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Water Treatment Final Exam | With complete solution | Latest 2024/25
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Water Treatment Final Exam | With complete solution | Latest 2024/25
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Water Treatment Final Exam | With complete solution | Latest 2024/25 Whats a rapid method of estimating total dissolved content of a water supply? Specific conductance Waterfall aeration devices may cause what type of problems? Encourage biological growth If a person is poisoned by inhaling fluoride what is the first symptom? Sharp biting pain to the nose followed by a runny nose or a nose bleed Drinking water waste is considered what type of waste? Industrial pH kept at ____ will precipitate calcium carbonate? 10 Excess pink water can be caused by what? Potassium permanganate overdose Pressure in a distribution system should not fall below what level? 20psi What is the MCL for Trihalomethanes 0.08 milligrams per liter Shortened filter runs can occur because of a ir bound filters, why is this? Caused by the release of dissolved air in saturated cold water due to a decrease in pressure What is the most expensive aeration device? Mechanical In the Ion exchange process, calcium(Ca) and magnesium(Mg) Ions are exchang ed for what? Na- Ions What are the four stages of the operation of an ion exchange softener? Service, Brine, Backwash, Rinse What is the chief cause of accidents? Carelessness/ negligence Drinking water should be free of what 2 things? Bacteria and toxins Ton tanks have how many fusible metal safety plugs on each ends? 3 to 4 - each side If you have positive sample for total coliform, do what? Repeat samples are required (3) tap upstream and downstream Filters are clogged by what, that can cause head loss? Algae/ aquatic micro organisms What is the meaning of eutrophic High nutrient content What is a bubbler tube used for? Measuring the depths of a well What is the primary advantage of vacuum system chlorination? Safety When chlorin e and ammonia are added to water what is formed? Chloramines What is tapered energy mixing? Reduction of speed or surface area of the paddle or basin What is the best appearance of a floc particle? Discrete (separate) fairly dense What is a cross connec tion? Connection between a drinking water supply and a unapproved water supply What is the meaning of MCL? Maximum contaminant level, (largest allowable amount) What is multi media? Sand , anthracite coal, garnet Hydrochloric acid reacts with what to form hydrogen gas? Metal Venturi's propellar meters, etc .... Are used to measure what? Flows Why should lime and alum sludge never be mixed? Could cause an explosion What is the most common problem due to algae? Taste and odors An increase in lime will have effect on pH? Increase pH How do you check for chlorine leaks? Ammonia soaked rags What effect does chlorine gas have on water? Lowers the pH The addition of caustic soda will have what effect on alkalinity? Increase alkalinity What is the common coagulant? Alum What is the most important control in a solid contact unit? Maintaining the sludge blanket What is a reason for using chloramines or chloride dioxide? Very little or no THMs are formed What measuri ng device provide the most convenient and most repeatable chloride residual results? Amperometric titration If excess like does not lower the hardness, what chemical should you add? Sodium carbonate What gives the best disinfection potential? Contact tim eThe benefits of buying summaries with Stuvia:
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