Growth and production of biomass of Rhodovulum sulfidophilum in sardine processing wastewater

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Aims:Rhodovulum sulfidophilum was grown in sardine processing wastewater to assess growth characteristics for the production of bacterial biomass with simultaneous reduction of chemical oxygen demand.Methods and Results:Growth characteristics were compared in diluted and undiluted, settled and non-settled wastewater growing in anaerobic light and aerobic dark conditions; and also at different agitation speeds. The highest biomass (8·75 g l−1) and a reduction in chemical oxygen demand of 71% were obtained in unsettled, undiluted wastewater after 120 h culture with 15% inoculum. In settled wastewater, highest biomass (7·64 g l−1) and a COD reduction of 77% was also obtained after 120 h. Total biomass was higher (4·34 g l−1) after 120 h culture in anaerobic light compared to (3·23 g l−1) in aerobic dark growth.Conclusions, Significance and Impact of the Study:Better performance, mean of total biomass (6·97 g l−1 after 96 h), total carotenoids (4·24 mg g−1 dry cell from 24 h) and soluble protein (431 μg ml−1 after 96 h) were obtained from aerobic dark culture at 300 rev min−1. The COD reduction, however, was lower (69%) after 96 h culture. Thus, the benefits in the production of bacterial biomass in non-sterilized sardine processing wastewater with the reduction of chemical oxygen demand could be achieved.

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