Compendium of Projects Exhibited during the 2nd NLEPC - Vol I

WASTE WATER TREATMENT AND
MANAGEMENT
The main steps: The Main steps in typical water –
treatment plants are coagulation , settling and filtration to
remove suspended particles, aeration to remove the
volatile substances most responsible for taste and odour,
and chlorination to kill pathogenic organisms.
Primary Treatment: For the treatment of sewage, primary
treatment consists of mechanical filtration, screening, and
settling, followed by chlorination. It removes 50 to 65% of
the suspended solids.
Secondary Treatment: In secondary treatment, the
organic wastes are transformed by bacteria in the
treatment plant, where oxygen is provided by aeration,
instead of depleting dissolved oxygen in the receiving
waters. The sludge from this process, consisting largely of
bacterial masses, is concentrated and processed further in
an anaerobic digester.
528
2012
nd
2 National Level
Exhibition
& Project
Competitions
Details of the participant
Name
A. Elumalai
Class
IXth
Innovation in Science Pursuit for Inspired Research
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School Name & Address
Ramakrishna Mission High School,
Malliankaranai (Post), Uttiramerur
Name of the Mentor Teacher
D. Sugumar
Name of the District & State
Kanchipuram, Tamil Nadu
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