A system of rapid sand filters are designed to cater to a population of 2 million with an average demand of 200lpcd. Backwashing is done daily for 30min and it consumes 5% of filtered water each day. Design loading rate onto the filters is 5000- 0-1/2/h. m Taking a peak factor of 2 for the water demand, the surface area requirement for the treatment of water is

A system of rapid sand filters are designed to cater to a population of 2 million with an average demand of 200lpcd. Backwashing is done daily for 30min and it consumes 5% of filtered water each day. Design loading rate onto the filters is 5000- 0-1/2/h. m Taking a peak factor of 2 for the water demand, the surface area requirement for the treatment of water is

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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A system of rapid sand filters are designed to cater to a population of 2 million with an average demand of 2001pcd. Backwashing is done daily for 30min and it consumes 5% of filtered water each day. Design loading rate onto the filters is 1 5000/h. m Taking a peak factor of 2 for the water demand, the surface area requirement for the treatment of water is
What is the rapid sand filter surface area required for filtering of 10 MLD water assuming a filtration rate of 100,000 litre/m²/day? 100m² 10m² O-1m² 1000m²
A rectangular sedimentation tank following coagulation- Exa flocculation is to treat a flow of 3000 m³ / day with a detention time of 6 hours. It is to be hand cleaned of sludge at 6 week intervals. The suspended solids concentration of the water is reduced from 250 mg/L to 5 mg|L by coagulation- flocculation. The settled sludge includes 40 mg/L (based on water flow) of metallic precipitate and has a moisture content of 85% and specific gravity of 1.24. Determine the volume of sludge produced between cleanings and the basic dimensions of the tank if the water depth just before cleaning is 3 m and its length is twice its width.
The design capacity of the waterworks is 0.30 m³/s. Design the number and size of filters and calculate normal filtration. 2. A sieve analysis curve of a typical filter sand gives dgo= 0.99mm and UC = 1.38. What are its d10 and deo?
(b) Design a slow sand filter to treat a flow of (96) ft3/day? Assume a filtration rate of 0.16 m/hr.
A rapid sand filter is designed to treat (18000 m³/day) of rate of (1.8 l/m².sec). The filter contains (0.6m) of sand with particle diameter of (0.5mm) and the porosity of the sand bed is (0.4) at temperature of 15 °C, Determine: 1)The initial head loss and pressure. 2) The size and number of units required of sand filter.
Water treatment plant : SOR = 0.35 mm/sec; The analysis of this water found that there are 6 different particle sizes: 0.1 mm with settling velocity of 0.2 mm/sec; and percentage of particles = 10 %; 0.2 mm with settling velocity of 0.25 mm/sec; and percentage of particles = 20 %; 0.3 mm with settling velocity of 0.3 mm/sec; and percentage of particles = 15 %; 0.4 mm with settling velocity of 0.35 mm/sec; and percentage of particles = 5 %; 0.5 mm with settling velocity of 0.4 mm/sec; and percentage of particles = 30 %; 0.6 mm with settling velocity of 0.5 mm/sec; and percentage of particles = 20 %; Calculate the efficiency of this tank ?
1. DLSU D is to install rapid sand filters downstream of the settling tank. The design loading rate is selected to be four times the surface per filter which is limited to 45 m?. The design capacity of the waterworks is 0.30 m³/s. Design the number and size of filters and calculate normal filtration. 2. A sieve analysis curve of a typical filter sand gives dgo= 0.99mm and UC = 1.38. What are its d10 and deo? 3. Troughs are 30ft long and width is 20% less than it length and one fourth of length is the measure to the center with horizontal flat bottom. The backwash rate is 24 in/min. Estimate (1) water depth of the troughs with free flow into the gullet, and (2) the distance between the top of the troughs and the 30-in sand bed. Assuming 40% expansion and 6in in free board in the troughs and 8 in of thickness. 4. Estimate particle size of ilmenite (sg 2x sand =5.4) and anthracite (s.g. 2/3 of sand = 1.8) which have settling velocity of silica sand 0.80 mm in diameter (s.g. 2.7).
Q1: Find the area of rapid sand filters and find the dimensions (W and L) for each filter (if fivé units are used), for the followings: • Maximum daily demand is (12 x 10° l/day). • Assume rate of filtration is (4500 l/m².hr). Water required for backwash is (3%) of maximum daily demand. Assume (30) minutes required for stopping backwash and returning'the filter to service. Use L=1.3 W A = rate of filter
A rapid sand filter has a filtration rate of 6 m/h and is used to filter 97 MLD water daily. The filter bed has a width of 5.2 m and length/width ratio of 1.35 m. Calculate the number of filter beds required if there is a water loss of 5% occurs during backwashing and an extra filter bed is to be provided for break-down and maintenance.
A system of rapid sand filters are designed to cater to a population of 2 million with an average demand of 200 lpcd. Backwashing is done daily for 30 min and it consumes 5% of filtered water each day. Design loading rate onto the filters is 5000 1/m²/h. Taking a peak factor of 2 for the water demand, the surface area requirement for the treatment of water is
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