International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
Vol. 7, No. 1, 2010, pp. 165-174
Bioline Code: st10018
Full paper language: English
Document type: Research Article
Document available free of charge
International Journal of Environment Science and Technology, Vol. 7, No. 1, 2010, pp. 165-174
© Copyright 2010 - Center for Environment and Energy Research and Studies (CEERS)
Potentials of phototrophic bacteria in treating pharmaceutical wastewater|
Madukasi, E. I.; Dai, X.; He, C. & Zhou, J.
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.
Biotreatment; Microaerobic light; Photosynthetic bacteria; Purple non sulfur bacteria; Static light exposure reactor
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