Sanitary Engineering (ENCE 305): Chapter 7 Wastewater Disposal Notes 2025
Wastewater Disposal Notes
SANITARY ENGINEERING (ENCE 305)
Chapter 7: Wastewater Disposal
5 Hours 6 Marks

Wastewater Disposal Notes

About this Chapter

This document contains the complete notes for Chapter 7: Wastewater Disposal of Sanitary Engineering. Understanding the necessity, objectives, and methods of wastewater disposal is essential for civil and environmental engineers in designing safe and sustainable systems.

In this chapter, students will learn about national effluent discharge standards, wastewater disposal by dilution, self-purification of rivers and streams, the oxygen sag curve, the Streeter-Phelps equation, and various land treatment methods including sewage farming and spray irrigation.

Syllabus: Wastewater Disposal

7. Wastewater Disposal
5 hours
6 Marks

7.1 Necessity and objectives of wastewater disposal.

7.2 National effluent discharge standards and provisions.

7.3 Wastewater disposal methods: Dilution and Land treatment.

7.3.1 Wastewater disposal by dilution process and essential conditions for dilution:

Self-purification of rivers/streams; Factors affecting self-purification (Dilution, current, sunlight, sedimentation, temperature, oxidation, and reduction); Oxygen sag curve; Streeter-Phelps equation (Derivation not required).

7.3.2 Wastewater disposal by land treatment:

Suitability of land treatment; Methods of land treatment (Irrigation, overland flow, rapid infiltration, broad irrigation, and sewage farming); Methods of application of sewage on land (Flooding, surface irrigation, ridge and furrow method, subsurface irrigation, and spray irrigation); Sewage sickness and its prevention.

Notes by Madan Gorathoki Sir

Notes by Er. Mahadev Singh Saud

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Disclaimer

Special thanks to Madan Gorathoki Sir and Er. Mahadev Singh Saud for providing these valuable notes.

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