Turbidity of Water (exp:3) - assignment - Q-A

(1) Q: Discuss the environmental significance of “turbidity”.

Ans: Turbidity is important for water supply engineers as turbid water is not aesthetically acceptable to people. There is always a fear among the people that turbid water may cause diseases. for filtration, turbid water is not suitable as it causes quick clogging of filter bed which necessitates the use of pre-treatment plant. Turbidity is also an important parameter in disinfection process.

Disinfection is usually accomplished by means of chlorine, ozone, or chlorine dioxide. To be effective, there must be contact between the agent and the organisms to be killed. However , in case which turbidity is cause by municipal wastewater solids, many of the pathogenic organisms may be encased in the particles and protected from the disinfectant. Hence USEPA has placed a maximum level of 0.5 to 1.0 units of turbidity depending on the disinfection process used, as the maximum amount allowable in public water supplies.

According to Bangladesh Environment Preservation Act (1997), drinking water standard for Turbidity is 10 NTU.

(2) Q: Why turbidity is important in “filtration” and “disinfection” ?

Ans: Turbidity is important in “filtration” and “disinfection” because; for filtration, turbid water is not suitable as it causes quick clogging of filter bed which necessitates the use of pre-treatment plant.

Turbidity is also an important parameter in disinfection process. Disinfection is usually accomplished by means of chlorine, ozone, or chlorine dioxide. To be effective, there must be contact between the agent and the organisms to be killed. However , in case which turbidity is cause by municipal wastewater solids, many of the pathogenic organisms may be encased in the particles and protected from the disinfectant.

(3) Q: Write down the methods that are commonly used for removing turbidity from water.

Ans: By the following methods are commonly used for removing turbidity:
- Plain Sedimentation.
- Sedimentation with Coagulation.
- Filtration.

Tweet