The following diagram illustrates the operation of a rapid sand filter. Washwater storage tank Water level while filtering E A From coagulation larification bas Sand + Gravel OOO OO Filter rate controller B CO D Water level while washing H B Scai Bottom of washwater trough Washwater rate controller E Lateral drain Filtered water Main drain storage tank Washwater drain The Valve D is to O 1) Control influent water from sedimentation tanks O2) Discharge dirty backwash water 3) Discard the initial filtered water after backwashing and resuming filtration 4) Control the clean backwash water 5) None of the above

The following diagram illustrates the operation of a rapid sand filter. Washwater storage tank Water level while filtering E A From coagulation larification bas Sand + Gravel OOO OO Filter rate controller B CO D Water level while washing H B Scai Bottom of washwater trough Washwater rate controller E Lateral drain Filtered water Main drain storage tank Washwater drain The Valve D is to O 1) Control influent water from sedimentation tanks O2) Discharge dirty backwash water 3) Discard the initial filtered water after backwashing and resuming filtration 4) Control the clean backwash water 5) None of the above

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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The following diagram illustrates the operation of a rapid sand filter. Washwater storage tank Water level while filtering E B A From coagulatin larifica on basi Filtrate controller Bottom of washwater trough Washwater rate controller Lateral drain Seal Filtered water storage tank Main drain. Wasitwater drain During filtration cycle, the valves A, B, C and E open/close as follows: O 1) A and B open and C and E close 2) A and B close and C and E open 3) A and C open and B and E close 4) A and E open and B and C close 5) A and C close and B and E open U Water level while washing Sand Gravel 000 MANSKER
T Settled sludge and filter wash water from water treatment are thickened in Problems 703 clarifier-thickeners prior to mechanical dewatering. The settled sludge volume is 1150 gpd with 1.0% solids, and the backwash is 9800 gpd containing 500 mg/l of suspended solids. Calculate the daily quantity of thickened sludge, assuming a concentration of 3.0% solids
1- - 1/ Question 1 (i) Sketch, label and explain all the different parts in activated sludge system used during secondary treatment of wastewater. Give one (1) important reason why secondary sedimentation tank is normally installed after an activated
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Determine the diameter of a trickling filter for a wastewater flowing at the rate of (13500/100) gallons per minute. The influent BOD (So) concentration for the wastewater is (13500/20)mg/L, whereas desirable effluent BOD should be as per NEQS. Determine: a) Diameter of the trickling filter = _________m b) Depth of the trickling filter = ____________ m
6. After your flash mix the water was sent to a clarification basin that was 24 feet in diameter and 20 feet tall. What was the detention time in hours of 0.43 MGD? 5.4 hours 4.3 hours 3.8 hours 2.3 hours After the water leaves your sedimentation basin, it is ready for filtration. Your two filters measure 10 feet in diameter. What is the filtration rate is gpm for your flow of 0.43 MGD? 19 gpm/sq/ft 29 gpm/sq/ft 39 gpm/sq/ft 49 gpm/sq/ft You have had a filtration breakthrough (failure) and have brought your old roughing filtration system on line. The old filter is 8 feet square and 4 feet deep. What is the filtration rate in gpm/sq/ft for your flow of 0.43 MGD? 10.33 gpm/sq/ft 8.55 gpm/sq/ft 5.99 gpm/sq/ft 4.66 gpm/sq/ft
A 50 mL of wastewater sample was brought to the lab and filtered out to measure the solids concentration. The weights of filter paper before, and after filtration (with solids) are 0.182 g and 0.197 g, respectively. The weights of aluminum cup tare before, and after dry (with solids on filter paper) are 100.08 g and 100.76 g, respectively. What is the total suspended solids concentration (TSS), in mg/L or grams/liter (or, other units)? Show your math-work.
A 25 ml of sewage water sample was refluxed with 10 ml 0f 0.25 N K2Cr2O7 solution. The untreated dichromate requires 6.5 ml of 0.1 N FAS.10 ml of dichromate solution and 25 ml distilled water , under the same condition as sample required 27 ml of 0.1N FAS. Calculate the COD of sewage.
Problem 1 A mechanically cleaned bar screen is used in preliminary treatment for the following conditions: Wastewater flow rate = 100,000 m/d Approach velocity 0.6 m/s Open area for flow through the screen = Head loss coefficient for clean screen Head loss coefficient for clogged screen = 0.60 Incline from vertical = 0° %3D 1.6 m2 0.75 I %3D a. Calculate the clean water head loss through the bar screen. b. Calculate the head loss after 40% of the flow area is clogged with solids.
In rapid sand filters, the flow rate capacity is 0.3 m3/s and the filtration rate is 100 L/m2.min. When one filter is stopped the filtration rate become 150 L/m2.min. If each filter is backwashed for 5 mins and backwash rate is 60 m3/m2.hr. Find the number of filters, area of each filter, percentage of backwash water to filtered water if the filter is stopped 30 min/day. Also, find the diameter of the pipe which transport the backwash water if the designed velocity is 3m/s.
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.
Draw a schematic of a typical secondary wastewater treatment plant using activated sludge treatment. Indicate where sludges are produced and where gases are added.