A rapid sand filter is to be provided in a water treatment plant, to process 60 MLD of water for a town. There is a provision of allowing 3% of the filtered water for storage to meet the backwashing requirement. Rate of filtration for the filter system is 20 m³/m²/hr. Each day 20 min of backwashing is done. Then, (A Flow of water during filtration is laminar flow and flow of water in case of backwashing is turbulent. The area of filter unit is 128.75 m² C The area of filter unit is 130.55 m² Correct Option Rapid sand filter is less efficient in removing bacteria. Correct Option

A rapid sand filter is to be provided in a water treatment plant, to process 60 MLD of water for a town. There is a provision of allowing 3% of the filtered water for storage to meet the backwashing requirement. Rate of filtration for the filter system is 20 m³/m²/hr. Each day 20 min of backwashing is done. Then, (A Flow of water during filtration is laminar flow and flow of water in case of backwashing is turbulent. The area of filter unit is 128.75 m² C The area of filter unit is 130.55 m² Correct Option Rapid sand filter is less efficient in removing bacteria. Correct Option

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 rapid sand filter is to be provided in a water treatment plant, to process 60 MLD of water for a town. There is a provision of allowing 3% of the filtered water for storage to meet the backwashing requirement. Rate of filtration for the filter system is 20 m3/m2/hr. Each day 20 min of backwashing is done. Then, A Flow of water during filtration is laminar flow and flow of water in case of backwashing is turbulent. The area of filter unit is 128.75 m² The area of filter unit is 130.55 m2 Correct Option Rapid sand filter is less efficient in removing bacteria. Correct Option
There is sedimentation tank that is used to remove suspended solid particles from an incoming wastewater stream. The incoming wastewater has a flowrate of 150 m³/hr and the sedimentation tank has a basin surface area of 15 m2. Assume the operation temperature is 25 C and assume that sedimentation is the only process by which suspended solid particle are removed from the sedimentation tank. a) What is the settling velocity of the suspended solids in this sedimentation tank in the unit of m/s
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.
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
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Determine the Aeration Basin Dimensions for a town of 200,000 population. Mixed Liquor Suspended Solids is 3500 mg/L. The BOD Loading rate is 0.48 kg/ (?3 –day), Sludge Volume Index is 120 mL/g; Return sludge is 35%; the concentration of BOD is 0.093 Kg/(Capita –day). Primary sedimentation tank removes 35% of BOD.
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
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.
A sand bed filter is 50 ft in diameter and filled to a depth of 20 ft with sand. The sand particle diameter is 1 mm and the initial bed void fraction is .34. Wastewater containing 1% by volume suspended solids is fed to the filter at a rate of 4500 gpm by a positive displacement pump which can delvier this rate up to a discharge pressure of 45 psig. Determine how long in hours the filtration system can operate before shutting down for backwashing.
The 550-bed Atlanta Hospital has a small, activated sludge plant to treat wastewater from the hospital. The average daily hospital discharge is 1.50 m3 per day per bed, and the average soluble BOD5 after primary settling is 450 mg/L. The aeration tank effective liguid dimensions of 10 m x 10 m x 5 m. The plant operating parameters are as follows: MLVSS - 2,600 mg/L; MLSS - 1.20 (MLVSS); Settling sludge volume after 30 min. = 200 mL/L. The aeration time is nearly?