Mitsubishi STERAPORE 5700 Series Instruction Manual page 42

6-2-2 Operation Management Procedures
This section describes example management procedures for the septic tank of MBR systems using
recycled nitrification processing.
Inspection items and maintenance work are as indicated in Table 6-2. Important inspection items are
screenings, DO, flux, trans membrane pressure, and the state of aeration. Maintenance inspection of
these items to prevent problems leads to a reduction in running costs. Although inspection frequency
differs according to the treatment facility, perform inspections at least once a week and store the
inspection records in a safe place.
Items managed using measurement devices are shown in Table 6-3. Manage DO preferentially. For
MLSS management, adjust the amount of sludge extraction in view of the next inspection.
Inspection items in Table 6-2 and Table 6-3 (p.43) are illustrated in Figure 6-2.
Equipment
Coarse screen State of screening processing
State of clogging
Grit chamber State of grit chamber deposits
Fine screen State of screening processing
State of clogging
Flow equalization Operating state of the raw water
tank pump
Water level trend
State of mixing/swirl flow
State of sludge and scum
generation
Extra fine screen Operating state
(noise, vibration, appearance‥ )
State of screening processing
State of clogging
Anoxic tank Mixing state
State of bubble and scum
generation
ORP measurement
Aerobic tank Aeration state
(membrane
module) Aeration amount
State of bubble and scum
generation
Permeate pump and the
circulation pump
Operating state of each
measurement device
Check sludge concentration
Water level state
Check trans membrane pressure
Check membrane filtered water
Check DO
STERAPORE 5700 Series (FF) Instruction Manual
Table 6-2 Example of Inspection Items and Maintenance to Perform
Inspection Item Normal State
 Small amount of screenings
deposits
 No clogging
 Small amount of grit
 Small amount of screenings
deposits
 No clogging
 Design flow rate is achieved
 Weekly or monthly change is small
 Smooth swirl and mixing with no
unpleasant odor
 Small amount of sludge and scum
generation
 Smooth operation without abnormal
noise or vibration
 Small amount of screenings
deposits
 No clogging
 Smooth mixing
 Small amount of bubbles and scum
 Within the proper range
 Smooth and even swirl
 Proper flow rate
 Small amount of bubble and scum
 Normal flow rate and operating
cycle
 Proper measurement values
obtained and the preset values
maintained
 Within the specified range
 Water level maintained meets the
specified value
 No drastic changes and at or below
the specified value
 Transparent with no suspended
solids
 Within the proper range
Chapter 6 Operation
Maintenance and
Inspection
Cleaning and screenings
removal
Cleaning and grit removal
Cleaning and screenings
removal
Pump inspection
Water level gauge inspection
Mixer inspection
Cleaning sludge and scum
removal
Immediate repair and
replacement in response to
maloperation due to failure
Cleaning, screenings and
substance removal
Mixer inspection
Cleaning and scum removal
MLSS adjustment
Blower and diffuser parts
inspection
Flow rate adjustment
Cleaning and scum removal
Flow rate adjustment
Pump inspection
Inspection and calibration of
measurement devices
Sludge extraction and
adjustment of extraction amount
Water gauge level inspection
Membrane cleaning
Inspection of membrane and
pipes
Air flow rate adjustment
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