REMEDIATION OF HYDROCARBON CONTAMINATED SOILS USING PULVERIZED OYSTER AND SNAIL SHELLS .............

Hydrocarbon-contaminated soil was collected and treated with powdered oyster and snail shells, which were used as adsorbents for site rehabilitation. The total petroleum hydrocarbon of the seven soil samples was determined using a gas chromatography flame ionisation detector. The concentrations of Total hydrocarbon in samples 1, 2, and 3 before treatment were 14655.00 mg/kg, 12412.00 mg/kg, and 14906 mg/kg, respectively, according to the results. After thirty days, the hydrocarbon-affected soil samples were treated with powdered oyster shell, yielding 6188.00 mg/kg, 8543.00 mg/kg, and 12612.00 mg/kg, respectively. Similarly, before treatment, samples 4, 5, and 6 had the following results: 11295.00 mg/kg, 9456.00 mg/kg, and 12246 mg/kg, respectively. After thirty days, the soil samples were treated with powdered snail shell, yielding the following results: 5924.00 mg/kg, 6918.00 mg/kg, and 10532 mg/kg. The untreated control sample yielded a value of 13641.00 mg/kg. Petroleum hydrocarbons were reduced by 57.78 percent, 31.17 percent, and 15.36 percent in samples 1, 2, and 3 treated with powdered oyster shells, and 47.55 percent, 26.86 percent, and 14.00 percent in samples 4, 5, and 6 treated with pulverised snail shells, respectively. In general, oyster shells reduced petroleum hydrocarbons by a higher percentage than snail shells. The findings also demonstrated that powdered oyster and snail shells can be used to treat hydrocarbon-contaminated soils.

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