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Environmental Enigneering 2 - Sewer Design

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Unit-2 SEWER DESIGN 1. What are the Demerits of chemical precipitation? 1. 2. 3. 4. High cost of chemicals Large quantity of sludge which offers difficulty of its removal Skilled attendance Putrescible efficient 2. What do you mean by chemical precipitation? When certain chemicals are added to, sewage they produce a precipitate known as flow which in insoluble or slightly soluble in water. The flow attracts small particles to form large size and thus size goes on increasing during the process of settlement. 3. Write the expression for finding out the settling velocity? Vs Ss 1 d2 18 For particle < 0.1 mm Where Vs Settling velocity in m/s Unit t of water in leg / m3 Absolute or dynamic velocity on kg sec / m 2 d die of particle in m 4. Write the hazen formula for determining the velocity? Vs 418 Ss 1 d 3T100 70 Where Vs Velocity in m/s d dia of particle in m T Temperature in C ( For particles between 0.1 mm and 1mm ) 5. What is do you mean by transitional setting zone? Grit particles however, generally lie between 0.1mm and 1 mm, and hence undergo settling which lies in between streamline settling and turbulent settling. This settling zone is called the transitional settling zone 6. What are the users of Baffle? 1) Baffler are required to prevent the movement of organic matter and its escape along with the efficient 2) Distribute the sewage uniformly through the cross section of the tank. 3) It is used to avoid short circuit ...
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