Disposal of Sewage and Sludge

This blog post discusses the methods used to dispose of sewage and sludge. The two main methods are dilution and effluent irrigation.

Dilution involves releasing sewage into a body of water, while effluent irrigation involves spreading sewage on land. The conditions that need to be met for successful dilution include having fresh sewage, a high dissolved oxygen content in the dilution water, and a large body of water to release the sewage into.

The natural forces of purification that help to remove pollutants from sewage include dilution and dispersion, sedimentation, oxidation-reduction in sunlight, oxidation, and reduction.

Questions

1. What is the definition of “dilution factor”?
2. What are the methods adopted for sewage disposal?
3. What are the conditions adopted for disposal by dilution?
4. What are the natural forces of purification?

Answers

1. The dilution factor is the ratio of the quantity of the diluting water to that of the sewage.
2. The methods adopted for sewage disposal are dilution and effluent irrigation.
3. The conditions adopted for disposal by dilution are that the sewage must be fresh, the dilution water must have a high dissolved oxygen content, and the outfall sewer must be located near a large body of water.
4. The natural forces of purification are dilution and dispersion, sedimentation, oxidation-reduction in sunlight, oxidation, and reduction.