Contamination Of Groundwater By Sewage And Degradation Of Cultures Under Water Stress

Abstract

Since the eighties, water surpluses caused by discharges of urban waste water without any pre-treatment, joined the traditional channel of Wadi Righ which joins the natural depression of Chott Melghir and Merouane. The lack of an adequate and effective drainage system and overexploitation of aquifers deep waters have caused upwelling, which caused an imbalance in the valley. The physicochemical analysis and pollution, has shown that collector canal waters are of very poor quality, very hard and salt content can exceed 7 g / l of dry residue of high salinity (class C5) electrical conductivity of up to 26,30 ms / cm, a SAR > 28 (S4 class) , a value of TDS of up to 21 g / l, BOD5, COD and TSS levels high. Combined with the presence of a water table near the surface, sterilization of several Agricultural areas was observed, mostly canal water is loaded with minerals, it is a brackish facies the sodium chloride.