Growth of Freshwater Microalga, Botryococcus sp. in Heavy Metal Contaminated Industrial Wastewater

  • Joan Iye Onalo Department of Technology and Heritage, Faculty of Science, Technology and Human Development. Univerisiti Tun Hussein Onn Malaysia
  • Hazel Monica Matias Peralta Department of Technology and Heritage, Faculty of Science, Technology and Human Development. Univerisiti Tun Hussein Onn Malaysia
  • Norshuhaila Mohamed Sunar Department of Chemical Engineering Technology, Faculty of Chemical Technology Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia
Keywords: Keywords, Industrial Wastewater, Heavy Metals, Microalgae, Botryococcus sp.

Abstract

The aim of this study was to determine the growth and the bioremoval capacity of the green microalga, Botryococcus sp. grown in industrial wastewater contaminated with heavy metals. The freshwater green microalga, Botryococcus sp. was cultured in different concentrations of wastewater (25%, 50% and 100%) with an initial cell concentration of 1000 cells/ml for a period of 12 days. Bold basal medium and sterile distilled water were used as positive and negative control, respectively. The Botryococcus sp. grown in Bold’s basal medium showed the highest (P<0.05) average growth rate (7.8 × 106 cells/ml) after a period of 12 days, whereas, the lowest (P<0.05) growth was observed in 50% concentration of wastewater (4.8 × 104 cells/ml). Similar results were obtained for the specific growth rate (µ/day) with an average of 1.93µ/day and 1.22µ/day for the positive control and the 50% concentration respectively. Highest reduction of heavy metals was achieved for chromium which is equivalent to 94%, followed by copper (45%), arsenic (9%) and cadmium (2%). The results of this study suggest the potential of Botryococcus sp. as bioremediator of wastewater contaminated with heavy metals. 

Published
2014-12-22
How to Cite
Onalo, J. I., Peralta, H. M. M., & Mohamed Sunar, N. (2014). Growth of Freshwater Microalga, Botryococcus sp. in Heavy Metal Contaminated Industrial Wastewater. Journal of Science and Technology, 6(2). Retrieved from https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/947