BACTERIOLOGICAL AND PHYSICOCHEMICAL WATER QUALITY OF FOUR PONDS OF DHAKA METROPOLIS

The aerobic heterotrophic bacterial count of four pond water samples ranged between 6.92x10(4) and 1.72x10(6)cfu/100 ml. The highest count (1.72x10(6)cfu/100 ml) was recorded in Zahurul Haq Hall pond water. Enteric bacterial count was found in between 1.69x10(4) and 3.31x10(5) cfu/100ml in water samples. A total of 79 isolates were obtained of which 24 were randomly selected for further study. Among them Bacillus, Micrococcus and Planococcus were Gram-positive, while Escherichia, Enterobacter and Klebsiella were Gram-negative. Physicochemical parameters of the ponds satisfied water quality standards except NH4+-N. Among the ponds. CODCr and BOD5 values of the water samples were 18.29-19.75 mg/l and 3.18-6.05 mg/l. respectively. Most of the Gram negative bacteria were found to be multi drug resistant.