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Other Disinfecting Agents of Sewage Water - Recently it has been found that the chlorinated waters have a serious impact on the aquatic life of the receiving waters. As a result of this, disinfection alternatives have been developed. However certain treatment plants continue to use chlorine with a dechlorination step before discharge into water bodies.

The newly developed processes employ ozone and ultraviolet rays for disinfection. Ozone, a powerful oxidising agent, is mainly used in the oxidation of certain industrial wastewaters which can not be treated effectively by conventional biological oxidation processes.Ultraviolet radiation, a kind of electromagnetic radiation, can also be used for disinfecting wastewaters before discharge.