A primary clarifier is to be designed to treat a municipal wastewater. The influentto the clarifier has a flow rate of 7570 m³/d and a total suspended solids concentration of 320mg/L. A laboratory settling test was performed with the following results:Suspended Solids Concentration (mg/L) at Given DepthsSampling Depth (m)Time (min)0.611.222462.442722431.833.051023026228220157195230253301151602112212304590134163179195604810213115417090295886115141(a) Determine the design overflow rate and detention time assuming 65% of the suspendedsolids are to be removed. Use typical scaling/safety factors as appropriate.(b) Determine the required diameter (to the nearest 0.1 m) and the required depth (to thenearest 0.01 m) for the clarifier.

The given data is: Flow rate=7570 m3/day Total suspended solid concentration=320 mg/l Now as 65% of…

A primary clarifier is to be designed to treat a municipal wastewater. The influen to the clarifier has a flow rate of 7570 m³/d and a total suspended solids concentration of 320 mg/L. A laboratory settling test was performed with the following results: Suspended Solids Concentration (mg/L) at Given Depths Sampling Depth (m) 1.83 262 Time (min) 3.05 282 253 230 0.61 1.22 246 2.44 272 10 230 20 157 195 230 243 30 115 160 211 221 45 90 48 134 163 179 154 195 60 102 131 86 170 90 29 58 115 141 (a) Determine the design overflow rate and detention time assuming 65% of the suspended solids are to be removed. Use typical scaling/safety factors as appropriate. (b) Determine the required diameter (to the nearest 0.1 m) and the required depth (to the nearest 0.01 m) for the clarifier.

A primary clarifier is to be designed to treat a municipal wastewater. The influen to the clarifier has a flow rate of 7570 m³/d and a total suspended solids concentration of 320 mg/L. A laboratory settling test was performed with the following results: Suspended Solids Concentration (mg/L) at Given Depths Sampling Depth (m) 1.83 262 Time (min) 3.05 282 253 230 0.61 1.22 246 2.44 272 10 230 20 157 195 230 243 30 115 160 211 221 45 90 48 134 163 179 154 195 60 102 131 86 170 90 29 58 115 141 (a) Determine the design overflow rate and detention time assuming 65% of the suspended solids are to be removed. Use typical scaling/safety factors as appropriate. (b) Determine the required diameter (to the nearest 0.1 m) and the required depth (to the nearest 0.01 m) for the clarifier.

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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Concept explainers

Laboratory Determination of Hydraulic Conductivity

Hydraulic conductivity is the measure of flowability of water inside the soil in the presence of a hydraulic gradient. The hydraulic gradient is defined as the difference in the water heads in the soil, which induces a water motion. In simple terms, a hydraulic gradient is the presence of a potential that induces a flow of water.

Question

A primary clarifier is to be designed to treat a municipal wastewater. The influent
to the clarifier has a flow rate of 7570 m³/d and a total suspended solids concentration of 320
mg/L. A laboratory settling test was performed with the following results:
Suspended Solids Concentration (mg/L) at Given Depths
Sampling Depth (m)
Time (min)
0.61
1.22
246
2.44
272
243
1.83
3.05
10
230
262
282
20
157
195
230
253
30
115
160
211
221
230
45
90
134
163
179
195
60
48
102
131
154
170
90
29
58
86
115
141
(a) Determine the design overflow rate and detention time assuming 65% of the suspended
solids are to be removed. Use typical scaling/safety factors as appropriate.
(b) Determine the required diameter (to the nearest 0.1 m) and the required depth (to the
nearest 0.01 m) for the clarifier.

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In a constant head permeability test, if the discharge coming out of the sample is 0.35 cm³/s find the coefficient of permeability if the length and area of cross section of the sample is 30 cm and 250 cm² respectively. The head loss per unit length of the sample can be assumed as 0.25.
Darcy concept.
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.
Q. Solve this seepage problem.
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 type a particles, 100 mg/L of type b particles and 180 mg/L of type c particles (particle type letters refer to the particles listed in problem 1). What is the suspended solids concentration in the effluent from the settling basin? Determine the overall percent removal of suspended solids from the water achieved by the settling basin.