Mbr Wwtp Fouling Control & Troubleshooting Chart; Air Scouring - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

3. Employing appropriate physical or chemical cleaning protocols. For example, sodium
hypochlorite and citric acid solutions are used to remove organic and inorganic foulants
respectively.
4. Chemically or biochemically modifying the mixed liquor, such as addition of coagulants
and powdered activated carbon (mostly in industrial effluent).
5. Reducing the flux. Particulate/colloid fouling is "reversible" in the sense that a reduction of
the forward flux (through lowering of the membrane flux or solids concentration) or an
increase of backwash intensity restores membrane permeability.
6. Ensure sufficient air scouring is being maintained to slough off excessive biofilm layer on
the membrane surface.
7.5.1.5 MBR WWTP Fouling Control & Troubleshooting Chart
Combination of membrane physical cleaning operations as air scouring, backwashing and
relaxation are efficient in membrane fouling control.

7.5.1.5.1 Air Scouring

Aeration generates a shear stress at the membrane surface, which provides a scouring action
and reduces membrane cake fouling.
Membrane air scouring check is essential procedure for newterra MBR WWTP. Air scour has to
be observed for uniformity of bubbling action all across the membrane module/cassette on
regular basis. It is easy to observe through clear window in membrane tank. Operator should
note any unusual patterns of air
damage of air diffusers and if this occurs, empty the tank and fix the diffuser;
air leakages: if this occurs, tighten up the fittings.
If there is insufficient air scouring, localized dewatering (clogging, sludging, caking and
plugging) may occur and as a result, membrane fouling occurs.
Proper air scouring
in membrane tank
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Uneven aeration in
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