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AIRE-064-1-4
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supply.
c. Check the control devices work well during the clean water operation,
d. Start filtration with clean water. Measure and record the trans-membrane pressure
and water temperature at designed filtration rates (at a normal, maximum and
minimum flow rate). Maintain such records.
e. Stop the filtration and the air supply as soon as the above tests finish.
Don't conduct clean water operation for a long time. Clean water
operation tends to cause membrane clogging.
Keep the membrane wet once it gets wet with clean water
operation. If that membrane get dried up, the permeability may be
decreased seriously.
2. Seeding Sludge Injection
The membrane may get clogged seriously if you filtrate the wastewater without activated
sludge, so don't fail to inject the seeding sludge first before starting filtration.
Please inject the seeding sludge to the membrane submerged tank with the following steps:
(1)
Get the activated sludge used for the treatment of same kind of wastewater. It is
recommended that its MLSS is higher than 20,000 mg/L.
(2)
Remove foreign matters from the sludge with the mesh screen which opening is
5.0 mm or under and inject it to the tank.
(3)
The amount of sludge injected should be adjusted to make MLSS of the
membrane submerged tank higher than 7,000 mg/L. Please start feed the raw
wastewater soon after the sludge injection.
*
Do not use seeding agents.
Remove foreign matters from the seeding sludge with the mesh
screen which opening is 5.0 mm or under before injection.
3. Actual Filtration Operation
Following the seeding sludge injection, please start the air diffusion, the filtration and the raw
wastewater feed. Once the permeate water flow is stabilized, please measure and record the
trans-membrane pressure and the liquid temperature. The details for operation control are
given in the next chapter.
CAUTION
!
CAUTION
!
CAUTION
!