Abstract
Comprehensive review of the literature is presented and research studies of groundwater recharge with treated wastewater which offers a means for water re-use which has several advantages is described. The removal of nitrogen was studied in detail, since it is a major polutant in secondary sewage effluent and because soil adsorption is an important pre-requisite in its removal. A mathematical model was developed based on the processes contributing to nitrogen removal, in order to simulate the overall process and to optimize nitrogen removal. A simplified and yet realistic model was derived for management purposes.