Focus on adsorptive equilibrium, kinetics and thermodynamic components of petroleum produced water biocoagulation using novel Tympanotonos Fuscatus extract

Abstract

Adsorptive component of produced water (PW) coagulation using Tympanotonos Fuscatus coagulant (TFC) was studied. Influence of the following parameters: pH, coagulant dose, settling time, and temperature were investigated. The functional group, crystalline nature, morphological observation and thermal characteristics of the sample were evaluated. Equilibrium data were analyzed using Langmuir, Freundlich, Temkin, Frumkin, and Dubinin-Radushkevich (D-R) adsorption isotherms. The kinetics data were fitted to reversible first order, pseudo-first-order, pseudo-second-order, elovich, intra-particle diffusion and Boyd kinetic models. Adsorption Gibbs energy, enthalpy and entropy were evaluated. Equilibrium data best fitted the Langmuir isotherm (R² > 0.99; X² < 1.6; SSE < 1.6). Reversible first order model correlated best to the kinetics data. The values of process average Gibb's free energy, enthalpy and entropy were 30.35, 27.88 and 0.1891 kJ/mol, respectively. The process was spontaneous, feasible and endothermic in nature. The maximum efficiency of 83.1% was favored at pH 2.0. This study indicated significant adsorptive component, while using Tympanotonos Fuscatus extract as readily available, renewable, ecofriendly bio -coagulant for efficient treatments of PW.

Keywords

Petroleum produced water / Coagulation / Adsorption / T.Fuscatus shell

Acknowledgements

The Authors wish to thank the following organizations:

Chemical Engineering Department, Nnamdi Azikiwe University, Awka, Nigeria.

Water Resources Center, Civil and Environmental Engineering Department, Texas Tech University, Lubbock, Texas, USA.

Fulbright Program, Council for International Exchange of Scholars (CIES),

Washington, DC 20005-2403 USA.

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