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Potentials of phototrophic bacteria in treating pharmaceutical wastewater
Article 18: Volume 7, Number 1, Winter 2010, Pages 165-174 (10) XML PDF (1351 K)
Authors
E. I. Madukasi; X. Dai; Ch. He; J. Zhou
Abstract
A suspended growth photobioreactor was utilized to treat pharmaceutical wastewater by a wild strain purple non-sulfur photosynthetic bacterium isolated from the soil. The strain was named Z08 and identified as Rhodobacter-sphaeroides by 16SrDN. The photobioreactor was illuminated externally with two (40 W) fluorescent compact light sources on both sides. Its operation pH and temperature were between 6.8 – 7.0 and 20 – 30 ºC, respectively. Optimum growth of the isolate was obtained after enrichment of the pharmaceutical wastewater with 0.5 % ammonium sulfate and 0.1 % yeast extract under microaerobic optimum light (6000 lx) condition at 5d retention. Using these optimum conditions, the maximum dry cell weight and chemical oxygen demand percentage removal were 880 mg/L and 80 %. Chemical analysis of the culture after treatment of the enriched and non-enriched wastewater showed the crude protein content of the biomass to be 54.6 % and 38.0 %, respectively. This study proved that photosynthetic bacteria could transform complex wastewater that contains recalcitrant organic compounds with a resultant recovery of useful products.
Keywords
Biotreatment; Microaerobic light; Photosynthetic bacteria; Purple non sulfur bacteria; Static light exposure reactor
Main Subjects
Phototrophic bacteria; Pharmaceutical wastewater
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