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  Tertiary treatment

Tertiary treatment:

Tertiary treatment is aimed to eliminate non-biodegradable organic materials, heavy metals & minerals. The salts of nitrogen and phosphorus should be eradicated since they cause eutrophication. By employing activated carbon filters the organic pollutants can be eliminated, while by adding lime the phosphorus is precipitated as calcium phosphate.  Nitrogen can be eliminated by volatilization as ammonia at high pH values. Ammonia can be transformed by chlorination to dichloromine that in turn is transformed to nitrogen. The final step in sewage treatment is disinfection designed to kill pathogenic micro-organisms. Disinfection is accomplished by chlorination employing chlorine gas or hypochloride. They react with water to outcome hypochlorous acid that is a strong oxidant and antibacterial agent. The treated water can be employed. Tertiary treatment is much expensive.

Eutrophication:

Water, having optimum nutrients, enriched with organic and inorganic nutrients, is referred as eutrophy. The enriched nutrients permit extreme growth of algae and water plants and that condition is termed as Eutrophication. It causes depletion of oxygen, foul smell via generation of sulphides and death of non-resistant organisms. It outcomes in the colonization of such water by a specific group of organisms, cause sedimentation and ultimately gets filled with resistant kind of organisms.

 

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