Water Treatment Upset
Your shift briefing
Heavy rain has pushed raw water turbidity from 3 NTU to 15 NTU, and you are the operator on duty. Your plant must keep treated water inside the permit limits all shift: turbidity below 0.3 NTU at the outlet and a chlorine residual between 0.2 and 2.0 mg/L. Dosing, filters and pumps are all yours - public health is the constraint.
Initial conditions
Outlet turbidity limit
< 0.3 NTU
Chlorine residual band
0.2 - 2.0 mg/L
Raw water turbidity
15 NTU (spiked)
Plant
Coagulation / filtration / disinfection
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Run the shift
Decision 1/5Production +0Cost +$0Risk 0Safety 0
Raw water turbidity has jumped from 3 to 15 NTU. The coagulant dose was set for the old conditions.