Journal of Pure and Applied MicrobiologyVol. 6 No. 1

Bioaccumulation Potency of Ecotoxic Heavy Metals by Indigenous Rhizopus and Penicillium sp: A Comparative Study

C.K. Shivakumar¹, B. Thippeswamy¹, M. Krishnappa² and K.S. Ananthamurthy³

¹Department of P.G. Studies and Research in Microbiology, ²Department of P.G. Studies and Research in Applied Botany, ³Department of P.G. Studies and Research in Applied Geology, Kuvempu University, Bio-Science Complex, Jnanasahyadri, Shankaraghatta-577 451, India.

Received on 25 May 2011 and accepted on 06 July 2011

 

ABSTRACT

Tolerance and accumulation ability for Cu2+, Zn2+, Cr6+, Cd2+, Ni2+ and Pb2+ were investigated in aqueous medium and untreated effluent by Rhizopus sp and Penicillium sp isolated from paper mill effluent. Physicochemical content for untreated and treated paper mill effluent was analyzed as per standard method. Effect of heavy metals on fungal growth, morphology and metal accumulation was observed with control. Rhizopus sp tolerated 1000ppm of Pb followed by Cu, Zn (500ppm), Cd (250ppm). Penicillium sp tolerated metals in the order of Pb (1000ppm), Zn (500ppm), Cr (250ppm) and Cd (100ppm). Rhizopus sp showed high Pb (69%) uptake followed by Cu (48%), Cd (47%) and Zn (44%). In Penicillium sp Zn (47%) tolerance was high followed by Pb (46%), Cd (26%), and Cr (18%). Growth with significant reduction in heavy metals (Cd, Zn, and Pb) observed in untreated industrial effluent inoculated with fungal biomass when compared with treated industrial effluent.

Keywords : Bioaccumulation, Heavy metals, Industrial Effluent, Rhizopus sp., Penicillium sp.