VPE 511: Environment and Environmental Hygiene (2+1)

CHEMICAL STERILIZATION OF SEWAGE EFFLUENT

• Pathogenic bacteria, typhoid and paratyphoid bacilli have frequently been isolated from sewage and sewage effluents.
• To make the effluent innocuous disinfectants such as pure chlorine, bleaching powder and chloros (containing 10% available chlorine) added.
• In the case of a ordinary sewage, it has been found that these would have to be added in the proportion of atleast 10-15 parts of available chlorine per million parts of sewage, in addition a long period of contact would have to be allowed.