Overview

sewage treatment


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The process of disposing of sewage, i.e., human waste. The waste travels through sewerage pipes to a sewage treatment plant, where it undergoes a series of processes, including moving through settlement tanks where suspended solids are separated from supernatant fluid, then aeration, filtration, a second stage of settlement, sludge digestion and drying into sludge cakes, disinfection of waste water by chlorination, ozonation, or other means, release of pathogen-free water (assessed by the coliform count below a predetermined safety standard), and disposal of the dried sludge, which can be disposed of as fertilizer.

Subjects: Public Health and Epidemiology.


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