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A study was conducted to investigate carbon adsorption of specific priority pollutants, (2,4 Dimethylphenol, Naphthalene, Fluorene, Pyrene, Bis(2-ethylhexyl phthalate) in a complex mixture background, using laboratory and pilot scale reactors for data generation , and various numerical computer models for data evaluation and subsequent prediction. Prediction of adsorption using intra-particle diffusion resistance (surface model and combined surface and pore diffusion model) was more successful using the combined surface and pore diffusion model than by using the surface model alone . Dissolved organic carbon (DOC) was selected as a complex mixture surrogate to evaluate any competitive effect due to individual components in the complex background mixture. Prediction of batch and packed bed adsorption of each of the specific priority organics that were studied was successful when the IAS model was adjusted by evaluating the adsorption equilibrium constants in a complex mixture background. Results from the laboratory scale experiments were verified by a pilot plant study utilizing 4 inch diameter by 3 feet deep carbon contactors with empty bed contact time of 1.75 and 3,75 minutes treating 2,4-dimethylphenol present in a complex mixture background consisting of a domestic secondary treatment effluent. ACKNOWLEDGEMENTS This project was funded by the Kuwait Institute for Scientific Research and the Kuwait Environmental Protection Council to whom the author feels deeply indebted. Without the awareness and concern of their directors and staff, this project would not have been made possible. I wish to express my sincer e gratitude to my advisor Dr. Leon T. Thiem for all his support, guidance and supervision throughout this project. I would also like to thank my committee members Dr. Calvin P.C. Poon for his valuable comments and suggestions, Dr. Raymond Wright for his valuable comments, suggestions and all those hours of side meetings we had, and to Dr. William Wright for his r eview and comments. Gratitude is extended to Milton and George Huston for all their help in the various stages of project progress as well as in constructing the pilot plant. Their skills and dedication permitted the timely completion of this study. Appreciation is sincerely expressed to the staff of South Kingstown Wastewater Treatment Facility for their cooperation and help in installing the pilot plant in a safe and secure lucation. My appreciation to Mary Costa and Kevin Fish for their excellent typing and patience in putting up with the quality of my handwriting. Unend i ng support, patience and encouragement from my wife Fairouz is greatly acknowledged.

Prediction of Specific Priority Organics Adsoption on Activated Carbon in Complex Background Mixtures