Water Treatment Final Exam| 155 questions| with complete solutions

Whats a rapid method of estimating total dissolved content of a water supply? Correct Answer: Specific conductance Waterfall aeration devices may cause what type of problems? Correct Answer: Encourage biological growth If a person is poisoned by inhaling fluoride what is the first symptom? Correct Answer: Sharp biting pain to the nose followed by a runny nose or a nose bleed Drinking water waste is considered what type of waste? Correct Answer: Industrial pH kept at ____ will precipitate calcium carbonate? Correct Answer: 10 Excess pink water can be caused by what? Correct Answer: Potassium permanganate overdose Pressure in a distribution system should not fall below what level? Correct Answer: 20psi What is the MCL for Trihalomethanes Correct Answer: 0.08 milligrams per liter Shortened filter runs can occur because of air bound filters, why is this? Correct Answer: Caused by the release of dissolved air in saturated cold water due to a decrease in pressure What is the most expensive aeration device? Correct Answer: Mechanical In the Ion exchange process, calcium(Ca) and magnesium(Mg) Ions are exchanged for what? Correct Answer: Na- Ions What are the four stages of the operation of an ion exchange softener? Correct Answer: Service, Brine, Backwash, Rinse What is the chief cause of accidents? Correct Answer: Carelessness/ negligence Drinking water should be free of what 2 things? Correct Answer: Bacteria and toxins Ton tanks have how many fusible metal safety plugs on each ends? Correct Answer: 3 to 4- each side If you have positive sample for total coliform, do what? Correct Answer: Repeat samples are required (3) tap upstream and downstream