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34 Cards in this Set
- Front
- Back
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When wastewater remains in the collection system too long it tends to become...
a) Septic b) Organic c) Alkaline d) Inorganic |
a) Septic
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Heavy organic material and grit will begin to settle out of wastewater flowing in grit channels at a velocity of
a) 2.0 fps b) 1.5 fps c) 2.5 fps d) 3.0 fps |
b) 1.5 fps
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Chlorine is added to the ____ effluent for disinfection purposes.
a) Trickling Filter b) Sludge digester c) Secondary clarifier d) Aeration tank |
c) Secondary clarifier
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Detritus is another name for
a) Scum b) Filamentious organism c) Grit d) Grease |
c) Grit
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An aerated grit chamber will
a) Increase BOD in wastewater being treated b) Improve downstream process performance c) Prevent clogging of flow measuring devices d) Increase TSS in wastewater being treated |
b) Improve downstream process performance
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What should be done FIRST when a problem develops in a mechanically cleaned screen?
a) Attempt to fix the screen with the proper tools b) Reach in and attempt to clear the debris by hand. c) Consult the O&M manual d) Turn off the electrical power to the screen, tag and lock out |
d) Turn off the electrical power to the screen, tag and lock out
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The grit removal from the grit chamber contains a large amout of organic material in it. The best rememdy for this is to
a) Increase the velocity in the grit chamber b) Decrease the velocity in the grit chamber c) Add chlorine to the influent d) Change nothing. Grit commonly contains large amount of organic material |
a) Increase the velocity in the grit chamber
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Secondary or final clarifiers
a) Remove biological solids from wastewater b) Increase sludge production c) Increase sludge digestion d) Provide dampening for high flows |
a) Remove biological solids from wastewater
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Who specifies the sample type, preservation method, and test method for effluent samples?
a) Superintendent b) Lab Supervisor c) EPD d) NPDES Permit |
d) NPDES Permit
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Sludge Bulking is a condition in which sludge becomes
a) Too light to settle b) Too dense to settle c) Septic d) Biologically inactive |
a) Too light to settle
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The treatment that always precedes the RBC process and the Trickling Filter process is called
a) Secondary treatment b) Sludge Digestion c) Primary clarification d) Activiated Sludge |
c) Primary clarification
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Which test BEST measures the efficiency of a trickling filter?
a) pH b) Total Suspended Solids c) Temperature d) BOD |
d) BOD
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The purpose of flow equalization in general is
a) Balance flows, dilute strong wastes and impound excessive flows temporarily b) Remove phosphorous c) Neutralize strong acid wastes d) Aerate the influent |
a) Balance flows, dilute strong wastes and impound excessive flows temporarily
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Which of the following factors could cause a demand for more oxygen in an aeration tank?
a) Increase in microorganisms b) Ph c) Increase in toxic substances d) Increase in inert or inorganic wastes |
a) Increase in microorganisms
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Oxygen transfer in an oxidation ditch is increased by
a) Raising the effluent weir, thus increasing the depth of liquid in the ditch b) Lowering the efflent weir, thus decreasing the depth fo liquid in the ditch c) Increasing the sludge age of the system d) Incresing the recirculation rate |
a) Raising the effluent weir, thus increasing the depth of liquid in the ditch
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Most extended aeration processes have
a) Shorter sludge ages b) Longer sludge ages c) Land applications d) Tertiary treatment |
b) Longer sludge ages
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Where does the term "activated" come from in the ACTIVATED SLUDGE PROCESS?
a) Activated air is used in the process b) The plant must be activated before the wastewater is treated c) Activated carbon is used in the process d) The sludge particles are teaming with bacteria, fungi and protozoa |
d) The sludge particles are teaming with bacteria, fungi and protozoa
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Facultative ponds are
a) Aerobic on the top and anaerobic on the bottom b) Faulty designs c) Completely aerobic d) Completely anaerobic |
a) Aerobic on the top and anaerobic on the bottom
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Observation which indicate that a pond is well operated or being maintained properly include
a) A definite green color of the pond b) Duck weed floating on the surface c) Scum mats d) Tules growing along the edge of the pond |
a) A definite green color of the pond
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Which of the following items are NOT a main component of a centrifugal pump?
a) Volute b) Impeller c) Shaft and packing d) H.O.A. switch |
d) H.O.A. switch
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The dissolved oxygen in a pond system is a result of
a) Photosynthesis b) BOD c) Bacteria d) Oxidation |
a) Photosynthesis
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Disease causing bacteria are called
a) Fecal Coliform b) Total Coliform c) Pathogenic d) Thermophilic |
c) Pathogenic
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Chlorine is commonly applied to the effluent of a treatment plant for
a) Sterilization b) Oxidation c) Settling d) Disinfection |
d) Disinfection
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An increase in the plant effluent coliform level could be caused by
a) Increasing effluent solids b) Mixing problems in the contact tank c) Low chlorine dosage d) All of the above |
d) All of the above
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Which of the pH readings indicates an acidic wastewater
a) 3 b) 7 c) 9 d) 12 |
a) 3
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"Coning" refers to
a) Bacteria that come together to form a neutrally buoyant floc b) Sludge that is removed too quickly from a sludge blanket c) A condition that occurs in a centrifugal sludge pump d) The welling effect seen in rectangular clarifiers |
b) Sludge that is removed too quickly from a sludge blanket
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Chlorine leaks may be detected by using
a) Water b) A flashlight c) Ammonia solution d) Sulfur dioxide |
c) Ammonia solution
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Which of the following test reveal the most meaningful operating information on an anaerobic digester?
a) BOD b) TSS c) pH d) VA:ALK |
d) VA:ALK
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Results from the settleability test for Activated Sludge solids may be used to
a) Calculate MLSS b) Calculate SVI c) Calculate F:M d) Calculate BOD |
b) Calculate SVI
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An oxygen deficiency or dangerous concentration of toxic or explosive gases, may be found in
a) Chlorinator rooms b) Empty digester c) Manholes d) All the above |
d) All the above
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Coliform bacteria are
a) Algae b) Coagulant Aids c) Indicators d) Sequestering agents |
c) Indicators
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A positive displacement pump should never be started against a closed valve because the
a) Resulting pressure may damage the line, pump and motor b) Valve may be damaged c) Sludge will be pumped back into the clarifier d) Pump will not start with the valve closed |
a) Resulting pressure may damage the line, pump and motor
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Calculating the SVI in the activated sludge process requires which information?
a) Settleability and DO b) Volatile Acids and Alkalinity c) Settleability and mixed liquor suspended solids d) Settleability and F:M ratio |
c) Settleability and mixed liquor suspended solids
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Calculate the detention time in the following tank:
Influent flow is .456MGD Length is 125 feetm width is 60 feet and depth is 6 feet. a) 18 hours b) .73 hours c) 20 hours d) 1.35 hours |
a) 18 hours
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