Evaluation of bioflocculants produced by some bacteria and their use to remove artificial turbidity from water

Abstract

Bioflocculants offer a number of advantages over chemical flocculants for wastewater treatment. They are more environmentally friendly, safer, and often low cost-effective. The flocculating activity of bioflocculants to remove turbidity at a dose 4 ml were 45% ,27.19% ,41.19% and 44.28 % by bacterial species Escherichia coli, Arcobacter cloacae, Aeromonas simiae, Exiguobactirum profundum respectively while, at a dose 8 ml were 49.65%, 31% ,64 47% and 63.71. The flocculating activity of bioflocculants at (100/40) speed to remove turbidity by bacteria Escherichia coli, Arcobacter cloacae, Aeromonas simiae and Exiguobactirum profundum were 47.94% ,37.1%, 66.63% and 62.89% respectively while at (200/40) speed was 48%, 35.5%, 62.89% and 65.12%. The flocculating activity at a mixing time (4 min) to remove turbidity was 51.19%, 32.7%, 70.28% and 67.80% while, at 6 min was 41.79%, 34.98%, 71.67% and 70.0%. The result exhibited two bacteria Aeromonas simiae and Exiguobactirum profundum have the best efficiency in removing turbidity when tested on of synthetic turbid water in the laboratory. There for the bioflocculants have potential activity for industrial wastewater treatment.