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

Authors

  • Ayodele Akinterinwa
  • Idris Adebayo

DOI:

https://doi.org/10.37591/jowppr.v6i1.320

Abstract

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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Published

2019-05-21

Issue

Vol. 6 No. 1 (2019)

Section

Articles

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