Q #2 Design A rapid sand filter to serve a little city with an annual water consumption rate of 5.475x10° L, considering 5% of the filtered water is used for backwashing. The filtration rate is 4 m³/hr/m² the Backwashing time is 30 minutes. Assume L=2B a) Find the L and B for the filter b) Backwashing rate (m³/hr/m²) the disinfection

Q #2 Design A rapid sand filter to serve a little city with an annual water consumption rate of 5.475x10° L, considering 5% of the filtered water is used for backwashing. The filtration rate is 4 m³/hr/m² the Backwashing time is 30 minutes. Assume L=2B a) Find the L and B for the filter b) Backwashing rate (m³/hr/m²) the disinfection

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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filtration system in a water treatment plant consists of four (4) filter boxes of the size = 45m^2 design flow= 40000 m^3/d. The filter bed is uniform with particles of size 0.50 mm, with specific gravity of 2.6, a porosity of 0.4. and a bed thickness of 0.75 m. Normally, the Reynolds number for flow through a rapid sand filter media is less than 5. ii. Check that the conditions satisfy the low Reynolds number condition. iii. Determine the expected head if clean water is passed through the filter at the design flow.
The discharge of water collected from a constant head permeameter in a period of 15 minutes is 500 ml. The internal diameter of the permeameter is 5 cm and the measured difference in head between two gauging points 15 cm vertically apart is 40 cm. Calculate (a) the coefficient of permeability (mm/s), (b) If the dry weight of the 15-cm long sample is 4.86 N and the specific gravity of the solids is 2.65, calculate the seepage velocity (mm/s).
. A filtration system in a water treatment plant consists of four (4) filter boxes of the size = 45m^2 design flow= 40000 m^3/d, also obtained from Table 2.1. The filter bed is uniform with particles of size 0.50 mm, with specific gravity of 2.6, a porosity of 0.4. and a bed thickness of 0.75 m. Normally, the Reynolds number for flow through a rapid sand filter media is less than 5. ii. Check that the conditions satisfy the low Reynolds number condition. iii. Determine the expected head if clean water is passed through the filter at the design flow.
By keeping the water level constant at 42 cm according to the sample subcode, a permeability test with a permeability cell of 8 cm diameter was carried out in a laboratory environment with a temperature of 20 0C. As the pure water collected during the 1 minute measurement after the steady flow observed in the experiment is as given in the form; Evaluate the permeability of the floor by finding the permeability coefficient in cm / sec.
A drainage pipe became completely blocked during/ a storm by a plug of sand, 1.5 m long, followed by another plug of a mixture of clays, silts and sands, 0.5m long, as shown in the attached figure. When the storm was over, the water level above ground was 1 m. The coefficient of permeability of the sand is 2x that of the mixture of clays, silts and sands. a. Calculate the pore water pressure at the center of the sand plug in kPa
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Consider the removal of soil particles in a settling basin. The particles have a density of 1.3 g /cm3. The diameter of the particles is 10 μm. The treatment plant makes 2 MGD a day. You propose using a circular basin where water enters the center and exits at the edge. What diameter basin is required given a 3.5 meter basin depth and water temperature of 15 ˚C
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