Abstract
Recent concern over pollution of the environment with heavy metals extends to natural waterways and water treatment systems. Extensive use of heavy metals by industry has resulted in the presence of significant concentrations of these potential intoxicants in sewage treatment influents, effluents and receiving water resources (NYTELKA et al., 1973). Evaluation of the effects of such metals on natural and artificial water systems should include the study of biological phenomena such as nitrification. This study was an effort to determine the effects of chromate and cadmium on the number of nitrifying bacteria obtained from activated sludge samples. Most probable number (MPN) estimates of these bacteria were made in media containing several concentrations of K/sub 2/CrO/sub 4/ and CdCl/sub 2/.
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