Drinking water qualities of different purification systems in Ismailia governorate

ABSTRACT

This study monitored ten drinking water treatment systems; three compact, two small filtration and five conventional. The bacteriological, chemical and physicochemical qualification of water was achieved at the inlet, pre-and post-chlorination. The counts of total viable bacteria, total coliform, fecal coliform, coliform streptococci, Salmonella, Shigella and Aeromonas were considered as the most reliable bacterial parameters for water potability. A total of 613 bacterial isolates was identified and found to belong to 18 genera and 21 species; most of them have pathogenic capabilities and free chlorine resistance reached 5 mg/l for 85 isolates. 30% of them represented Bacillus species, 15% Staphylococcus, 12% Escherichia and 10% Corynebacterium. Other 14 bacterial genera were distinguished in this survey