Case 5: Oxygen depletion in deep water (hypolimnion)

Danger:

Anaerobe conditions in the lake:

Ammonia (NH4)
Sulfide (H2S)
Re-dissolving of iron, manganese, phosphorus
“Water crash” - increasing mortality of fish

Trouble in drinking water treatment plant:
Ammonia, sulfide, DOC, iron, manganese

-    Monitoring

-    Management

-    Alarm Action