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A chlorine dose of 5 ppm or mg/L is equivalent to adding 5 lbs. of chlorine per million pounds wastewater flow
The main function of a secondary digester in normal operation is to allow liquids and solids to separate
BOD removal efficiency in a well-operating primary clarifier is generally in the range of 25-40%
The M in the F to M ratio refers to the pounds of mixed liquor suspended solids under aeration in an activated sludge aeration tank
A barminutor may be set to start automatically based on a loss of head pressure through this device
The terms "high rate" and "low rate" refer to the rate at which gas is produced in an anaerobic digester
A grit chamber with a flow velocity of 0.2 ft/sec may allow a significant quantities of volatile material to setle out
Secondary wastewater treatment processes generally involve the aerobic decomposition of organic matter
Preliminary wastewater treatment is used to protect pumping equipment and to facilitate subsequent treatment processes
Solids in a wastewater effluent may undergo aerobic decomposition in the receiving water if dissolved oxygen is available.
Pre-aeration of raw wastewater may result in better removal efficiencies in the primary clarifier
Pre- chlorination of raw wastewater requires that a chlorine residual of at least 0.5mg/L be attained in order to assure odor control
The only function of flights in a rectangular sedimentation tank is to push the settled sludge toward the sludge hopper
Percent efficiency of solids or BOD removal is calculated using the following formula:
IN-OUT / IN X 100
Velocity is an important consideration in the operation of a collection system or a grit chamber
When computing anaerobic digester organic loading one must take into account the loss of solids in the digester supernatant
Extended aeration activated sludge plants are designed to have aeration tanks that can hold approximately one day's flow
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