Water Treatment Operator Class IV case studies
Water Treatment Operator Class IV · Put your knowledge to work in context.
The Water Treatment Operator Class IV credential is the senior-level drinking water operator certificate in Ontario's certification framework, administered through the Ontario Water Wastewater Certification Office (OWWCO) under Ontario Regulations 128/04, 129/04, and 170/03. It is intended for experienced drinking water treatment operators who already hold lower-class certification and are preparing to take responsibility for larger, more complex treatment facilities and for the oversight of other operators. The Water Treatment Operator Class IV case studies are 5 cases and about 3,294 words.
1Filter Run Collapse After Coagulant Feed Change
A 12 MGD conventional plant with four dual-media filters has run 30-day filter runs for months. On Monday the coagulant is switched from liquid alum to a blended polyaluminum chloride product at the same 18 mg/L dose.
714 words, about 4 min2Low Chlorine Residual in a Dead-End Zone
A distribution system fed by a 6 MGD plant has a dead-end residential zone about 4.5 miles from the clearwell. Chlorine residual at the plant is 1.9 mg/L free.
683 words, about 3 min3Turbidimeter Reading Drift and Calibration Dispute
A plant uses online turbidimeters on each filter effluent and a bench turbidimeter for grab samples. The state requires continuous turbidity monitoring with 0.1 NTU resolution and a 0.3 NTU maximum.
698 words, about 3 min4High-Service Pump Vibration After Bearing Replacement
A high-service pump rated 4,000 gpm at 180 ft head was pulled for a bearing replacement after vibration trended up over three months. The maintenance crew replaced the outboard bearing, aligned the coupling with a dial indicator, and returned the pump to service.
574 words, about 3 min5Backwash Recycle and Discharge Permit Limit
A 10 MGD plant backwashes filters with finished water and sends backwash wastewater to a recycle basin that is decanted back to the head of the plant. During a wet spring, the plant runs at 9.5 MGD and backwashes six filters per day.
625 words, about 3 min