USE OF PULVERIZED OYSTER AND SNAIL SHELLS IN THE REMOVAL OF HEAVY METALS FROM HYDROCARBON CONTAMINAT

Heavy metals were removed from an oil spill polluted soil from Eneka Community in Obio-Akpor Local Government Area using oyster and snail shells as adsorbents. Atomic Absorption is a term that refers to the process of Heavy metal concentrations in each of the seven soil samples were measured using a spectrophotometer before and after treatment with powdered oyster and snail shells. Heavy metals in soil samples (A, B, and C) before treatment yielded the following results: After treatment with powdered oyster shells (A1, B1, and C1), Ni: 2.27 – 4.53 mg/kg (control sample 3.75 mg/kg); Cr: 48.80 – 58.10 mg/kg (control sample 47.70 mg/kg); Zn: 13.40 – 19.40 mg/kg (control sample 17.34); Cr: 48.80 – 58.10 mg/kg (control sample 47.70 mg/kg); Zn: 13.40 – 19. Before treatment with powdered snail shell, the following data were obtained: Ni: 1.70 – 3.97 mg/kg (control sample 3.61 kg/kg); Cr: 50.70 – 57.40 mg/kg (control sample 48.60 mg/kg); Zn: 10.90 – 20.10 mg/kg (control sample 17.50 mg/kg); Ni: 1.05 – 3.59 mg/kg; Cr: 35.80 – 53.91 mg/kg; Zn: 8.43 The amounts of Cadmium, Copper, Lead, and Vanadium in the contaminated soil samples, however, were below the detection limit of the equipment. Ni 42.29 percent, 33.55 percent, 21.85 percent, Cr 37.52 percent, 19.06 percent, 5.47 percent, and Zinc 49.12 percent, 23.88 percent, 18.18 percent, correspondingly, were the percentage reductions of metals in samples A, B, and C treated with powdered oyster shells. In soil treated with powdered snail shell D, E, and F, the percentage reduction in metal concentrations was: Ni: 38.24 percent, 21.11 percent, 9.57 percent; Cr: 29.39 percent, 12.72 percent, 6.08 percent; and Zn: 31.84 percent, 22.66 percent, 15.69 percent, respectively. Pulverized oyster shells, on average, exhibited a higher percentage reduction than pulverised snail shells. The findings also showed that powdered oyster and snail shells can be used to remove heavy metals from soils affected by hydrocarbons.

Please see the link :- https://www.ikprress.org/index.php/JOGEE/article/view/6700