ID Water/WW Operator case studies
ID Water/WW Operator · Put your knowledge to work in context.
The Idaho Water and Wastewater Operator certification is administered within the Idaho Department of Environmental Quality's water program, which the department's own site navigation splits into a Drinking Water section and a Wastewater section. Candidates typically pursue the credential to demonstrate competence operating public drinking water treatment and distribution systems or wastewater treatment and collection systems in Idaho. The ID Water/WW Operator case studies are 5 cases and about 2,551 words.
1Chloramine Residual Loss in a Dead-End Distribution Zone
A town of 18,000 switched from free chlorine to chloramines six weeks ago to lower TTHM. One pressure zone is fed by a 12-inch main and ends in 2,400 ft of 8-inch PVC dead-end serving two hydrants and a 300,000-gal elevated tank.
580 words, about 3 min2Anthracite Loss and Turbidity Spike After Cold-Water Backwash
A 6-MGD conventional surface-water plant has six dual-media filters, each with 18 in of anthracite over 12 in of sand. Backwash is water-only at 18 gpm/sf for 10 minutes, followed by a 5-minute filter-to-waste.
495 words, about 2 min3Filamentous Bulking at a Low-F/M Activated Sludge Plant
A 2.0-MGD extended-aeration activated-sludge plant receives 1.8 MGD of municipal wastewater with influent BOD5 210 mg/L and TSS 220 mg/L. The aeration basin volume is 1.4 MG, MLSS is 4,500 mg/L, and dissolved oxygen in the aeration basin is 1.2 mg/L.
465 words, about 2 min4Wet-Weather Lift Station Failure and Imminent SSO
A wastewater collections crew responds to a lift station during a 2-inch rainstorm. The station has three 350-gpm pumps: two duty and one standby, with a wet well 10 ft in diameter and a high-level alarm at 9 ft.
518 words, about 3 min5Pressure Loss, Failed Backflow Assembly, and Positive Coliform Sample
A 6-inch cast-iron water main breaks at 10 a.m. in a commercial district.
493 words, about 2 min