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- 저자 : Simphiwe P. Buthelezi (검색결과 1 건)
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Simphiwe P. Buthelezi,Ademola O. Olaniran,Balakrishna Pillay 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.5
Bioflocculants produced by six bacteria obtained from activated sludge at a wastewater treatment plant were quantified, purified, and characterized. Effects of pH,temperature, cationic salt content, and specific potential inhibitors on the flocculating activities of the bioflocculants were also determined. Bioflocculants produced by the different bacterial isolates ranged between 6.33 and 27.66g/L in concentration and were composed of both carbohydrate and protein in varying amounts, as well as a relatively high concentration of uronic acid. The flocculating activity of the broth culture increased during the logarithmic phase of bacterial growth with a maximum ranging from 2.395 to 3.709/OD. Optimum pH for the flocculating activity of the bioflocculants was between 8and 9, with generally higher flocculating activity observed at 28oC. Of the cations tested, Mg2+ and Mn2+improved flocculating activity up to 5.2 fold. The stability of these bacterial bioflocculants under various environmental and nutritional conditions suggests their possible use in the industries and environmental applications. Therefore, this study details important implications in providing a safer alternative flocculation method for wastewater treatment.
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