Plain Sedimentation Video Lecture | Environmental Engineering - Civil Engineering (CE)

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1. What is plain sedimentation in civil engineering?
Ans. Plain sedimentation in civil engineering refers to the process of allowing suspended particles in water to settle down by gravity. This method is commonly used to remove solids from water or wastewater before further treatment or disposal.
2. How does plain sedimentation work in water treatment?
Ans. In water treatment, plain sedimentation involves allowing water to stand in a sedimentation tank or basin. As water remains still, suspended particles settle down due to gravity, forming a sludge at the bottom. The clarified water is then collected from the top and further processed for purification.
3. What are the benefits of using plain sedimentation in water treatment?
Ans. Plain sedimentation offers several benefits in water treatment. It helps in removing large and heavy particles, such as sand, silt, and organic matter, from the water, improving its clarity and reducing turbidity. This process also aids in the removal of certain pathogens and reduces the load on subsequent treatment units.
4. Are there any limitations to using plain sedimentation in water treatment?
Ans. Yes, there are limitations to using plain sedimentation in water treatment. It is not effective in removing smaller particles, dissolved substances, or certain types of pollutants like dissolved metals or chemicals. Additionally, the process requires a significant amount of space for sedimentation tanks, making it impractical for certain water treatment facilities.
5. How can the efficiency of plain sedimentation be improved in water treatment?
Ans. The efficiency of plain sedimentation can be improved by adding chemicals known as coagulants to the water. Coagulants help in destabilizing fine particles, allowing them to come together and form larger flocs that settle more easily. This process, known as coagulation-flocculation, enhances the sedimentation process and improves the overall removal of solids from the water.
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