IN Water/WW Operator case studies
IN Water/WW Operator · Put your knowledge to work in context.
Indiana water and wastewater operator certification is the state credential that allows an individual to serve as the responsible operator of a public drinking water system or a wastewater treatment/collection facility in Indiana. The program is administered by the Indiana Department of Environmental Management (IDEM), the state agency whose website hosts the relevant applications, renewal services, and program pages. The IN Water/WW Operator case studies are 5 cases and about 4,293 words.
1Four Filters and a Peak-Day Demand
A 12-MGD conventional surface water plant has six rapid-sand filters, each with 400 ft² of surface area, designed for 4 gpm/ft². A storm pushes raw turbidity from 6 to 40 NTU; filter runs fall from 60 hours to 22 hours and finished water sits at 0.14 NTU.
832 words, about 4 min2New Main, Chlorine Drum, and a Creek
A crew has just laid 3,000 ft of new 12-inch ductile iron main. The utility's written standard is the continuous-feed method: dose to at least 25 mg/L free chlorine, hold 24 hours, verify residual, flush, then collect two consecutive sets of satisfactory bacteriological samples at least 24 hours apart before the main goes into service.
781 words, about 4 min3Septage, Rising Blanket, and a Wasting Rate Nobody Wants to Change
A 2.5-MGD extended-aeration plant has a 1.0-MG aeration basin and one 60-ft-diameter clarifier. Three weeks ago a septage hauler began dumping about 8,000 gallons per day at the headworks.
891 words, about 4 min4Both Pumps Running and the Level Still Climbing
A duplex lift station with two 500-gpm pumps serves about 1,200 homes. On a dry Friday afternoon SCADA shows both pumps running continuously and the wet well - 10 ft inside diameter, 12 ft deep, high-level alarm at 9 ft - rising 0.8 ft in 10 minutes.
903 words, about 5 min5Four Gas Readings and a Quitting-Time Deadline
A crew must replace a 6-inch gate valve on a force main inside a 10-ft-deep concrete valve vault, 8 ft by 8 ft in plan, with a floor sump holding debris and standing liquid. the top hatch is open and readings taken at the hatch are O2 20.4%, LEL 8%, H2S 14 ppm, CO 5 ppm.
886 words, about 4 min