3.3 Three grit chambers are currently used to treat grits in a WWTP. Each channel is 2.5 ft wide and has a water depth of 2 ft. What is the velocity when the influent flow rate is 12 ft³/sec? a) 1.75 ft/sec b) 0.74 ft/sec c) 1.05 ft/sec d) 0.80 ft/sec 3.4 You performed settling test and found 600 mL settled after 30 min. If the MLSS in the aeration basin was 3000 mg/L, do you have problem? a) yes b) no c) no enough info. d) need to redo test
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- A municipal water treatment plant employs two circular primary clarifiers arranged in parallel, following the bar screen and grit removal chamber. The plant receives 5.0 MGD. Each clarifier is center-fed (water enters at the center and exits at the perimeter). The clarifier radius is 43.0 ft and depth is 10.0 ft. a) What is the hydraulic detention time in each clarifier? b) What is the hydraulic loading rate (critical velocity) in units of ft3/(ft2-hr)?Which of the following apparatus is used for testing the setting time of hydraulic cement? 1. Vicat needle with 1 mm diamter 2. Hydraulic Jack 3. Vicat needle with 10 mm needle 4. Cnnsolidometer2) Upon completion of the excavation, backfilling and compaction works for the proposed road described in problem 1, the gravel bedding and concreting works are to start. Figures below show the detail for the road section. ROAD SECTION -5. 0m- 5.0m 25cm 25cm CONCRETE ROAD (4500 psi @ 28 DAYS) ON 100mm THK COMPACTED GRAVEL BED ... Note: 4500 psi @ 28 days concrete ratio will be taken to be 1:1.75:1.70 + an admixture for strength. (1 cubic meter of concrete for this mix = 13 bags of 40 kg cement, 0.606m3 of crushed sand, 0.588m3 of 3/4" gravel, and an admixture of 2 sachets per bag of 40 kgs cement) *** Gravel bed will be 100mm thick and shall be applied with a 33% increase in volume to consider the effect of compaction. G-1 gravel shall be used. 2.d) Determine the required quantity of 3/4" gravel (m³) 2.e) Determine the required quantity of admixture sachets 2.f) Determine the quantity for G-1 Gravel Bed (m³)
- 2) Upon completion of the excavation, backfilling and compaction works for the proposed road described in problem 1, the gravel bedding and concreting works are to start. Figures below show the detail for the road section. ROAD SECTION -5. 0m- -5.0m- 25cm 25cm CONCRETE ROAD (4500 psi @ 28 DAYS) ON 100mm THK COMPACTED GRAVEL BED *** Note: 4500 psi @ 28 days concrete ratio will be taken to be 1:1.75:1.70 + an admixture for strength. (1 cubic meter of concrete for this mix = 13 bags of 40 kg cement, 0.606m3 of crushed sand, 0.588m3 of 3/4" gravel, and an admixture of 2 sachets per bag of 40 kgs cement) *** Gravel bed will be 100mm thick and shal1 be applied with a 33% increase in volume to consider the effect of compaction. G-1 gravel shall be used. 2.a) Determine the quantity for Concrete (m³) 2.b) Determine the required quantity of cement bags 2.c) Determine the required quantity of crushed sand (m³) 2.d) Determine the required quantity of 3/4" gravel (m³) 2.e) Determine the required…14. Calculate the amount of cement required in cumec for 100 sqm DPC of depth 2.5 cm, Grade 1:2:4.precast concrete pipe is to be constructed under road .if the (DH) = 0.224m, the pipe diameter was 0.75m and n=0.014, (r/R)=0.066, k1=0.25, K2=1.0, K bent =0.75, L=40m, find the discharge 500cumecs 5501/s 500 l/s 0.25cumecs 1.2cumecs
- Will a grit particle with a radius of 0.10 mm and a specific gravity of 2.65 be collected in a horizontal grit chamber that is 13.5 m in length if the average grit-chamber flow is 0.15 m³/s, the width of the chamber is 0.56 m, and the horizontal velocity is 0.25 m/s? Hint: Use the data below S-1 V's= 18 v=0.959 x 10-6 m²/sWill a grit particle with radius of 0.2 mm and specific gravity of 2.8 be collected in a horizontal grit chamber having a 15 m length and a grit flow of 0.15 m3/s and viscosity 0.0011 Pa.s. The width of the chamber is 0.6 m and the horizontal velocity is 0.2 m/s? Q:Estimate the volumetric flow rate (critical flow rate) that should not be exceeded in order to let the particles fall in grit chamber?7.70 If the pipe shown has constant diameter, is this type of HGL possible? If so, under what additional conditions? If not, why not? HGL р Y Z Datum PROBLEM 7.70
- 1. Fineness modulus of the aggregate Weight Retained Individual Cumulative Percent Sieve (g) Percent Percent Passing 4.75mm 31.5 2.36mm 67.6 1.18mm 96.5 600um 111.1 300um 60.5 150um 115.6 75um 17.5 pan 31.5 O a. 2.96 O b. 2.76 O c. 2.54 O d. 2.3421. You have a wellbore that is drilled to 3,298 feet measured depth. Inside it, the customer ran 3,297 feet of 11.75 inch OD, 27 pound/linear foot casing with 11 inch ID. After pumping cement, we will drop a plug and displace to within 80 feet of the bottom of the pipe. How many barrels of displacement fluid do you need? (1bbl =5.6146 cubic feet, 1foot = 12 inches) * 95.0334 3217 80 378.32precast concrete pipe is to be constructed under road .if the (DH) = 0.224m, the pipe diameter was 0.75m and n=0.014, (r/R) =0.066, k1=0.25, K2=1.0, K bent = 0.75, L=40m, find the discharge O 500 l/s O 5501/s O 0.25cumecs 1.2cumecs O 500cumecs