A rectangular settling basin has a depth of 3 m, a length of 40 m and a width of 6 m.The water treated in the basin has a flow rate of 500 L/s and contains 50 mg/L of typea particles, 100 mg/L of type b particles and 180 mg/L of type c particles (particletype letters refer to the particles listed in problem 1). What is the suspended solidsconcentration in the effluent from the settling basin? Determine the overall percentremoval of suspended solids from the water achieved by the settling basin.

To find the suspended solids concentration in the effluent from the settling basin, we need to…

Answered: A rectangular settling basin has a…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Given a settling tank operating at 80% TSS removal efficiency, an inflow of 0.5 m3/s, and an influent concentration of 100 mg/L. Assuming steady state operations, at what flow would operators have to remove sludge in order to achieve a TSS concentration of 1500 mg/L in the sludge? Answer: 0.027 m3/s
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.
To clarify water containing particles with a diameter of 120 m, a settling tank (32 m long, 2.1 m across, and 1.6 m deep) is used. The particle density is 2.5 g/cm3, and the dynamic viscosity of water is 1.3 x 10-2 g/cm.sec. What is the highest flow rate that can be tolerated to ensure that all particles settle in the tank?
Consider the diagram below. Due to infiltration from the storage pond, waterinfiltrates into the subsurface, passes vertically through the upper (unconfined) aquifer,and vertically through the upper confining layer. Due to regional flow, the flux in theupper confined aquifer follows horizontally towards right. Several monitoring wells aredrilled within this system.The rate of infiltration from the pond is 0.2 meters per day. The hydraulic conductivity ofthe upper aquifer is 0.01 cm/sec. The conductivity of the confining layers is 10−5cm/s.The conductivity of the upper confined aquifer is 0.1 cm/s.ASSUME THAT THE WELLS PROVIDE MEASURES OF HYDRAULIC HEADONLY AT THE BASE OF THE WELL.Consider wells A and B. Assume that the base of these wells is separated by 10 meters.a) Which well would have a higher water level?b) What is the difference in water level in these two wells? Provide your answer incentimeters.
A rectangular sedimentation basin with a length twice the width and 3 m deep, receives a flow of 2400 m/day with a normal concentration of suspended solids of 120 mg/l Determine: 1. The surface over flow rate (SOR) when the detention time is 6 hours. 2 The water entering velocity to the basin (cm/min) 3. The efficiency of the basin when the total mass of sludge produced per day is 216 kg.
Calculate in units of hours the hydraulic retention time at peak flow in a settling tank based on the following information The settling tank is rectangular with 5 m depth. The surface loading rate is 20 cubic meters per square meter and per day at dry weather flow (DWF). Peak flow is 2 times the DWF.
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 used
A settling tank (32 m long, 2.1 m across and 1.6 m deep) is used to clarify water containing particles with a diameter of 120 µm. The density of the particles is 2.5 g/cm3 and the dynamic viscosity of water is 1.3 x 10-2 g/cm.sec. What is the maximum flow rate that can be allowed to make sure all the particles settle in the tank?
In order to clarify water containing particles with a diameter of 120 µm, what is used is a settling tank that is 32 m long, 2.1 m wide, and 1.6 m deep? The water's dynamic viscosity is 1.3 x 10-2 g/cm.sec. and the particles' density is 2.5 g/cm3. What is the highest flow rate that can be permitted while still ensuring that all the particles land in the tank?
Choose the typical range of values for the storage coefficient of confined aquifers a) 1-100 b) 0.1-0.3 c) 10 ^ - 12 - 10 ^ - 8 d) 10 ^ - 6 - 10 ^ - 3
Design a primary settling basin (mechanical cleaning) with 2.1 m water depth for a water flow of 34000 m3 /d. Take L:B = 3: 1. Particle settling velocity = 0.0032 m/s. Sludge volume produced in the tank is 50 m3. Find a. Length, breadth and depth of the tank and b. Detention time in hrs.
Question: A rectangular primary sedimentation basin is to be designed for an activated sludge treatment plant serving a municipality. The regulatory agency criteria for primary sedimentation basins used for activated sludge system are as follows: peak overflow rate (S) = 80 m3/d-m2, average overflow rate (S) = 40 m3/d-m2, peak solids loading = 50 kg/d-m2, peak weir loading = 372 m3/m-d. The average flow to the basin is 12 000 m3/d. Calculate the tank surface area in m2. Calculate the peak flow rate in m3/d. Calculate the total suspended solids concentration in the incoming flow to the basin (mg/L) Calculate the total weir length (m)

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