Question 7.7 2.214.50.654.17 Rapid Granular Filtrationd. Design conditions: vp = 25 m/h, media = anthracite, ES = 1.50mm, max available head = 3m (adapted from pilot results forPortland, Oregon's Bull Run water supply).Time toBreakthrough,InitialHead Loss,MediaHead Loss WhenBreakthroughOccurred, mDDepth,Filtermm2.02.32.53.04149550.430.510.510.631.82.02.52.934657-7A monomedia anthracite filter has an effective size of 1.0 mm andmedia density of 1650 kg/m³.a. Calculate backwash rate to get a 25 percent expansion at thedesign summer temperature of 25°C.b. Calculate the expansion that occurs at the backwash rate deter-mined in part (a) at the minimum winter temperature of 5°C.c. Discuss the implications of these results on backwash operationsfor plants that experience a large seasonal variation in watertemperature.7-8Calculate the largest sand particle (specific gravity = 2.65) that wouldbe removed from a filter during backwashing if the backwash rate is45 m/h and the water temperature is 15°C.Akgiray, Ö., and Saatçi, A. M. (2001) "A New Look at Filter Backwash Hydraulics,"Water Sci. Technol. Water Supply, 1, 2, 65–72.Amirtharajah, A. (1988) "Some Theoretical and Conceptual Views of Filtration,"J. AWWA, 80, 12, 36–46.Amirtharajah, A. (1993) "Optimum Backwashing of Filters with Air Scour:A Review," Water Sci. Technol., 27, 10, 195-211.Clark, M. M. (2009) Transport Modeling for Environmental Engineers and Scientists, 2nded., Wiley-Interscience, Hoboken, NJ.Crittenden. J. C., Trussell, R. R., Hand, D. W., Howe, K. J., and Tchobanoglous, G.(2012) MWH's Water Treatment: Principles and Design, 3rd ed., Wiley, Hoboken, NJ.Ergun, S. (1952) "Fluid Flow through Packed Columns," Chem. Eng. Prog., 48, 2,89-94.Ives, K. J. (1967) “Deep Filters," Filtration and Separation, 4, 3/4, 125–135.Iwasaki, T. (1937) "Some Notes on Sand Filtration," J. AWWA, 29, 10, 1592–1602.-234

Data Given: Effective size of the filter D10= 1 mmMedia density = 1650 kg/m3 Asked: Backwash rate…

Answered: 7-7 A monomedia anthracite filter has…

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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Q#3) What is the design criteria for trickling filter.
A class A pan is maintained near a small lake to determine daily evaporation (see table). The level in thepan is observed everyday. Water is added if the level falls near 7 inches. For each day the difference inheight level is calculated between the current and previous day, and the precipitation value is from thecurrent day. Determine the daily lake evaporation if the pan coefficient is 0.75.
a plastic tile drain pipe is installed to carry a design flow from 3000ft of tile spaced 140 ft . if the soil drainable porosity is 0.06 and the drainage coefficinet to drop the water table is 0.21 m/day . and the grade of the tile is 0.2percent . the design discharge (Q) is equal liter/second ?
- A standard evaporaƟon pan at the site indicated a pan coefficient of 0.80 on the basis of calibraƟon against controlled water budgeting method. If this pan indicated an evaporaƟon of 72 mm in the week. estimate the volume of water evaporated for the 15 km2 lake in that week.
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?
A venturi scrubber operates such that Nt =(PT)1/2. At a power input of 4 hp/1000 cfm and an Inlet dust loading of 1.5 gr/ft2 what is the outlet loading?
Estimate the head loss for a bar screen set at a 30° incline from thevertical. The wastewater fow rate is 90,000 m3/d. The bars are 20mm in diameter, with 25 mm clear spacing in between bars. Thewater depth is 1.2 m, channel width is 1.5 m, approach velocity is0.65 m/s, and the head loss coeffcient is 0.65
A bar screen is used to treat 10 MGD of menicipal wastewater. The vertical bars are 1.27 cm wide and 3.8 cm deep. The minimum allowable spacing for the bars is 2.4cm. The appoach channel carries the water at velocity of 0.381 m/s and is 1.07 m wide and 1.37 m deep. 1- detrmine the number of bar and spacing that should be used. 2- calculate the head loss through screen when it is clean (m). 3- it's estimated that the screen will remove 227 kg (wet basis) of screenings ber milion gallons of water treated. What will be the daily accumulation (kg and m^3) of the screening if the density of screening 100 kg/m^3.
a plastic tile drain pipe is installed to carry a design flow from 3000ft of tile spaced 140 ft . if the soil drainable porosity is 0.06 and the drainage coefficinet to drop the water table is 0.21 m/day . and the grade of the tile is 0.2percent . the roughness cofficient (n) is 0.017 . the design diameter of the drain pipe (d) is egual meter ?
Q#2) Explain the design formula for trickling filter.
Design six units of slow sand filter beds for a population of 50,000 with Average daily demand of 150 liters/(capita-day). Rate of filtration is 150 liters/ (m2-hr) and length of each filter unit is twice of its width. Design the system on maximum discharge. Also assume that one unit is out of service.
Calculate effluent B.O.D of a two-stage trickling filter with the following data: Q=3.15 ?3/min, ??= 290 mg/L, V=830 ?3 (each) Filter depth=2 m, ?1=1.25 and ?2=1

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