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- a) An activated sludge plant with recycle is evaluating its secondary clarification system. Settling column tests are conducted and analyzed for settling velocities at different initial solids concentrations. The data are provided below. The plant flow rate is 10,000 m3/d, with a recirculation ratio of 0.5. The MLSS in the reactor is 4000 mg/L. The desired underflow concentration is 17,000 mg/L. Solids concentration mg/L Settling velocity m/h 1500 6.5 3000 5.1 4500 4 6000 2.95 7500 2 9000 1.4 12,000 0.5 15,000 0.27 17,000 0.2 b) Design secondary clarifiers for the activated sludge plant of problem a), with a recycle ratio of 0.6. Calculate the required surface area if two clarifiers are used. Also calculate underflow rate, underflow velocity, and overflow rates. Clearly state your assumptions.Question 8A 200 g/l solution of common salt was discharged into a stream at a constant rate of 25l/s. The background concentration of the salt in the stream water was found to be 10 ppm. At a downstream section where the solution was believed to have been completely mixed, the salt concentration was found to reach an equilibrium value of 45 ppm. Estimate the discharge in the stream.for the following conditions, determine the groundwater infiltration. new two lane highway, lane width 12ft; shoulder width 10ft; length of crack 20ft; rate of infiltration 0.5ft^3/day/ft^2; spacing of crack 25ft kp=15*10^-5 ft/day
- The bed thickness of a speed sand filter is 1.3 m. A sand with a specific diameter of 0.8 mm and a specific gravity of 2600 kg / m3 will be used as filter material. The shape factor of the sand is 0.9 and the porosity of the clean bed is 0.45. The water layer thickness on the bed is 1.1 m. Average filtration speed is 130 m / day and maximum filtration speed is 180 m / day. The maximum flow rate is 24087 m3 / day and the kinematic viscosity of water is 1.01x10-6 m2 / sec. The maximum head loss in the filter is required to be 1.9 m and negative pressure is not allowed. a) Find the initial head loss of the filter bed. b) Find the required number of filters and the area of each filter in case 3 filters are in reserve. c) Calculate how many meters depth the pollution penetrates at the end of filtration.A one cell rapid sand filter tank has a loading rate 9.0 m/h, surface dimensions of 15*6 m. The sand and gravel depths are 70 cm and 60 cm respectively. The height of wash trough is 50 cm and the height of water above surface of sand is 2.0 m. Note that Shape factor of sand is 0.80 and stratified bed porosity is 0.50. a) What flow rate (m³/sec) does the filter handle during production? b) What is the total height of filter basin (m)? c) Calculate the head loss if the value of this term [2 (Co fid)] equal to 105700. d) In your opinion this filter tank specified the Saudi specifications?A single media filter has a 720mm deep bed of sand (diameter = 5 x 10^-4 m, shape factor = 0.8). The porosity of the system is 0.40. The filtration rate is 1.2 (L/s)m^2. The water viscosity is 1.14 x 10^-6 m^2/s. A. What is the Reynold’s number of the filter B. What is the friction factor for the filter? C. What is the total clean head loss across the filter in m?
- A filter contains 0.55mm sand that has a density of 2650 kg/m3. Calculate the effective size of 1550 kg)m3 anthracite that would be matched to this sand.Problem 5: Design a aerated grit chamber for a wastewater treatment plant where the incoming average flow rate is 0.8m3/s. Assume • a peak factor of 2.5. • Detention time = 225 sec • Width to Depth ratio = 1.5:1 • Width = 3 m • Aeration requirement is 0.3 m3/min/m • Sludge generation 40L/103 m3A) In an ideal rectangular horizontal sedimentation tank, a group of flocs/particles with settling velocity equal to overflow rate can be 100% removed. True or False B) The performance of sedimentation tank doesn't have significant impacts on the length of duration for filtration in the filters following the sedimentation tank. True or False
- An activated sludge plant with recycle is evaluating its secondary clarification system. Settling column tests are conducted and analyzed for settling velocities at different initial solids concentrations. The data are provided below. The plant flow rate is 10,000 m3/d, with a recirculation ratio of 0.5. The MLSS in the reactor is 4000 mg/L. The desired underflow concentration is 17,000 mg/L. Solids concentration mg/L Settling velocity m/h 1500 6.5 3000 5.1 4500 4 6000 2.95 7500 2 9000 1.4 12,000 0.5 15,000 0.27 17,000 0.2 a. Calculate the required surface area if one clarifier is used. b. Calculate underflow rate, underflow velocity, and overflow rate for single clarifier design. Clearly state your assumptions. c. Calculate the required surface area if two clarifiers are usedA water sample was incubated at 20 °C for 3 days and its BOD3 concentration was found to be 150 mg/L. Given k20°c = 0.20/day (base e) and temperature coefficient for the rate constant is equal to 1.05. (a) BODultimate of this water sample=..............….mg/L (b) The BODs of this sample at 20 °C (in mg/L) =...……...... (c) kıs°c (in day-¹) mg/L.............. (d) The BODs of this sample at 15 °C (in mg/L) =...............Hemant Kohli please answer: Two identically sized primary settling tanks receive water for Type-1 settling (discrete particles in dilute suspension) under laminar flow conditions. The surface overflow rate (SOR) maintained in the two tanks are 30 m3/m2.d and 15 m3/m2.d. The lowest diameters of the particles, which shall be settled out completely under SORs of 30 m3/m2.d are designated as d30 and d15 respectively. The ratio d30/d15 is: