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The River Buriganga is the life line of the Dhaka city and flanked in its southern side. The aerobic heterotrophic bacterial count of the River Buriganga was found to be in the range of 1.0 × 10 5 to 42.0 × 10 5 cfu/ml while enteric bacterial counts on SS agar and MacConkey agar were 0.1 × 10 4 to 39.0 × 10 4 cfu/ml and 0.3 × 10 3 to 3.5 × 10 4 cfu/ml samples, respectively. Out of 74 isolates, 5 Gram-positive (22%) and 18 Gram-negative (78%) bacteria were randomly selected for detailed study. Bacillus was the dominant among the Gram-positive bacteria. Eighteen Gram-negative enteric isolates belonged to the genera Enterobacter ( E. amnigenus and E. intermedium (44%), Alcaligenes (28%), Salmonella (17%), Escherichia (5.6%) and Plesiomonas ) (5.6%). The NO 3 -- N, NO 2 -- N and phosphorus concentrations were found to be below the safety level from pollution point of view. BOD and COD values along with the presence of different bacteria clearly indicated that the River Buriganga was polluted with the organic, chemical and bacterial pollutants. Key word s: Bacteria; Buriganga River; Enteric bacteria; Pollution; Bangladesh DOI: 10.3329/bjb.v38i1.5128 Bangladesh J. Bot. 38 (1): 87-91, 2009 (June)

Bacterial load and chemical pollution level of the River Buriganga, Dhaka, Bangladesh