7.)Which of the following statements is true?A.) The critical design parameter for a settling tank or clarifier is the water overflowrate because it decides the extent of particle removalB.) The critical design parameter for a settling tank or clarifier is the water overflowrate because it corresponds to the settling velocity of the smallest particlesC.) The critical design parameter for a settling tank or clarifier is the water overflowbecause particles with a settling velocity less than the overflow rate will not beremovedD.) Both A and C

The design parameters of setting tank includes loading rate of solids, overflow rate, side water…

Answered: Which of the following statements is…

Engineering

Civil Engineering

Which of the following statements is true?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Seepage

Section: Chapter Questions

Problem 7.1P

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• Q-3. Settling characteristics of a conceritrated suspension C = 3000 mg/t were deterrmined in a laboratory study. The suspension was settled in a colurmn 100-centimeters high, aind thé height of the interface h, was recorded with tirme Time, minutes 100 79 60 10 15 38 20 25 23 15 30 12 35 40 50 7.5 Calculate the area required to achieve clarification and to yield a thickeried sludge concentration of 25,000 mg/f- for an inıfluent flow rate of 5 mgd.
Consider particles in suspension and their settling behaviour at different concentrations select the correct statement(s). Type 1 settling is called discrete settling. Your option is Correct B Terminal velocity in suspension is achieved when drag force is balanced by gravity force. Your answer is IN-CORRECT Correct Option 24 In Type 1 settling, for Ree(100, 300) Cp = +0.34 (Re = Reynold's number) Re VRe D In Type 2 settling, the velocity of floc does not remain terminal and keeps changing as the size of the floc changes. Your option is Correct
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Enter T next to the following true statements and F next to the false statements. Settling of suspended solids in secondary clarifiers is typical of Type II sedimentation. Thickening prior to digestion is common in many wastewater treatment plants because it reduces the size needed for the digester. Based on a temperature of 30°C, a design mean cell residenee time of about 20 days would be reasonable for a completely-mixed anaerobic digester without recycle. A volatile suspended solid is defined as an organic solid that can be oxidized to CO2 (g) at 250°C. The theoretical yield coefficient can be estimated from the observed yield coefficient if the specific growth rate constant is known. Air flotation would likely be more efficient for thickening waste activated sludge than primary sludge, while the opposite would be true for gravity thickening. The net mass of cells produced in the activated sludge process equals the total cell mass synthesized minus the cell mass wasted as waste…
1. The particle settling velocity in a fluid–particle suspension: (a) increases with increasing ratio of particle diameter to characteristic system dimension; (b) increases with increasing particle concentration; (c) increases with increasing fluid viscosity; (d) none of the above. 2. The terminal velocity of a particle settling in a stagnant fluid: (a) increases with increasing ratio of particle diameter to characteristic system dimension; (b) increases with increasing solids concentration; (c) both (a) and (b); (d) none of the above. Please explain the answer. Thank you.
3. Circular clarifiers are used to remove solid materials from water. They allow continuous treatment of water and can handle fairly large flows. Solids settle to the bottom of the clarifier and are carried away by a small stream of water (the waste stream). Most of the water exits the tank as treated effluent. Assume a clarifier receives a flow of 0.10 m3/s with a solid concentration of 800 mg/L. If the waste stream consists of 3% of the incoming flow and carries 90% of the incoming solids, a) what is the solids concentration in the waste stream, and b) what is the solids concentration in the treated effluent?
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.
There is sedimentation tank that is used to remove suspended solid particles from an incoming wastewater stream. The incoming wastewater has a flowrate of 150 m³/hr and the sedimentation tank has a basin surface area of 15 m2. Assume the operation temperature is 25 C and assume that sedimentation is the only process by which suspended solid particle are removed from the sedimentation tank. a) What is the settling velocity of the suspended solids in this sedimentation tank in the unit of m/s
ASAP
(a) A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m3 /s. The design TDS concentration of the product water is below 400 mg/L. The net pressure is 40 atm. The membrane manufacturer provides that the membrane has a water flux rate coefficient of 2.2 x 10-6 s/m and a solute mass transfer rate of 1.5 x 10-6 m/s. Calculate the membrane area required for the RO system. (B) A water treatment at Nibong Tebal receiving a raw water contains a concentration of 0.5 µg/m3 atrazine from Kerian River. In order to comply with the drinking water quality guideline, the treatment plant should reduce the concentration of Atrazine to 0.1 µg/L. If the dosing of powdered activated carbon have been applied before the coagulation, calculate the minimal dose of PAC in mg/m3 .
In a rapid sand filter, the time for reaching particle break through (T,) is defined as the time elapsed from start of filter run to the time at which the turbidity of the effluent from the filter is greater than 2.5 NTU. The time for reaching terminal head loss (T,) is defined as the time elapsed from the start of the filter run to the time when head loss across the filter is greater than 3 m. The effect of increasing the filter depth (while keeping all other conditions same) on T and T is (A) T increases and T decreases. (B) Both T and T increase. (C) T decreases and T, increases. (D) Both T and T , decrease.
The rate of flow in a settling tank is 0.2 m³/s. The value of G of particles in the water is 2.7 and the kinematic viscosity of water is 1.02x10-2 cm²/s. Calculate the required area of tank for removing particles of size 0.07 mm.