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Wastewater Treatment Quiz
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Wastewater Treatment Quiz

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Questions and Answers

What is the primary purpose of a confined space entry permit in a drained anaerobic digester?

  • To ensure safety when working in the digester (correct)
  • To monitor the pH level in the digester
  • To assess the volatile solids removal efficiency
  • To ensure that the digester is completely empty

    • Why are vents in a chlorine storage room located at ground level?

  • To prevent chlorine from escaping into the atmosphere
  • To facilitate the movement of chlorine throughout the room
  • To allow for easy access during maintenance
  • To prevent the accumulation of chlorine at higher levels (correct)

    • What does the F in the F to M ratio refer to in an activated sludge plant?

  • Fraction of mixed liquor volatile suspended solids under aeration (correct)
  • Flow rate of wastewater entering the plant
  • Filtration capacity of the plant
  • Frequency of sludge removal from the plant

    • What is the significance of a wastewater sample with a pH of 7.2 being slightly acidic?

    <p>It shows that the wastewater is close to being neutral</p> Signup and view all the answers

    What are BOD5 and SS primarily used to measure in relation to wastewater?

    <p>Strength and content of the wastewater</p> Signup and view all the answers

    What does a low pH in septic sludge indicate?

    <p>Potential for odor and nuisance issues</p> Signup and view all the answers

    Total wastewater solids is the sum of total dissolved solids and suspended solids. Is this statement true or false?

    <p>True</p> Signup and view all the answers

    In a facultative pond, the bottom layer of the pond generally contains more dissolved oxygen than the surface layer. Is this statement true or false?

    <p>False</p> Signup and view all the answers

    The pH falls in a facultative pond when carbon dioxide produced by aerobic bacteria is consumed by algae. Is this statement true or false?

    <p>False</p> Signup and view all the answers

    It is recommended to start up a pond in the coldest months of the year in order to avoid odor problems and take advantage of the increased solubility of oxygen in cold water. Is this statement true or false?

    <p>True</p> Signup and view all the answers

    Tertiary (polishing) ponds typically receive raw (untreated wastewater) as the feed stream. Is this statement true or false?

    <p>False</p> Signup and view all the answers

    A Venturi meter measures the amount of electricity used and should be read when there is a high electrical demand. Is this statement true or false?

    <p>False</p> Signup and view all the answers

    Activated sludge is an anaerobic process. Is this statement true or false?

    <p>False</p> Signup and view all the answers

    The process of pre-aeration in no way influences the degree of settling in a primary clarifier. Is this statement true or false?

    <p>False</p> Signup and view all the answers

    Gas bubbles rising to the surface in a primary clarifier are normally an indication that the sludge in the unit is undergoing proper settling. Is this statement true or false?

    <p>True</p> Signup and view all the answers

    Conductivity is a very useful test for assessing sea water intrusion into sewer lines. Is this statement true or false?

    <p>True</p> Signup and view all the answers

    Grab or composite samples may be used interchangeably, whichever is most convenient and safest for all laboratory tests. Is this statement true or false?

    <p>False</p> Signup and view all the answers

    A 30-minute settleability test MLSS sample should be collected from:

    <p>At the aeration basin outlet</p> Signup and view all the answers

    What does ponding of a trickling filter indicate?

    <p>Blockage in the media that prevents water to flow through</p> Signup and view all the answers

    What is the most likely effect of algae in a stabilization pond?

    <p>Changing the pH throughout the day</p> Signup and view all the answers

    At what time of day is the dissolved oxygen content highest in a lagoon?

    <p>3 p.m.</p> Signup and view all the answers

    What does hydraulic loading to a facultative pond equal?

    <p>Depth (inches) divided by Detention Time (days)</p> Signup and view all the answers

    Which type of pond is it important to completely mix and aerate?

    <p>Aerobic</p> Signup and view all the answers

    What is an Imhoff cone commonly used to measure?

    <p>mL/L</p> Signup and view all the answers

    What percent of the influent settleable solids is expected to be removed by an efficient primary clarifier?

    <p>90 % or better</p> Signup and view all the answers

    What is the calculated MCRT value for the given scenario?

    <p>5.0 days</p> Signup and view all the answers

    Approximately how many gallons of wastewater would 600 feet of 6-inch diameter pipe hold?

    <p>880</p> Signup and view all the answers

    What is the volatile solids reduction in the anaerobic digester?

    <p>52.3%</p> Signup and view all the answers

    What is the trickling filter effluent flow that needs to be recirculated for the desired recirculation ratio?

    <p>6.2 MGD</p> Signup and view all the answers

    How many pounds per day should the chlorinator be set to deliver for the given chlorine demand and desired residual?

    <p>130</p> Signup and view all the answers

    What is the velocity of a 3 MGD flow in a 12-inch diameter pipe?

    <p>5.9 ft/s</p> Signup and view all the answers

    What is the detention time of a 40 acre wastewater treatment pond for the given flow rate and operating depth?

    <p>87 days</p> Signup and view all the answers

    What is the grit production rate if 46 cu. ft of grit is removed every five days for a daily plant flow of 2 MGD?

    <p>4.6 cu. ft/MG</p> Signup and view all the answers

    How many gallons does a primary clarifier with a detention time of 2 hours hold at a flow rate of 2.5 MGD?

    <p>208</p> Signup and view all the answers

    How long will it take to pump down 25 feet of water in a cylindrical tank with a diameter of 110 ft using a 1,420 gpm pump?

    <p>20 hours and 51 minutes</p> Signup and view all the answers

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