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Chemical precipitation approach to the removal of heavy metals from wastewater for discharge into sanitary sewerage

Ayodele Akinterinwa, Idris Adebayo


NaOH, Ca(OH)2 and Na2CO3 were used as the precipitants in this study. The reaction time was set at 45 min, temperature at 50º C, pH at 9 for the hydroxides and 10 for the carbonate. Heavy metal ions precipitated includes; Pb2+, Cu2+, Mn2+, Zn2+ and Fe3+. NaOH exhibited highest precipitation for Cu2+ (99.2 %) and least for Zn2+ (75.2 %), Ca(OH)2 exhibited highest precipitation for Cu2+ (100 %) and least for Pb2+ (71.9 %), while Na2CO3 exhibited highest precipitation for Fe3+ (97.6 %) and least for Pb2+ (75 %). The precipitation of all the heavy metals ions were also compared for the precipitants. All precipitant are capable of removing at least 70% of the heavy metal ions studied form their aqueous solution while a narrow selection might take the value as high as 100%, hence showing adequate potentials of the precipitants in the removal of aqueous heavy metal ions at the set conditions form wastewater prior to discharge into sewerage.

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