Question

b. A water treatment plant is to process water to a population of 150000 The following data are furnished to facilitate the design of the rapid sand filter units Average day demand 300 L/cap.d 24h Assume that the maximum day demand 1.5 times the average Number of filter units Rate of filtration: Length: Maximum lateral travel of washwater not to exceed 1 m Rate of backwash: Desirable sand bed expansion: 40% Washwater tank capacity: to wash two filters for 5 min each demand 10 200 m/m2d 1.25 times the width 700l/㎡.min Design the filter bringing out the following Length and width of each filter unit Arrangement of the units Number and location of washwater troughs pacity of washwater tank Marks: 4+6

Answer 1

peaK 座 9:3-150/000× 300 eakF bea 200 ว่า Page No.

1.25 Provicle ie, Size 0.8 6

잊 23G.6 As