تقييم نوعية المياه في بحيرة المزيريب

Water quality in Mzereb lake was assessed during 2010-2011 by measuring number of physical, chemical and microbiological parameters which are important in determination water quality. These include water temperature, pH, electrical conductivity (EC), total dissolved solids (TDS), dissolved oxygen (DO), clarity by depth of Secchi disk (SD), turbidity, nitrate NO3 - , nitrite NO2 - , phosphate PO4 -3 , sulfate SO4 -2 , chemical oxygen demand (COD), total organic carbon (TOC), biochemical oxygen demand (BOD), heterotrophic bacteria viable count (VCHB), direct total count of bacteria (DTC), total coliforms, total number of algae, number species of algae. these parameters were related together statistically by measuring Person correlation coefficient using STATISTICA program. The results show high increase in pH values to 9.55 in October and DO decrease to 0.12 mg.l-1 in November while COD values reached 40 mg.l-1 in November. The maximum value of algal abundance was in October 3500 cell.ml-1 while the number of species reached 40 species in June, also the number of Coliforms reached 13837 CFU.ml-1 in February, this indicate the occurrence organic pollution and decline in the healthy quality of Mzereb lake.