Environmental Engineering Reference
In-Depth Information
12.65 What is the pond area in acres?
12.66 What is the pond volume in acre-feet?
12.67 What is the influent flow rate in acre-feet per day?
12.68 What is the influent flow rate in acre-inches per day?
12.69 Give three classifications of ponds based on their location in the
treatment system.
12.70 What kind of odors can scrubbers be effectively used for?
12.71 What is the optimum velocity through a bar screen?
12.72 About how much (percentage) of an RBC is submerged?
12.73 At what depth should the sludge blanket be maintained?
12.74 What is disinfection ?
12.75 Describe the processes occurring in a raw sewage stabilization
pond (facultative).
12.76 How do seasonal changes affect the quality of the discharge from
a stabilization pond?
12.77 What are the two most common sources of oxygen for lagoons?
12.78 What is the normal depth range of a facultative pond?
12.79 What is the advantage of using mechanical or diffused aeration
equipment to provide oxygen?
12.80 Describe how the dissolved oxygen level of a pond changes dur-
ing the day.
12.81 What is the purpose of the polishing pond?
Use the following information for Questions 12.82 through 12.86 (in all
cases, assume that the flow is equally split between the two filters):
Plant effluent
Flow = 2.10 MGD
Suspended solids = 2.05 mg/L
BOD 5 = 190 mg/L
Trickling filters
Number = 2
Diameter = 90 ft
Media depth = 8 ft
recirculation ratio = 1.5:1.0
12.82 What is the total flow (in MGD) to each filter?
12.83 What will the total flow to each filter be (in MGD) if the operator
changes the recirculation ratio to 0.70:1.0?
12.84 What is the hydraulic loading (in gpd/ft 2 ) for each filter at a 1.5:1.0
recirculation ratio?
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