Environmental Engineering Reference
In-Depth Information
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61. Determine the chlorinator setting, in pounds per day, necessary to treat a
flow of 5.5 MGD with a chlorine dose of 2.5 mg/L.
62. To dechlorinate a wastewater, sulfur dioxide is to be applied at a level 4
mg/L more than the chlorine residual. What should be the sulfonator feed
rate, in pounds per day, for a flow of 4.2 MGD with a chlorine residual of
3.1 mg / L?
63. What should be the chlorinator setting, in pounds per day, to treat a flow
of 4.8 MGD if the chlorine demand is 8.8 mg/L and a chlorine residual of
3 mg/L is desired?
64. A total chlorine dosage of 10 mg/L is required to treat the water in a unit
process. If the flow is 1.8 MGD and the hypochlorite has 65% available
chlorine, how many pounds per day of hypochlorite will be required?
65. The chlorine dosage at a plant is 5.2 mg/L. If the flow rate is 6,250,000 gpd,
what is the chlorine feed rate in pounds per day?
66. A storage tank is to be disinfected with 60 mg/L of chlorine. If the tank
holds 86,000 gal, how many pounds of chlorine gas will be needed?
67. To neutralize a sour digester, 1 lb of lime is to be added for every pound of
volatile acids in the digester liquor. If the digester contains 225,000 gal of
sludge with a volatile acid level of 2,220 mg/L, how many pounds of lime
should be added?
68. A flow of 0.83 MGD requires a chlorine dosage of 8 mg/L. If the hypochlo-
rite has 65% available chlorine, how many pounds per day of hypochlorite
will be required?