Practice Test Geeks(WTO) Water Treatment Operator Certification Practice Test
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Source Water Characteristics Flashcards

7 cards from real WTO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Source Water Characteristics flashcards as text

  1. What term describes the phenomenon where warm and cold water layers fail to mix in a lake or reservoir?

    Answer: Thermal stratification

    Thermal stratification occurs when temperature-driven density differences prevent mixing between the warm epilimnion and cold hypolimnion layers.

  2. Which characteristic of source water most directly affects the required coagulant dose in a conventional treatment plant?

    Answer: Turbidity and NOM concentration

    Turbidity (suspended particles) and natural organic matter (NOM) are the primary factors that determine how much coagulant is needed to form settleable floc.

  3. A source water with very low alkalinity (less than 30 mg/L as CaCO3) presents what challenge during coagulation?

    Answer: Insufficient buffering to maintain optimal coagulation pH

    Low alkalinity water lacks the buffering capacity needed to maintain the optimal pH range for coagulation, often requiring alkali addition.

  4. What does the term 'specific conductance' measure in source water?

    Answer: The ability of water to conduct electrical current, indicating dissolved ion content

    Specific conductance measures the capacity of water to conduct electricity, which correlates directly with the total concentration of dissolved ions.

  5. Which naturally occurring compound in source water is most commonly responsible for a rotten egg odor?

    Answer: Hydrogen sulfide

    Hydrogen sulfide gas, produced by sulfate-reducing bacteria in anaerobic conditions, is responsible for the characteristic rotten egg odor in some source waters.

  6. What is the primary significance of measuring a source water's 'true color' versus 'apparent color'?

    Answer: True color is measured after filtering to remove turbidity interference, reflecting only dissolved organics

    True color is measured after removing suspended particles by filtration, isolating the color contribution from dissolved substances like humic and fulvic acids.

  7. A lake experiencing eutrophication will typically show which source water quality trend?

    Answer: Increasing algae growth, decreasing dissolved oxygen, and rising nutrient levels

    Eutrophication involves excessive nutrient enrichment leading to algal overgrowth, which consumes oxygen during decomposition and degrades overall water quality.