Assume that concentration is directly proportional to flow rate (i.e., C=KQ). Determine and plot the pollutograph [mg/L vs. min] and the sedimentgraph [kg/sec vs. min] for a total sediment load of 1150 tons for the following runoff hydrograph. [Hint: you need to determine a value for K with units of mg/sec/(cfs)2]. Time (min) Flow Rate (cfs) 0 30 60 90 120 150 180 0 45 190 375 285 95 0 As a check, determine and report the total sediment load from the sedimentgraph.

Assume that concentration is directly proportional to flow rate (i.e., C=KQ). Determine and plot the pollutograph [mg/L vs. min] and the sedimentgraph [kg/sec vs. min] for a total sediment load of 1150 tons for the following runoff hydrograph. [Hint: you need to determine a value for K with units of mg/sec/(cfs)2]. Time (min) Flow Rate (cfs) 0 30 60 90 120 150 180 0 45 190 375 285 95 0 As a check, determine and report the total sediment load from the sedimentgraph.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter8: Seepage

Section: Chapter Questions

Problem 8.11P

See similar textbooks

Similar questions

Q1) The data in the table below used to design a sedimentation tank with depth=4m and detention time=2hr, the influent flow is 2000L for each minute. 0.004 0.01 0.02 0.03 0.04 0.05 0.063 0.085 0.12 Settling Velocity(cm/sec) Weight fraction 98 95 Greater than size % 8 6 4 3 2 1 0.5 Determine the overall removal efficiency for this tank, s.g. of particle=1.2 u=0.89x10-³N.s/m². Use Ax=0.1. Q2) For the above question find the depth of sludge for each day if the influent solid concentration is 3000mg/L and percentage of solid=8% and sludge density =1.2 ton/m³.
A water treatment plant processes 21,000 cubic meters of water per day. Assume two types of flocculated particles enter the basin. You are asked to evaluate the performance of a rectangular sedimentation basin that has dimensions of depth=4 m, width= 6 m, and length= 40 m. The first type of particles has a settling velocity of 0.5 m/hr and the other type has a settling velocity of 1.8 m/hr. What percent of particles are removed for each of the two types of particles?
Еxample A rectangular sedimentation tank with W=25m, L=50m and h=3m. The flow rate = 1500 m/h, and the influent particles concentration = 2000mg/l. The following table shows the percentage of particles as a function of his diameter: Volume of particle (mm) 0.001 10 0.005 20 0.01 15 0.015 15 0.02 20 0.025 20 Find: 1) Settling velocity, if particles density = 2650 kg/ m’ and viscosity of water = 1.002*10*N.s/m? 2) Percentage removal for each particle and total percentage removal 3) Sludge depth, if the tank is cleaned one time per month. If percentage of solide = 8% and sludge density = 1150 kg/ m³ 4) Effluent concentration particles
Example 1: Design a rectangular sedimentation tank to treat 393 m3/hr flows. Assume the smallest particle to be 100% removed is 0.03 mm in diameter, detention time = 3hr, inlet flowing velocity = 0.15 m/min, temperature= 20 °C and Gs= 1.65. Find: 4) The dimensions of a circular sedimentation tank for the same example. H.W
3. A sediment laden water is to be treated in a sedimentation tank with Type I settling characteristics. The tank is 35 m. long and 20 m. wide with a depth of 5 m. A controlled constant flow rate of 3.5 m³/s passes through the tank. A particle size analysis has been made and the results are listed in the table below: Dp (m) 0.00005 0.00007 0.00009 0.0001 0.0002 Mass Concentration (mg/L) 100 200 300 200 100 Assume that the particle densities are all 2,000 kg/m³ and the dynamic viscosity of water is 0.001 Ns/m². (a) Determine the effluent particle size distribution and the effluent sediment concentration by using a spreadsheet or writing a QuickBASIC program. (b) Determine the particle removal efficiency (%) of the tank.
(ii) Consider a primary sedimentation tank (PST) in a water treatment plant with surface overflow rate of 4000 litres/hr/m². What percentage of particles of diameter: (a) 0.05 mm (b) 0.02 mm will be removed in this tank at 20°C? [Assume Stoke's law is valid] Assume at 20°C: Density of water 1000 kg/m³. Density of particle = 2650 kg/m³. g = 9.81 m/s². kinematic viscosity of water (v) = 1.10 × 10-6 m²/s.
two sedimentation tanks operate in parallel. The combined flow to the two tanks is .1 m^3/s. the depth of each tank is 2 m and each has a detention time of 4 h. what is the surface area of each tank and what is the overflow rate of each tank in m^3/d*m^2? Please don't provide handwritten solution
A falling head permeability test was run on a soil sample 11.9cm in diameter and 11.3cm long. The head at the start of the test was 95cm and falss to 77cm after 36.5mins. The diameter of the standpipe was 1.44cm. Determine the flow rate. (cm^3/min) through the soil. Use head loss method. Use stored value. Answer in 5 decimal places.
A sedimentation basin in a water treatment plant has a length = 50 m, width = 10 m, and depth = 4 m. Particle density = 1.1x10 kg/m'; water density = 10' kg/m2; and dynamic viscosity = 1.307x10-3 N.sec/m2. What is the flow rate, Q, that would remove 70% of particles with a diameter of 0.4 mm?
For the rectangular horizontal-flow sedimentation basin and influent particle- settling characteristics given, calculate the particle removal efficiency. Parameter Flow rate, m3/day 7,570 Length, m 30 Width, m 5 Settling Velocity, m/h Number of Particles, #/mL 0.2 560 0.6 720 1.0 880 1.4 1110 1.81320 3 2.2 1110 2.6 620 3.0 440 3.4 320 3.8 160
For the rectangular horizontal-flow sedimentation basin and influent particle-settling characteristics given, calculate the particle removal efficiency. Parameter Flow rate, m3/day 7,570 Length, m 30 Width, m 5 Settling Velocity, m/h Number of Particles, #/mL 0.2 560 0.6 720 1.0 880 1.4 1110 1.81320 32.2 1110 2.6 620 3.0 440 3.4 320 3.8 160
A batch test on the sedimentation of slurry containing 200kg/m (C.) is carried out experimentally where the initial height of sediment zone is 900mm (h,). The following data are assumed as follows: Underflow concentration= 1200kg/m³ Feed flow rate=3m3/min The relation between setting velocity (u) and height of sediment zone (h:) can be represented by the following equation: u(mm/min)=0.0178*h; - 3.22 Where the h have taken the values: 700,300,260,200 and 180 mm. Graphically, find the critical rate of sedimentation then the cross section area of tank.