Aquatic Pollution and Coastal Management

Unit 2 : Sewage and domestic wastes, treatment and reuse

2.5.4.1.Disinfections Treatment
The treated sewage, however, may still contain some pathogenic organisms such as bacteria and viruses. this might affect the human population, if they are likely to be exposed to the effluent that is discharged, as in bathing waters. The disinfection can be achieved by the addition of strongly reactive chemicals such as chlorine, ozone, perchloric acid, etc. But these may react with the constituents of the effluent to yield potentially carcinogenic organochlorines. A safer alternative is to subject the waste to ultraviolet light or continuous microfiltration treatments.