For the particle-settling data shown in Question 9, plot the removal efficiency as function of overflow rate for overflow rates ranging from 0.5 to 4 m/h. Determine the overflow rate required to achieve 60 percent removal.
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- Q/ A WTP are to be treated 3800 (m/day) is designed as in items below: a) Rectangular sedimentation tank at detention time 2.5 hr., and the smallest particle to be removed 100% is 0.05 mm in diameter (pw =1000 kg/m', uw=1.03X10* kg/m.sec., and Gs=1.2). Design the tank dimension (Length L, Width W, and depth H), check the horizontal velocity Vr, SOR (m/day) and weir loading rate WLR (m'/m'.day)?. b) One rectangular flocculator at dimension (L-10m, W=5m and H=2m), Gt=3600. Find the velocity gradient in this tank?.Q/A WTP are to be treated 3800 (m/day) is designed as in items below: a) Rectangular sedimentation tank at detention time 2.5 hr., and the smallest particle to be removed 100% is 0.05 mm in diameter (pw =1000 kg/m, uw=1.03X10 kg/m.sec., and Gs=1.2). Design the tank dimension (Length L, Width W, and depth H), check the horizontal velocity V , SOR (m/day) and weir loading rate WLR (m/m².day)?. b) One rectangular flocculator at dimension (L=10m, W=5m and H=2m), Gt=3600. Find the velocity gradient in this tank?.A municipal wastewater treatment plant employs three circular primary clarifiers arranged in parallel, following the bar screen and grit removal chamber. The plant receives 12 MGD. Each clarifier is center-fed (water enters at the center and exists at the perimeter).The clarifier radius is 56 ft and depth is 10 ft.What is the hydraulic loading rate (critical velocity) in each clarifier in units of ft3.ft-2.hr-1 ?
- A rectangular sedimentation tank is designed with a depth of 3.5 mand a detention time of 1 h. Is the design suffcient to achieve complete removal of particles with a diameter of 0.01 mm? Specifc gravity of the particles is 2.65. The fow rate and temperature of waterare 10,000 m3/d and 20°C, respectively. At 20°C, density of water is998 kg/m3 and dynamic viscosity of water is 10–3 kg/m·s. State anyassumptions you make to calculate your results.Two sedimentation tanks operate in parallel. The combined flow of the tanks is 0.2 m³/s. The depth of each tank is 3 m and each has a detention time of 2 hrs. During the operation, the operator decided to remove particles that having settling velocity of 0.1 mm/s, 0.4 mm/s and 1 mm/s. What is the percentage of removal that should be expected for each particle in an ideal sedimentation tanks.WW Water Treatment II- 15th May 2022- Third Class- Pollution Control Branch US 3 Q1: AP. 5 Vs Determine the terminal settling velocity for a sand particle with an average diameter of 0.5 mm and a density of 2600 kg/m³ settling in water at 20°C. μ = 1.002 × 10-³ N-s/m² Pw= 998.2 kg/m³ 8(pp-P.) d 18μ U₂ RePwVsdp/H, Cp- = Stock 3 24 + N +0.34
- Q1) Determine the removal efficiency for a sedimentation basin with a critical overflow velocity of 2m³/m².h in treating a water containing particles whose settling velocities are distributed as given in the table below. Plot the particle histogram for the influent and effluent wastewater. Settling velocity ,m/h 0.0-0.5 0.5-1 1-1.5 1.5-2 2-2.5 2.5-3 3-3.5 3.5-4 Total Number of particles per liter × 10-5 30 50 90 110 100 70 30 20 500a.) Which graph best shows the effect of detention in peak flow reduction?dz?? Q3: a- Two sedimentation tanks operate in parallel. The combined flow to the twe tanks is 0.1m /s. The depth of each tank is 2 m and each has a detention time of 2 hr. What is the surface arca of cach tank, and what is the surface overflow rate of each tank in m/(day.m)? b- The recent population of a city is 30000 capita, what is the predicted population after 30 years if the geometric growth rate is 3.5%? 1t- PiK AT 30 (Q- 2リ d-2m AT-2HV A 200000
- QUESTION 4 A settling analysis is run on a Type 1 suspension in a laboratory column with a port of 1.9m below the suspension surface. The data obtained are shown below. Time (min) TSS (conc,mg/L) 0 220 3 116 5 98 10 75 20 35 40 10 60 2 What is the theoretical removal efficiency in a settling basin for an overflow of 440 m2/m.day?H.W: Design a sedimentation tank to be treat 0.10 m³/sec2-5 - Determine the removal efficiency for a sedimentation basin with a critical velocity Vo of 2 m/h in treating a wastewater containing particles whose settling velocities are distributed as given in the table below (sample number to be selected by instructor). Plot the particle histogram for the influent and effluent wastewater. Answer 81% Vavg, m/h No. Particles 0.0 – 0.5 20 0.5 – 1.0 40 1.0 – 1.5 80 1.5 – 2.0 120 2.0 – 2.5 100 2.5 – 3.0 70 3.0 – 3.5 20 3.5 – 4.0 10 4.0 – 4.5 3