In view of difficulties encountered with chlorine as a disinfectant under certain conditions, particularly due to ineffectiveness of the chloramines at high pH, bromine is being evaluated as an alternate or supplement to chlorine for disinfection of treated wastewater. Chlorine and bromine were compared under varying conditions of pH and temperature, using an activated sludge effluent as the test substrate. Both dosage and residuals of chlorine and bromine were being correlated with percent survival of coliforms, fecal coliforms, and total bacterial numbers. Combinations of chlorine and bromine were also evaluated. The advantages of bromine are discussed. (Modified author abstract)