Wastewater Class Exam Study Questions and Answers Graded A 2024

program for writing reports: - word processor mechanical seal advantage: - lasts longer pump is just back from the shop and pulls high amps, what is the likely cause: - packing too tight change in the discharge head of the pump: - increases flow why does an engine driven blower need to be started under no pressure? - may damage fans belt press water is shiny and the sludge sticks: - lower polymer dosage and adjust belt speed what is a Chain of custody? - time of collection until time of disposal why is ozone generated at the plant? - unstable impeller for water with solids: - closed chlorine tank problems, says the vacuum is normal: - tank empty 12.5% black substituted for gas 500lbs/day assume weight the same as water - how many gallons? - 497 hydrogen peroxide: - oxidizes velocity of water increases what has the biggest effect: - pipe friction loss added to COD to prevent chlorine interference: - mercury sulfate sample is heated in acid is called: - digestion fecal temp in a water bath: - 44.5 degree Celsius +/- .02 temperature that doubles biological activity: - 10C effluent turbidity goes up, tss 30+, MCRT = 14.7 days, what do you do: - increase wasting rate calculate MCRT - formula sheet didn't use VSS so don't on test with 2 pumps running at a lift station with 1 discharge ling it should pump ____________________________ or the maximum average - more than pump but twice as much aeration problem - low surface turbulence, blower normal: - leaks in piping 3 BOD required, 5 compromised, submit how many: - 5 when chlorine is added to wastewater what is measured: - total residual chlorine TRC operator operates an ammonia stripper, must do what to the water: - raise pH pounds of alkalinity to pounds of ammonia: - 7.1 lbs alkalinity to each lb of ammonia meter for measuring sledge: - magnetic meter wasterwater and sludge regulations: - 40 CFR part 136 most significant problem from seasonal sanitary waste: - nutrients, costs, capital costs, etc. pH where hydrogen sulfide is the most corrosive: - less than 5 gas formed when anaerobic digester is started: - hydrogen sulfide, methane, and carbon dioxide phosphorus stripper not working; check for: - nitrates, aluminum hydrogen sulfide stripper adds bleach and sodium hydroxide, what should the pH be? - 6-8