PA Water/Wastewater Operator case studies
PA Water/Wastewater Operator · Put your knowledge to work in context.
The Pennsylvania Water/Wastewater Operator Certification Exam is the credentialing pathway for people who operate or supervise drinking water systems and wastewater systems in the Commonwealth. The Pennsylvania Department of Environmental Protection (DEP) is the state agency that houses the water programs behind this credential - the department describes its mission as protecting "Pennsylvania's air, land, and water resources while ensuring the health and safety of all residents and visitors to the commonwealth" - and its Operator Certification program page is the authoritative place to confirm eligibility, application steps, fees, scheduling, and scoring before you register. The PA Water/Wastewater Operator case studies are 5 cases and about 4,236 words.
1Filter Runs Collapse After a Storm
A 2.5 MGD conventional surface water plant draws from a reservoir and runs four dual-media filters with alum coagulation, flocculation, and sedimentation. On Monday the raw water is 4 NTU, 90 mg/L alkalinity as CaCO3, and pH 7.4, and the alum dose is 28 mg/L.
796 words, about 4 min2Chlorine Residual Collapse at a Dead End
A groundwater system delivers 3.2 MGD and leaves the plant at 1.15 mg/L free chlorine. An 8,000-foot, 6-inch unlined cast iron dead-end main serves six homes, a small market, and a K-8 school, roughly 2,000 gallons per day combined.
866 words, about 4 min3Bulking Sludge in an Oxidation Ditch
A 0.35 MGD extended-aeration oxidation ditch has a 0.30 MG aeration basin. MLSS is 4,200 mg/L, SVI is 240 mL/g, and dissolved oxygen sits at 0.7 to 1.0 mg/L even with both blowers running.
744 words, about 4 min4Wet Well Alarm During a Rainstorm
A duplex submersible pump station serves a 400-home subdivision with two 300 gpm pumps on alternating lead. The 10-foot-diameter wet well has a 6-foot operating band; the lag pump starts at 7 feet and the high-level alarm at 8.5 feet.
900 words, about 5 min5Main Break, Precautionary Notice, and Restoring Service
on a Sunday, a 12-inch unlined cast iron main installed in 1952 breaks under a residential street. Normal pressure is 40 psi; pressure in the area falls to about 12 psi before the crew isolates the break.
930 words, about 5 min