide
General purification processes
Pollution
Pseudoalteromonas
Reactive brilliant red X-3B
Wastewaters
Water treatment and pollution
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Summary:[Display omitted] ▶ Bsi20310 EPS effectively enhanced the coagulation of RX-3B dye by ferric chloride. ▶ Important effects, coagulation enhancement process and mechanism have been studied. ▶ NaCl had little effect on the enhancement of Bsi20310 EPS. The purpose of this paper is to study the enhancement of Bsi20310 exopolysaccharide (Bsi20310 EPS, secreted by an Antarctic sea-ice bacterium Pseudoalteromonas sp. Bsi20310), on coagulation of reactive brilliant red X-3B (RX-3B) by ferric chloride. The effect of solution pH, EPS addition timing and NaCl concentration for coagulation of RX-3B was investigated. The results showed that at pH 10, Fe(III) dosage of 55 mg/L, adding 150 mg/L Bsi20310 EPS enhanced the decolorization effectively. NaCl had little effect on the enhancement of Bsi20310 EPS. The EPS had negative surface charge and could combine with positive Fe(III)–dye flocs to form neutralized settleable Fe(III)–dye–EPS flocs. Results of residual Fe(III) concentration and ferric–ferron reaction kinetics indicated that EPS addition led not only more Fe(III) to participate in coagulation but also to form more Fe b (the most effective ferric hydrolysis species) in coagulation. Bsi20310 EPS enhanced Fe(III) coagulation performance by neutralization, bridging and sweeping to improve the floc aggregation.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2010.10.011