Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Chapter 4, Problem 4.13P
To determine
Grate spacing and horsepower required by the shredder
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1. Find moments of inertia around horizontal and vertical centroid axes for given 6 cross sections.
1)
30cm
5cm
10cm
20cm
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3)
An anchored sheet-pile bulkhead is shown in the figure below. Let L₁ = 2 m. L₂ =6 m. l₁ = 1 m = 17 kN/m². sat -18.86 kN/m², '=32°, and c=27 kN/m². Use the free earth support method.
Anchor
Sand
= 0
Water table
L
Sand
Ysat
c' = 0
Clay
= 0
1. Determine the theoretical depth of embedment, D.
(Enter your answer to three significant figures.)
D=
m
2. Calculate the anchor force per unit length of the sheet-pile wall.
(Enter your answer to three significant figures.)
F=
kN/m
Calculate the dry mass of activated sludge (✗a) produced in wastewater treatment
system where the flow rate is 7,500 m³/day, the BOD concentration in the primary
effluent (i.e., the BOD concentration in the wastewater going to the aeration basin)
is 75 mg/L, the soluble BOD concentration in the liquid effluent of the secondary
clarifier is 10 mg/L, and the system is operating with an SRT of 3 days. Assume true
yield is 0.5 g VSS per g BOD and the decay rate (i.e., bч or kd) is equal to 0.1 days
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nonbiodegradable VSS, and influent inert TSS is negigible. Express your answer in
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