El-Sanafawy Hamida - Nour El-Din, M. And Talha, N. I.( 2013). Monitoring Of Some Chemical And Biological Pollutants In Wastewater Drains Of Middle Delta RegionEgypt. J. Soil Sci. (In Pres)
Abstract: There are many drains in Egyptian Middle Delta region were used for sewage waste water and industrial effluents. Because of the irrigation of agricultural crops, therefore, it becomes a dangerous source of pollution as it contains different contaminants of chemical pollutants, namely, heavy metals and biological pollutants like coliform bacteria. The aim of the present study was to monitor the presence of some serious heavy metals and pathogenic bacteria in addition to biological oxygen demand (BOD) and chemical oxygen demand (COD) in waste water of the main drains of Mid. Delta region, in order to assess the degree of pollution in the water of these drains. Chemical analysis of cations and anions revealed that drainage water of al Nasr fertilizer was the highest value of Na+ and Hco3- ,sugar beet industry was the highest value of K+ and cl- while kafer Elzaiat industries were highest value of Mg++ and high content for Ca++ , Na+ , Cl- and So4= Heavy metals determined are pb, Cd, Ni, Zn, Cu and Mn. E. coli, Salmonella sp. and Shigella sp. viable counts were estimated. Along with these estimations, BOD and COD were determined. All these parameters are considered as indicators for pollution when present with levels surpassed those of international permissible concentrations.
Concentrations of heavy metals (ppm) in the drains of wastewater ranged from 0.131 to 1.850; 0.014 to 0. 999; 0.222 to 0.996; 0.143 to 0.742; 0.126 to 0.622; 0.226 to 0.693 for pb, Cd, Ni, Zn, Cu, and Mn, respectively. Concentrations of the studied heavy metals were higher than the maximum permissible levels by FAO (1992) except for Zn which was found within the permissible concentration. The data, also, recorded high numbers of parasites; E. coli, Salmonella and Shigella which were present in the drainage wastewater with estimates surpassed the permissible values. Estimates of BOD and COD, also, gave high and variable records. BOD values ranged from 160.72 for pump station water of El Mandora, drain No 9 to 650.11 for sample of Kafr El- Zaiat ganag drain. Concentrations of COD ranged from 213.73 for water of pump station No 8 (lower drain) to 1235.1 for Kafr El-Zaiat ganag drain. From the results of this study, I was evident that the water of these drains are highly dangerous on the environment and human health when used as it is without good treatment. E.coli sp ,Salmonilla sp and Shigella sp showed huge numbers in waste water.
Keywords: (Salmonilla Shigella heavy metals drains Egypt)
