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The menace of wastewater pollution in the 21st century is becoming alarming. Application of the low-cost adsorbents for wastewater treatment has received more attention this moment in environmental history than never. Most industrial wastewater has not been receiving adequate treatment prior to disposal into the nearby stream, and this is a potential threat to plants and animals feeding therefrom. There is therefore the need to proffer an effective solution to this pollution problem. An approach of bioremediation with a cost-effective plant waste is considered apt, with the application of Azadirachta indica (Neem tree) bark as adsorbent in this study. Galvanizing/wire-gauze industrial wastewater effluents were collected and subjected to Atomic Absorption Spectrophotometry (AAS) analysis to determine the concentrations of heavy metals. Phytochemical and Proximate analyses of the adsorbent were performed while adsorption study with the effects of adsorbent dosage, contact time, stirring speed and pH on the adsorption process during the wastewater treatment was carried out. The adsorption isotherms and kinetic models that best described the adsorption of Pb 4+ and Cr 3+ were established. The respective initial concentrations of Cr 3+ , Fe 2+ , Pb 4+ , Mn 2+ , Cu 3+ , Zn 2+ , and Cd 2+ in the wastewater were 1.8, 1.4, 1.0, 0.6, 0.4, 0.3, and 0.1 mg/l. The % of alkanoid, saponin, tannin, flavonoid and phytate in the adsorbent were 0.09, 0.1, 0.2, 0.3 and 0.03 respectively. Its proximate analysis yielded 4.7, 0.9, 10.0, 13.3, 12.0 and 59.3% for moisture, crude protein, crude fat, crude fibre, ash and carbohydrate in that order. The adsorption capacities were found as 0.099 and 0.20 mg/g respectively for Pb 4+ and Cr 3+ with optimum adsorbent dose of 0.2 g/L in both cases. The maximum observed adsorption is about 50 and 67% respectively for Pb 4+ and Cr 3+ . The adsorption patterns of Pb 4+ and Cr 3+ with Azadirachta Indica were both optimum with Freundlich isotherm model. Adsorption of Pb 4+ largely follows the Pseudo 2nd Order kinetics model, whereas the same model was perfectly observed by the Cr 3+ adsorption. It is concluded that Azadirachta Indica bark is very efficient in remediating Cr 3+ and efficient in that of Pb 4+ from metal-galvanizing wastewater. Considering the cost, ease of preparation and minimal slugde after treatment, its application in remediating Cr 3+ from metal-galvanizing industrial wastewater is hereby strongly recommended.

Performance evaluation of Azadirachta Indica (Neem Tree) bark in the remediation of Pb4 + and Cr3 + from galvanizing industrial wastewater