Fouling Prevention - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

7.5.1.5 Fouling Prevention

Control of fouling and clogging in practice is generally limited to six main strategies:
1. Applying appropriate pretreatment to the feed water. Fine screen helps to eliminate the
build-up of trash, hair, lint and other fibrous materials, and decrease the risk of solids
accumulation.
2. Maintaining operation within the design conditions, such as HRT, SRT, MLSS, temp,
BOD/COD loading, pH, DO, F/ M ratio. Sludge wasting is a key in controlling the target
operating SRT (typically ≥ 15 day) in the system. Table F.1 shows some examples.
Relationship between various operating parameters and their effect
Parameter
MLSS concentration ↑ or ↓
SRT ↑ or ↓
HRT ↓
Temperature ↓
Filamentous bacteria ↑
Air scour intensity ↑
EPS ↑
SMP ↑
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on membrane fouling
Effect on membrane fouling
Fouling potential ↑
Fouling potential ↑
Fouling potential ↑
Viscosity ↑ => membrane permeability ↓
Viscosity ↑ => membrane permeability ↓
membrane permeability ↑
Fouling rate ↑
Fouling potential ↑
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