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close this book Water purification, distribution and sewage disposal for Peace Corps volunteers
close this folder Section 2: Water treatment
View the document Overview:
View the document Self purification
View the document Basic steps in treating water
View the document Sample designs for treatment systems
View the document Lesson plans


When the source of water supply is not entirely satisfactory treatment is necessary to insure that the quality of the water meets certain requirements. The trainees are instructed in the basic requirements of water treatment and receive detailed plans for the installation of two simple yet effective treatment systems.



Determine which of the potential water supply sources are the most economically feasible in terms of any treatment process requirements.


1. Define minimal standards of concentration for each pollutant.

2. Identify the nature and extent of pollution for each water supply source.

3. Determine which type of treatment system would most probably be necessary to reduce the pollution level of each source to a safe level.

4. Determine the cost of a treatment process or processes for each source.

5. Select the most economical source(s) in terms of capacity to serve appropriate numbers of people, and treatment process requirements.


1. Describe the four methods used in treating polluted water.

2. Identify the relative costs of different types of treatment systems.

3. Know the effect various pollutants have on different delivery systems.

4. Know what pollutants make water esthetically objectionable.

5. Know what concentrations of chemical pollutants and coliform bacteria constitute health hazards.

6. Identify the factors that influence the future population trends of a given locale.

7. Recognize the relationship between number of water system users and treatment process capacities,


1. Given the designs for various types of treatment systems, calculate with reasonable accuracy the cost of each.

2. Given a list of pollutants, correctly list after each one, if applicable:

a. in what circumstances it can contribute to the destruction of a delivery system.

b. in what concentration it makes water esthetically objectionable.

c. in what concentration it constitutes e health hazard.