Event Title
Location
London
Event Website
http://www.csce2016.ca/
Description
Groundwater is becoming an essential water resource in Egypt due to the deficit in water balance. It is planned to increase withdrawal in 2017 to 7.5 BCM and 3.5 BCM from renewable and non-renewable groundwater aquifers, respectively. In recent years there have been efforts to protect this water resource. The main objective of this paper is studying the impacts of reusing treated wastewater in irrigation after natural attenuation through the vadose zone. Hydrogeological data were collected to characterize the aquifer in Sadat City. A field program was conducted to identify the saturated hydraulic conductivities of the aquifer and the contaminant concentrations in groundwater. Field investigations were conducted by drilling five boreholes in the study area and five monitoring wells were installed. Groundwater flow and solute transport were simulated by VISUAL MODFLOW and MT3D. Four contaminants of concern were selected for simulation: magnesium, chloride, iron and nitrates. Seven irrigation scenarios were tested: primary treated wastewater, secondary treated wastewater, oxidation pond wastewater, tertiary treated wastewater, tertiary for double field water duty, irrigation with two-year rotation (primary treated wastewater and groundwater) and in the last scenario the study area is divided into 3 zones and irrigated with tertiary treated wastewater, oxidation pond wastewater and groundwater. The simulation results of the seven scenarios were presented and compared to the initial concentrations in groundwater. The results show that the contaminants of concern concentrations depend on initial concentrations in groundwater and the quality of the infiltrated water from the vadose zone.
Included in
ENV-625: IMPACTS OF TREATED WASTEWATER REUSE IN IRRIGATION ON GROUNDWATER: CASE STUDY OF SADAT CITY – EGYPT
London
Groundwater is becoming an essential water resource in Egypt due to the deficit in water balance. It is planned to increase withdrawal in 2017 to 7.5 BCM and 3.5 BCM from renewable and non-renewable groundwater aquifers, respectively. In recent years there have been efforts to protect this water resource. The main objective of this paper is studying the impacts of reusing treated wastewater in irrigation after natural attenuation through the vadose zone. Hydrogeological data were collected to characterize the aquifer in Sadat City. A field program was conducted to identify the saturated hydraulic conductivities of the aquifer and the contaminant concentrations in groundwater. Field investigations were conducted by drilling five boreholes in the study area and five monitoring wells were installed. Groundwater flow and solute transport were simulated by VISUAL MODFLOW and MT3D. Four contaminants of concern were selected for simulation: magnesium, chloride, iron and nitrates. Seven irrigation scenarios were tested: primary treated wastewater, secondary treated wastewater, oxidation pond wastewater, tertiary treated wastewater, tertiary for double field water duty, irrigation with two-year rotation (primary treated wastewater and groundwater) and in the last scenario the study area is divided into 3 zones and irrigated with tertiary treated wastewater, oxidation pond wastewater and groundwater. The simulation results of the seven scenarios were presented and compared to the initial concentrations in groundwater. The results show that the contaminants of concern concentrations depend on initial concentrations in groundwater and the quality of the infiltrated water from the vadose zone.
https://ir.lib.uwo.ca/csce2016/London/Environmental/14
