Chemical Analysis of Some Industrial Effluents That Discharge into Lagos Lagoon, Nigeria

Effluent from two different companies Afprint (textile) and Nigeria Breweries Plc. that discharge into Lagos Lagoon were collected at different drainage channels and analysed for physico-chemical parameters and heavy metals. The level of the physico-chemical parameters considered such as pH, alkalinity, biological oxygen demand, chemical oxygen demand, dissolve oxygen and alkalinity were very high. Nigeria breweries effluent had the highest values of most of these parameters. Heavy metals like Mn, Pb, Cd, Cr, Fe and Cu were present in all the effluents from the companies. Cu, Zn, Mn, Pb and Fe were the most common heavy metals in all the effluents while Cr was found consistently in textile effluents. The Fe in Brewery's effluent doubles that of textile's effluent There was decreasing concentration of some metals (Fe, Cu, Cd, Mn, Cr, Zn, Mn, Pb, Cr, Cu and Hg) from their source towards the Lagoon.