Mitsubishi STERAPORE 5700 Series Instruction Manual page 43

Equipment
Disinfection tank Check chlorinated compound
(if solid chlorinated compound is
used)
NaClO tank State of remaining amount
Dilution water State of water level
tank
Coagulant tank State of remaining amount
Table 6-3 Items Controlled Using Measurement Devices and Responses to be Taken
Object
Trans membrane Initial value -15 kPa or
pressure higher
Membrane scour Calculated at 75 to
aeration amount 150 m
Filtration flow rate Calculated using the set
value
(0.2 to (1.0) m/d)
DO About 1 to 4 mg/L
(Aerobic tank)
MLSS About 5,000 to
15,000 mg/L
ORP About -200 to 0 mV
(Anoxic tank)
*
DO in membrane tanks of separate MBR systems tends to be 4 mg/L or greater, in which case, determine the air
flow rate with a priority on ensuring the air flow rate for membrane cleaning, leaving DO as it stands.
STERAPORE 5700 Series (FF) Instruction Manual
Inspection Item
Control Range
Initial value -15 kPa or lower
75 m
3 2
•h)
/(m 150 m
At or above the set value
At or below the set value
1 mg/L or less
4 mg/L or more
5,000 mg/L or less
15,000 mg/L or more
-200 mV or less
0 mV or greater
Normal State
 Sufficient amount of chlorinated
compound
 At or above the specified volume
 At the specified water level
 At or above the specified volume
 Coagulant consumed as specified
Outside the Controlled Range
3 2
•h) or less
/(m
3 2
•h) or more
/(m
＊
Chapter 6 Operation
Maintenance and
Inspection
Chlorinated compound
replenishment
NaClO replenishment
Inspection of the feedwater line
Coagulant replenishment
Flow adjustment of the coagulant
injection pump
Response
Perform maintenance
cleaning (automatic)
Increase the air flow rate
Decrease the air flow rate
Decrease the filtration
amount
Increase the filtration amount
Increase the air flow rate.
Reduce the MLSS
concentration (within the
control range).
Reduce the air flow rate.
Increase the MLSS
concentration (within the
control range).
Decrease the amount of
sludge extraction.
(Take note of a lack of a DO
due to an increase in MLSS
concentration.)
Increase the amount of
sludge extraction.
(Take note of an increase in
DO due to a decrease in
MLSS concentration.)
(To prevent putrefaction)
Increase DO, decrease the
MLSS concentration, and
increase circulation ratio in
the aerobic tank.
Decrease DO, increase the
MLSS concentration, and
decrease circulation ratio in
the aerobic tank.
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