SEMESTER:4TH
SUBJECT:SANITARY ENGINEERING
UNIT/CO-4
TITLE OF THE UNIT: SEWAGE TREATMENT AND DISPOSAL
TOPIC: LAYOUT OF TREATMENT PLANT
LAYOUT OF TREATMENT PLANT
FUNCTIONS OF TREATMENT UNITS
1. Screens: To eliminate large
floating matter
2. Grit chamber: To eliminate large
size organic and inorganic matters
3. Skimming Tank: To eliminate grease, oil, soap, etc.,
4. Primary sedimentation Tank: To eliminate suspended particles
5. Aeration tank:
a) It brings sewage in intimate contact with air
b) It helps to absorb oxygen to from air
c) It helps the bacteria to break up the organic matter quickly.
6. Secondary sedimentation tank:
a) It removes very fine suspended particles with the help of coagulants
b) It produces activated sludge which is very effective in oxidizing the organic matter
7. Sludge digestion Tank:
a) It breaks the organic matters into liquid and simple compounds
b) It reduces the volume of sludge
c) It converts the sludge into fertilizer
8. Dosing Tank:
a) It provides uniform spreading arrangement of sewage over the trickling filter
b) It provides intermittent dosing of sewage
9. Trickling Filter:
a) It removes the total solids of sewage
b) It reduces the B.O.D.
c) It gives clear effluent
10. Chlorination of sewage:
a) It disinfects the sewage
b) It prevents the corrosion of sewers
c) It prevents the growth of algae and other plant life in sewers
d) It produces gases which may be used as fuel
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