RETARDATION FACTORS AND BREAKTHROUGH TIMES OF ORGANIC MICROPOLLUTANTSIN GROUNDWATER RECHARGED WITH EFFLUENTS

In the Dan Region Reclamation Center (DRRC) in Israel, secondary efflu ents, after a mechanical biological treatment and polishing ponds, und ergo a Soil-Aquifer Treatment (SAT), in the course of which these are recharged into an isolated aquifer, and the repumped water is used for various agricultural purposes, In the present study a simple model ha s been developed in order to predict retardation factors and breakthro ugh times of various micropollutants in the SAT system. The model is b ased on the linear free energy relationship between adsorbtivity of or ganic compounds and their hydrophobicity as expressed by their octanol - water partition coefficients. A very good correlation was found bet ween the predicted values calculated by the model, and experimental la boratory results of adsorption isotherms and breakthrough curves. Copy right (C) 1996 IAWQ. Published by Elsevier Science Ltd.