Journal of
Environmental Chemistry and Ecotoxicology

  • Abbreviation: J. Environ. Chem. Ecotoxicol.
  • Language: English
  • ISSN: 2141-226X
  • DOI: 10.5897/JECE
  • Start Year: 2009
  • Published Articles: 184

Full Length Research Paper

Removal of heavy metals from industrial effluents by water hyacinth (Eichornia crassipes)

Abolanle S. Adekunle1*, Olusegun O. Odukoya2, Joseph G. Ayenimo1, John A. O. Oyekunle1, Winston O. Doherty1, Bhekie B. Mamba3 and Michael S. Akanni1
  1Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria. 2Department of Chemistry, Federal University of Agriculture, Abeokuta, Nigeria. 3Department of Applied Chemistry, University of Johannesburg, P. O. Box 17011, Doornfontein, 2028, South Africa.
Email: [email protected] or [email protected]

  •  Accepted: 03 September 2012
  •  Published: 30 September 2012

Abstract

 

A study was carried out using water hyacinth as a pollution monitor for the simultaneous removal of heavy metals such as copper (Cu), cadmium (Cd), iron (Fe), zinc (Zn), lead (Pb), chromium (Cr) and aluminium (Al). Effluents were collected from eight industries including paint, textiles, aluminium, galvanizing and battery industries situated in Lagos State, Nigeria. After cultivation of the plant for seven days in a plastic bowl containing each effluent, while sampling was carried out from the bowl everyday, the collected samples were analyzed for Pb, Fe, Zn, Cr and Cu at wavelengths 248.3, 213.7, 357.9 and 324.9 nm respectively using atomic absorption spectrophotometry. Aluminium was determined using UVspectrophotometry and potassium was determined using a flame photometer. The results of the analysis indicated that the range of the heavy metal in the effluents before the cleaning process were Pb (0.1 to 4.4 ppm), Cr (0.39 to 0.5 ppm), Cu (0.08 to 1.65 ppm), Zn (0.7 to 8.7 ppm), Fe (1.2 to 7.5 ppm), Al (0.15 to 1.05 ppm) and Ni (0.6 to 49.2 ppm) while Cd was not detected in none of the effluents. The values were higher than the Federal Ministry of Environment and the World Health Organization effluent limitation guidelines recommended levels. The cleaning experiment showed that water hyacinth has the ability to clean-up the effluents of their heavy metals content by removing about 70 to 90% of their initial concentrations within four to six days of the experimental set-up.

 

Key words: Industrial effluents, heavy metals, water hyacinth, health impact, environmental pollution.