Water Treatment Operator Certification Study Guide (AWWA) Essay Example
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question
A continuously flowing watercourse
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Perennial Stream
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Algae causes PH to ....... at night
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Decrease
...
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What contributes to creation of algae blooms
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Increased nutrients
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Iron is found mostly in what sources of water
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Groundwater
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Also calle
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the rule of reasonable sharing
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Riparian Doctrine
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Water high in salinity and warm is
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Low in dissolved oxygen
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Reservoir turnover
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Denser water at surface sinking toward the bottom
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Water that flows into rivers after rainfall
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Surface runoff
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Recreation can ....... of land adjacent to a reservoir
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increase the threat of erosion
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Water bearing geological zone composed of material deposited by flowing rivers
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Alluvial aquifer
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What effect will algae have on dissolved oxygen
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Increase DO during the day and lower DO during the night
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How does alkalinity effect the use of copper sulfate
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Copper sulfate is more effective as alkalinity decreases
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The amount of water in a formation depends on.....
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The porosity of the water-bearing formation
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What enables blue green algae to grow
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Nutrients
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Recommended loading rate of copper sulfate for algae control
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5.4 lbs per acre of surface area
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Primary origin of coliform bacteria
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Animal or human feces
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Amount of water a well produces for each foot of drawdown
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Specific capacity
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Most common well used in public water supply
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Drilled well
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What is disinfection
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inactivation or killing of pathogenic organisms
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free chlorine residual valus are based on a contact time of....
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10 minutes
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Strength of Calcium Hypochlorite
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65-70%
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What chemicals raise PH in water
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Soda Ash, Caustic Soda,
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As water temp increases, disinfection action.......
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Increases
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Maximum chlorine usage per day from a 150lb cylinder
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42 lbs
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What chemical is used to soften water through chemical precipitation
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Calcium hydroxide (lime)
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Mudballs are
clumps of........
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Filter media and other material
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Coagulation occurs during the first .....
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1 to 5 seconds
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When should a filter be backwashed
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High head, turbidity breakthrough, or designated hours
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What does CaCO3 (Calcium Carbonate) do?
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Decreases corrosion
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Most important test to indicate proper sedimentation
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turbidity
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What is considered and excellent zeta potential
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-1 to -4
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What is used to test for residual chlorine
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DPD
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What is a major part of a turbidimeter
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Light source
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What parameter is used o indicate clarity of water
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turbidity
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PH is the measure of.........
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hydrogen ion concentration
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Free chlorine residual includes
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OCI- and HOCI
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How many log removal for viruses
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4 log 99.99%
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Highest concentration of hypochlorous acidoccurs at what PH?
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5
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What flask is most accurate
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volumetric flask
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What flouride comes in solution form
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flourosilicic acid
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Chemical formula for bicarbonate
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HCO-3
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Capability of water to resist change in PH is called
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Buffering capacity
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In a coliform presence-absence test a sample should be
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incubated for 24 and 48 hours at 35*
C
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Optimal flouride concentration in drinking water is set in relation to the........
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Annual average maximum daily air temp
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What test is used to determine optimal coagulant dosage
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Jar Test
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Sequence of growth in a multiple-tube fermentation method
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LTB, BGB, and EMB. Lauryl Tryptose Broth, Eosin Methylene Blue, Brilliant Green lactose Bile Broth
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Giardia cysts range in size from
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class="flashcard__a_text">8 to 20 microns
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Quantity of oxygen that can be dissolved in water is directly related to........
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Temperature
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What is apparent color
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color in sample before it is filtered
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Grease lubricated bearings should be regreased at what frequency?
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3 - 6 Months
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Check valves prevent ...........
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Water from flowing in two directions
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Packing joints should be.......
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Staggered
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Primary function of couplings
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Compensate for alignment changes
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How do you determine watts
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(amps)x(volts)
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What are the different types of pumps
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Centrifugal, positive displacement, and turbine
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What does a hypochlorinator do?
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Feed a liquid chlorine solution into a water supply
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What causes water hammer
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opening or closing a valve too fast
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When should a positive displacement pump be operated?
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When suction and discharge valves are open
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How much does a 1-ton cylinder weigh?
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3,700 lbs
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Pumps seals are classified how?
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Packing ring or mechanical
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What causes pumps to make a pinging sound
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cavitation
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What is the main purpose of priming
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Replace air with water inside the pump
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What is the purpose of a vacuum regulator
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Stop flow of chlorine gas if a leak develops
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Mechanical seals are appropriate for pumps operating under.......
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High suction head
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What valve is most suitable for a throttling application
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Pressure reducing valve
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Valve installed at the end of the suction pipe on a centrifugal pump is called......
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a foot valve
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(Pump efficiency) x (Motor efficiency)
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Wire to water efficiency
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Opening the discharge valve one full turn on a chlorine cylinder will........
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Permit maximum discharge
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What is the "C Value"
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Number that describes smoothness of the interior of a pipe
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Tubercles form on what kind of pipe
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Ductile iron
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What indicates bearing failure
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noise from pump
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