Domestic Wastewater Treatment in Environmental Engineering

1. DOMESTIC WASTEWATER TREATMENT
Dr. G. REDDY BABU
Professor
Dept of Civil Engineering
Gudlavalleru Engineering College
Gudlavalleru - 521356
Andhra Pradesh
India

2.  To remove suspended solids
 To Remove Biodegradable organic matter
 To Kill Pathogens

3. DOMESTIC WASTEWATER TREATMENT UNITS

4.  Wastewater (WW) Mostly collecting by
gravity
 Collecting the WW in a sump and pump it

5. WASTE CLASSIFICATION

6. Suspended solids 10-1 To 10-3 mm
Colloidal solids 10-3 To 10-6 mm
Dissolves solids 10-6 To 10-8 mm

7. SCREEN
 To removal of floatable /large objects

8. GRIT CHAMBER
 To remove grit (Inorganic solids)
 ( Grit from street ww), specific gravity = 2.65
 No removal of organic suspended solids

9. PRIMARY SEDIMENTATION TANK
 To remove suspended solids (only by
gravity, no other force here)
 Inorganic and organic S S are removed
 Inorganic (SS) whose sp gr << 2.65 are
removed.
 However, 60% S S removal and 30%
BOD removal( suspended organic
solids)

10. BIOLOGICAL WASTEWATER TREATMENT
 Removal of Organic solids
 Suspended organic matter( in colloidal
form eg: protein)
 Dissolved organic matter (OM)
 eg:( carbohydrates)

11.  Dissolved oxygen is supplied by
aerators
 Microbes in WW
 More cells in flocculating biomass
(settle by gravity) in SST)

12. AEROBIC MICROBIAL SYSTEM
 (Aerators are present)

13. SECONDARY SEDIMENTATION TANK(SST)

14. TERMINAL TREATMENT
 Disinfection
 To kill pathogens
 Chlorination or UV

15. PRIMARY TREATMENT

17. SECONDARY TREATMENT

18. SECONDARY TREATMENT

21. SLUDGE TREATMENT

22. ANAEROBIC DIGESTION

23. THANK YOU