الفهرس | Only 14 pages are availabe for public view |
Abstract This study aimed to compare and monitor the quality of treated water between two different sewage treatment plants in Menoufia governorate (Quesna activated sludge and Berket El Sabee trickling filters plants). This study was carried out in the period of December 2015 to November 2016. The results of the study showed a significant increase in the determinants of pollution in the influent water of plants under study. It is a predictable result of untreated wastewater and reflect the danger of discharge of this water to water bodies without treatment. A total of twenty-one parameters were assessed in the physico-chemical analysis of the water samples. Most water samples exceeded the permissible limits in Egyptian code physico-chemical standard for wastewater, except temperature, pH, total dissolved solids, sulphide and heavy metals. All raw sewage and treated water samples of two WWTPs were positive for total coliform, fecal coliform and E. coli bacteria. The seasonal variations showed that indicator bacteria have different variations during the period of study. In this study different individuals of zooplankton (Protozoa and rotifers) vary in their response to seasonal changes in the physical and chemical nature of water. It was highlighted on some of pathogenic free-living Amoebae (Acanthamoeba - Naegleria) in treated water samples because they are important in maintaining the occupational safety of plants’ workers. Finally, the performance of Quesna WWTP, works by activated sludge system, has more efficiency in treatment of wastes than Berket El Sabee WWTP which works by trickling filter system. So, it could be possible to recommend the replacement of the trickling filters by the activated sludges to obtain the more better wastewater treatment. |