الفهرس 
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Abstract
Safe disposal of waste water is the most critical environmental challenge facing our government. This study aims to evaluate the performance of aerated lagoon system in Port Said city for removal efficiency of bacteriological and physicochemical contaminants. Variations of bacteriological and physicochemical parameters along the ponds system were observed and evaluated. One year (2018) analysis was done in monthly intervals from January to December. The plant consists of aerated, facultative, and maturation lagoon in series. The study was done by analyzing ten parameters in groups of bacteriological and physicochemical parameters; the microbiological parameters monitored were; heterotrophic plate count (HPC), total coliforms (TC), fecal coliforms (FC), Enterococcus, and Salmonella spp. the physicochemical parameters monitored were; total suspended solids (T.S.S.), biological oxygen demand (BOD5), chemical oxygen demand (COD), ammonia and phosphorus. We targeted on Salmonella spp as a result of Salmonella spp causes numerous infections in humans. Removal efficiency of Heterotrophic bacteria ranged from (52.3-86.9%), (54.1- 93.6%) and (99.5- 99.7) for aerated, facultative and maturation lagoon respectively. Removal efficiency of Total Coliform bacteria ranged from (52.2- 83.3%), (51.6- 91%) and (99- 99.3%) for aerated, facultative and maturation lagoon respectively. Removal efficiency of Fecal Coliform bacteria ranged from (49.7- 81.7%), (48.1-94.2%) and (79.1-99.1%) for aerated, facultative and maturation lagoon respectively. Removal efficiency of Enterococcus ranged from (53.2- 87.7%), (55.5- 98.5%) and (97.7- 98.8%) for aerated, facultative and maturation lagoon respectively. Removal efficiency of Salmonella ranged from (32.5-57.6%), (36.1-66.1 %) and (95.2-99.7%) for aerated, facultative and maturation lagoon respectively. Removal efficiency of T.S.S. ranged from (25.1-43.4%), (37.2- 66.7%) and (19.6- 37.8%) for aerated, facultative and maturation lagoon respectively. Removal efficiency of BOD5 ranged from (28.8- 49.9%), (42.7-76.7%) and (22.5-43.4%) for aerated, facultative and maturation lagoon respectively. Removal efficiency of COD ranged from (34.6-53%), (44.5-77.5%) and (20.6-42%) for aerated, facultative and maturation lagoon respectively. Removal potency of Ammonia ranged from (16.6-37.3%),(25-51.5%) and (13.3- 47.9%) for aerated, facultative and maturation lagoon respectively. Removal efficiency of Phosphorous ranged from (0-12.9%), (8.4- 20%) and (0 - 7.1%) for aerated, facultative and maturation lagoon respectively.