This document discusses the design of a sewage treatment plant for the town of Ulavapadu, India to address the problems of increasing pollution and diseases due to rising population. The author analyzes the current sewage parameters and designs the treatment plant with primary, secondary and tertiary units including screens, grit chambers, sedimentation tanks, aeration tanks and sludge digestion. The plant is designed to treat the sewage of the projected future population of 26,710 people over the next 40 years.

1. DESIGN OF DOMESTIC SEWAGE
TREATMENT PLANT FOR A
GROWING TOWN ULAVAPADU,
ANDHRA PRADESH, INDIA.
By
Ravi Kumar GARRE
Asst. Professor
KGR-CET

2. SUMMERY OF WORK
 Aim: to design sewage treatment plant for sewage
 Object: to control pollution of water bodies and to
control waterborne diseases
 Inspiration: steady increase in population increases
sewage generation, need STP.
 Design of STP: includes primary, secondary and tertiary
units
 Conclusion: by execution of this project the entire
sewage of the town can be treated effectively and
efficiently.

3. CONTENTS
 Introduction
 About Ulavapadu
 Experimental Methodology
 Design parameters
 Design units
 Conclusion
 References

4. INTRODUCTION
Necessity of treatment of sewage:
 Sewage contains unwanted gases, organic matter,
microorganism, etc.
 Biodegradation, odours, waterborne diseases,
environmental pollution, etc.
 Important parameters need to assess: acidity,
alkalinity, total solids, sulphur compounds, carbon
compounds, nitrogen compounds, COD, BOD,
evolution of gases like, H2S, CO2, forms of nitrogen
due to biological actions and changes in
temperature.

5. SEWAGE TREATMENT PLANT

6. ABOUT ULAVAPADU
 Ulavapadu is a town, Prakasam district, AP.
 Plain Environment throughout the year.
 at the altitude of 15.16670N latitude and 80.00E
longitude.
 As per 2011 census, population: 13,106 and in
2018: 14,000 approximately.
 Due to increase in sewage generation and due to
increase in waterborne diseases in the town, we
decided to propose a waste management system.
 This paper only deals with design STP in the waste
management.

7. EXPERIMENTAL METHODOLOGY
Survey on basic features of the town
 Population growth rate
 Culture, living style and economic status of local people
 Climate
 Site selection for STP
Analysis of physico-chemical parameters of sewage
pH, BOD, COD, Oil&grease, Total Suspended solids, Nitrogen,
Ammonia nitrogen, total phosphorous, total coliform.
Deciding various units to design
screens, grit chambers, primary sedimentation tank, aeration tank,
secondary sedimentation tank, sludge digestion tank in order.

8. PHYSICO-CHEMICAL PARAMETERS OF SEWAGE
Parameters Values of raw sewage
pH 6.4
BOD 300 mg/l
COD 600 mg/l
Oil & Grease 50 mg/l
Total suspended solids 600 mg/l
Nitrogen 61 mg/l
Ammonical nitrogen 50 mg/l
Total phosphorous 5 mg/l
Total coliform 100000 MPN/ml

9. DESIGN PARAMETERS
 Design period: 40 years
 Population forecast: 26, 710
 Per capita water supply: 135 lpcd
 Max. sewage to be treated per day: 0.1 cumecs
 Primary units: screens, grit chamber, sedimentation
tank
 Secondary units: aeration tank, secondary
sedimentation tank
 Tertiary units: sludge digestion tank

10. DETAILS OF RECEIVING CHAMBER
 Design flow = 0.1
cumecs
 Detention time = 60
seconds
 Volume = 6 m3
 Provided: length =
2m, width = 1m and
depth = 3m

11. DETAILS OF SCREEN DESIGN

12. DETAILS OF GRIT CHAMBER

13. DETAILS OF PRIMARY SEDIMENTATION TANK

14. DETAILS OF BIOLOGICAL TREATMENT

15. DETAILS OF SECONDARY SEDIMENTATION
TANK

16. DETAILS OF TERTIARY TREATMENT

17. CONCLUSION
 Since, in Ulavapadu there is no proper treatment plant for
sewage, it is necessary to construct a Sewage Treatment
Plant.
 The plant is designed perfectly to meet the future
expansion for the next 40 years.
 This project consists of the design of the complete
components of a Sewage Treatment Plant from receiving
chamber, screening chamber, grit chamber, skimming
tank, sedimentation tank, secondary clarifier, active
sludge tank and sludge drying beds for sewage.

18. REFERENCES
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publishers.
2) Elements of Environmental Engineering by K.N.Duggal, S.K.Gargh, S.Chand
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