Water Treatment Final Exam 2022(100% Verified) 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 1 / 2
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 Filters are clogged by what, that can cause head loss? Correct answer- Algae/ aquatic micro organisms What is the meaning of eutrophic Correct answer- High nutrient content What is a bubbler tube used for? Correct answer- Measuring the depths of a well What is the primary advantage of vacuum system chlorination? Correct answer- Safety When chlorine and ammonia are added to water what is formed? Correct answer- Chloramines What is tapered energy mixing? Correct answer- Reduction of speed or surface area of the paddle or basin What is the best appearance of a floc particle? Correct answer- Discrete (separate) fairly dense What is a cross connection? Correct answer- Connection between a drinking water supply and a unapproved water supply What is the meaning of MCL? Correct answer- Maximum contaminant level, (largest allowable amount) What is multi media? Correct answer- Sand , anthracite coal, garnet Hydrochloric acid reacts with what to form hydrogen gas? Correct answer- Metal Venturi's propellar meters, etc .... Are used to measure what? Correct answer- Flows Why should lime and alum sludge never be mixed? Correct answer- Could cause an explosion What is the most common problem due to algae? Correct answer- Taste and odors An increase in lime will have effect on pH? Correct answer- Increase pH How do you check for chlorine leaks? Correct answer- Ammonia soaked rags What effect does chlorine gas have on water? Correct answer- Lowers the pH
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