"isolation and identification of bacteria present in the activated sludge unit, in the treatment of industrial waste water "

activated sludge or extended aeration treatment involves a continous system where aerobic biological growths are mixed with waste water and then separated in a gravity clarifier. therefore, waste treatment system such as the activated sludge system depend on the activities of communities of living organism. in this study, an attempt was made on the indentification of the bacterial population involved in the laboratory activated sludge unit. the results showed that gram-negative bacilli with a yellow pigment was considered as a major group of the population.