Podcast
Questions and Answers
What is the primary purpose of a confined space entry permit in a drained anaerobic digester?
What is the primary purpose of a confined space entry permit in a drained anaerobic digester?
Why are vents in a chlorine storage room located at ground level?
Why are vents in a chlorine storage room located at ground level?
What does the F in the F to M ratio refer to in an activated sludge plant?
What does the F in the F to M ratio refer to in an activated sludge plant?
What is the significance of a wastewater sample with a pH of 7.2 being slightly acidic?
What is the significance of a wastewater sample with a pH of 7.2 being slightly acidic?
Signup and view all the answers
What are BOD5 and SS primarily used to measure in relation to wastewater?
What are BOD5 and SS primarily used to measure in relation to wastewater?
Signup and view all the answers
What does a low pH in septic sludge indicate?
What does a low pH in septic sludge indicate?
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?
Total wastewater solids is the sum of total dissolved solids and suspended solids. Is this statement true or false?
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?
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?
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?
The pH falls in a facultative pond when carbon dioxide produced by aerobic bacteria is consumed by algae. Is this statement true or false?
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?
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?
Signup and view all the answers
Tertiary (polishing) ponds typically receive raw (untreated wastewater) as the feed stream. Is this statement true or false?
Tertiary (polishing) ponds typically receive raw (untreated wastewater) as the feed stream. Is this statement true or false?
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?
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?
Signup and view all the answers
Activated sludge is an anaerobic process. Is this statement true or false?
Activated sludge is an anaerobic process. Is this statement true or false?
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?
The process of pre-aeration in no way influences the degree of settling in a primary clarifier. Is this statement true or false?
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?
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?
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?
Conductivity is a very useful test for assessing sea water intrusion into sewer lines. Is this statement true or false?
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?
Grab or composite samples may be used interchangeably, whichever is most convenient and safest for all laboratory tests. Is this statement true or false?
Signup and view all the answers
A 30-minute settleability test MLSS sample should be collected from:
A 30-minute settleability test MLSS sample should be collected from:
Signup and view all the answers
What does ponding of a trickling filter indicate?
What does ponding of a trickling filter indicate?
Signup and view all the answers
What is the most likely effect of algae in a stabilization pond?
What is the most likely effect of algae in a stabilization pond?
Signup and view all the answers
At what time of day is the dissolved oxygen content highest in a lagoon?
At what time of day is the dissolved oxygen content highest in a lagoon?
Signup and view all the answers
What does hydraulic loading to a facultative pond equal?
What does hydraulic loading to a facultative pond equal?
Signup and view all the answers
Which type of pond is it important to completely mix and aerate?
Which type of pond is it important to completely mix and aerate?
Signup and view all the answers
What is an Imhoff cone commonly used to measure?
What is an Imhoff cone commonly used to measure?
Signup and view all the answers
What percent of the influent settleable solids is expected to be removed by an efficient primary clarifier?
What percent of the influent settleable solids is expected to be removed by an efficient primary clarifier?
Signup and view all the answers
What is the calculated MCRT value for the given scenario?
What is the calculated MCRT value for the given scenario?
Signup and view all the answers
Approximately how many gallons of wastewater would 600 feet of 6-inch diameter pipe hold?
Approximately how many gallons of wastewater would 600 feet of 6-inch diameter pipe hold?
Signup and view all the answers
What is the volatile solids reduction in the anaerobic digester?
What is the volatile solids reduction in the anaerobic digester?
Signup and view all the answers
What is the trickling filter effluent flow that needs to be recirculated for the desired recirculation ratio?
What is the trickling filter effluent flow that needs to be recirculated for the desired recirculation ratio?
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?
How many pounds per day should the chlorinator be set to deliver for the given chlorine demand and desired residual?
Signup and view all the answers
What is the velocity of a 3 MGD flow in a 12-inch diameter pipe?
What is the velocity of a 3 MGD flow in a 12-inch diameter pipe?
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?
What is the detention time of a 40 acre wastewater treatment pond for the given flow rate and operating depth?
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?
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?
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?
How many gallons does a primary clarifier with a detention time of 2 hours hold at a flow rate of 2.5 MGD?
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?
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?
Signup and view all the answers
