disinfection process is applied. Therefore, chlorination is frequently applied to a
treatment plant effluent just prior to its disposal into a receiving stream. Properly
controlled chlorination of a wastewater plant effluent will effect a 99.5 percent reduction
in total bacterial content.
(7) Disposal. The final effluent from a wastewater treatment plant is
normally discharged into a body of water such as an ocean, lake, or stream. This
discharged effluent must not create a nuisance; it must not exert harmful effects on the
receiving stream or land; and it must meet Federal, state, and local criteria for effluents
(see para 1-8).
a. Primary wastewater treatment includes:
Grinding (includes shredding).
b. Secondary wastewater treatment includes:
Aerobic biochemical processes:
Anaerobic biochemical processes (sludge digestion).
c. Tertiary wastewater treatment may include, but is not limited to, one or more
of the following: