Remediation of organic chloride (2,4-dichlorophenol ) from wastewater: kinetics and thermodynamics investigations

Dichlorophenol compounds are persistent and highly water-soluble pollutants and their presence in marine, industrial and urban wastewater led to accumulation in the environment, and therefore, a serious pollution problem. The remediation of organic chloride (2,4-Dichlorophenol (DCP)) from wastewater by sorption technique was studied by applying different sorbents. Higher removal of 2,4 dichlorophenol was achieved on silica under certain physico-chemical conditions. Maximum removal (92.7%) of 2,4 dichlorophenol (50 mg.dm/sup -3/) was achieved with contact time of 4 hours, at ph 8 and 42 deg. C. The thermodynamic values for enthalpy (delta H), entropy (delta S), and free energy (delta G/sub 315K/) were found. The sorption data obtained at optimized conditions was subjected to Freundlich and Langmuir isotherms. Pseudo first order and second order kinetic model were applied. Elovich kinetic model was best to describe the kinetics for DCP. Intra particle diffusion kinetic model graph was best fitted for DCP. The developed method was applied for industrial wastewater treatment and the results suggested a 97 +- 0.1% removal of 2,4-dichlorophenol from industrial wastewater. (orig./A.B.)