OH Water/Wastewater Operator case studies
OH Water/Wastewater Operator · Put your knowledge to work in context.
The Ohio Water/Wastewater Operator certification is administered by the Ohio Environmental Protection Agency (Ohio EPA) through its Division of Drinking and Ground Waters, which lists operator certification among its program areas. The credential is intended for individuals who operate or supervise public drinking water treatment and distribution systems and wastewater treatment and collection systems in Ohio, and who must demonstrate competence to protect public health and the environment. The OH Water/Wastewater Operator case studies are 5 cases and about 3,901 words.
1Storm-Driven Turbidity Spike With Two Filters Down
A 4.0 MGD conventional surface-water plant draws from a river that rose six feet after two days of rain. Raw turbidity climbed from 5-8 NTU to 95-115 NTU; raw pH 7.5, alkalinity 88 mg/L as CaCO3.
784 words, about 4 min2Chloramine Residual Collapse in Summer Dead Ends
A 6.2 MGD community system has used chloramination for three years to control THMs. Free chlorine is applied ahead of a four-hour clearwell and ammonia is dosed as the water leaves the plant, targeting 3.0 mg/L total chlorine and free ammonia below 0.1 mg/L at the plant tap.
722 words, about 4 min3Cold-Weather Nitrification Loss at an Activated Sludge Plant
A 2.6 MGD extended-aeration activated sludge plant has a permitted effluent ammonia limit of 1.5 mg/L monthly average from April through October and 2.5 mg/L November through March. Influent ammonia is 26 mg/L, flow 2.4 MGD, and water temperature has fallen from 18 to 10 degrees C in three weeks.
804 words, about 4 min4Wet-Weather Overflow at a Generator-Dependent Lift Station
A 1.8 MGD residential lift station serves 2,100 homes through 26 miles of 8- to 15-inch vitrified clay and concrete pipe, much of it installed in the 1960s. The station has two 75-hp pumps, a wet well that holds about 20 minutes at average flow, and telemetry that calls the duty operator's phone.
814 words, about 4 min5Main Break at Zero Pressure: Advisory or Not
a 12-inch unlined cast iron main installed in 1952 fails under a residential street and the hole is boiling. The main feeds a 400-connection neighborhood that includes an elementary school with 540 students and a 90-bed nursing home.
777 words, about 4 min