ADSORPTION OF TRACE ORGANIC-COMPOUNDS IN CRISTAL(R) PROCESSES

A mathematical model for the removal of micropollutants in PAC/UF syst ems was successfully verified with experimental data. The model was ba sed on a single set of equilibrium and kinetic parameters that were in dependently evaluated in bench-scale experiments. Laboratory-scale UF pilot plant experiments were conducted to determine the accuracy of mo del predictions for atrazine removal in the presence of natural organi c matter. Good agreement was obtained between model predictions and ex perimental data. Greater mass of atrazine was adsorbed when all PAC wa s dosed at one time at the beginning of the membrane cycle as compared to PAC dosage at a constant rate throughout the membrane cycle. The m odel can be used to rapidly test different types of PAC and to optimiz e the process operating procedures for the removal of trace organic co mpounds in the presence of natural organic matter.