Mechanical Equipment. The following maintenance instructions are
general. Maintain individual pieces of equipment according to the recommendations of
the manufacturer. Operating procedures and ambient conditions, such as dirt and
vibration, may dictate maintenance schedules different from those recommended here.
Aerators. Maintenance frequencies for aeration equipment are
summarized in Table 34.
Rapid-Mix Basins and Equipment. Because rapid-mix devices revolve at
great speed, do not attempt to check the rotation of the mixer paddles during operation,
except by visual observation. When the mixing basin is empty, check the condition of
the paddles, bearings, drive shaft, and motor. Then clean, lubricate, and paint as
necessary. Table 35 presents a summary of maintenance procedures for rapid-mix
Flocculators. Table 35 covers flocculator maintenance.
Sedimentation Basins and Clarifiers. All types of settling basins require
the same basic maintenance (lubrication, cleaning, flushing, and painting). Maintain
basins that incorporate proprietary mechanisms or devices according to the
manufacturer's instructions. Table 35 presents a summary of maintenance procedures
for sedimentation basins.
Non-mechanically Cleaned Sedimentation Basins. Clean these
sedimentation basins at about 3-month intervals, or when development of an odor or
rising floc particles indicates development of septic sludge conditions. Basins with
mechanical equipment for removing settled sludge usually clean themselves
satisfactorily during normal operations. However, it may be necessary at times to drain
them and to clean the tank and mechanism with a high-pressure water hose.