Water Treatment Operator Certification Study Guide (AWWA)

Water Treatment Operator Certification Study Guide (AWWA) A continuously flowing watercourse - ✔✔Perennial Stream Algae causes PH to ....... at night - ✔✔Decrease What contributes to creation of algae blooms - ✔✔Incr ...

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