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The Bio-adsorption of Heavy Metals from Produced Water using Mango (Mangifera indica) Peel and Corn (Zea mays) Cobs as Bioadsorbents

Benjamin Opia

This research work was carried out to determine the bioadsorption of heavy metals from produced water using Mango (Mangifera indica) Peel and Corn (Zea mays) as bioadsorbents. The bioadsorbents were categorized into biomass and biochar and where characterized by determining the iodine number (microspore), Methylene Blue Number (specific surface area), % organic matter (loss in ignition), Ash Content, Moisture content, pH, TDS and TSS. The isothermal analysis showed that the experimental data are best fitted on the Langmuir model. The contact time, adsorption capacity and removal efficiency was determined through the Adsorption analysis and digestion. The absorbance and concentrations were recorded. Data were examined using the Langmuir isotherm and Chi-square. It was revealed that the biochar of corn cob and mango peel are viable materials for the removal of heavy metals from produced water with corn cob having the highest adsorption capacity and removal efficiency of 20.8% and 97.3% respectively. Their adsorption rate in heavy metal removal and reduction was within the Department of Petroleum Resources (DPR) regulatory standard and norm. The biomass is poor bioadsorbents which tends to dissolve their metallic nutrients back into the produced water solution. It was revealed that the highest rate of adsorption takes place at shorter contact time below the 30 mins experimented. Also, increasing pH results yields increasing rate of adsorption. The biochar of the bioadsorbents can be applied to larger scale industrial waste water replete with heavy metals.