University of Khartoum

Impacts of Water Reuse on Soil and Groundwater Case Study: Khartoum Waste Stabilisation Ponds

Impacts of Water Reuse on Soil and Groundwater Case Study: Khartoum Waste Stabilisation Ponds

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Title: Impacts of Water Reuse on Soil and Groundwater Case Study: Khartoum Waste Stabilisation Ponds
Author: Elbadawi, Diyaa Eldin Babiker
Abstract: Reuse of wastewater treatment plant effluent in irrigation is a solution in developing countries . The aim of this study was to investigate the effects of longterm effluent irrigation on soil and groundwater, choosing some physical and chemical properties, including heavy metals and nitrogen .Their movement and accumulation was investigated. The study area is the Green Belt plantation south of Khartoum where effluent is used to irrigate Eucalyptus trees for 40 yrs. Now effluent from Soba plant is used alone in irrigation, and it uses waste stabilization ponds. Soil and groundwater samples were taken from the irrigated area and compared to similar samples from a nearby non irrigated area. 1 m depth auger holes were used with samples taken every 25cm. Groundwater samples were taken from hand pumps (to represent the upper aquifer) and from deep wells (to represent the lower aquifer). The results show that in soil, organic N and nitrate are slightly higher in the irrigated area .Zn ,Cu and Cr were also higher . Pb and Cd were not detected. pH was lower. Sodium adsorption ratio , Electrical conductivity show erratic pattern. In groundwater , nitrate was lower in hand pump wells. Cr was higher. Cu and Zn were lower. Cd and Pb were not detected . The results suggest that there is no accumulation of nitrogen in soil and groundwater . There is accumulation of Cr, Zn and Cu in the soil with a marked movement in soil profile .Cr is accumulating in the upper aquifer. The results indicate that unaccumlation of nitrate on soil and groundwater is due to the presence of eucalyptus trees, which uses nitrate, whereas heavy metals like Cr, Cu and Zn are unused by plants, therefore there is accumulation of theses metals. Soil and groundwater comply with the standards used.
Description: 75page
URI: http://khartoumspace.uofk.edu/handle/123456789/9803
Date: 2015-04-28


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