Estimation of Pollution Load of Domestic Sewage to Oued Bechar (SW Algeria) and its Impact on the Microbiological Quality of Groundwater

In urban areas, population growth generates significant quantities of wastewater that is treated in sewage treatment plants discharged directly or specialize in short uncontrolled water in Bechar Oued. Because of their different origins (domestic waste), these waters are often loaded with organic elements, minerals and microorganisms in which some could be harmful to health and contributes heavily to the degradation of groundwater that may be irreversible. This study was conducted on seven sites rated (R) wastewater localized in Bechar Oued (river), in April 2008, 2009 and 2010. It revealed alarming levels of nitrates, nitrites, nitrogen Kjeldahl (TNK) and ammonium and the presence of chromium and iodine is also detected. Eighteen groundwater samples tested SBi (bacteriological) are showing signs of recent contamination confirmed by the high rate of organisms sought (1400 CFU coliform, fecal coliform CFU 210, D 240 CFU streptococci, Clostridium sulfite reducers 5 CFU).