Exam (elaborations)
WASTEWATER OPERATOR EXAM PREP QUESTIONS AND ANSWERS
- Course
- Institution
WASTEWATER OPERATOR EXAM PREP QUESTIONS AND ANSWERS
[Show more]
Content preview
Name: Score:100 Multiple choice questions
Term 1 of 100
What is the purpose of a clarifier effluent weir?
To enhance the aesthetic appearance of the clarifier
To measure the volume of water leaving the clarifier
To ensure equal flow over all weirs
To prevent the accumulation of debris at the weirs
Term 2 of 100
What factor usually influences the degree and number of treatment processes at a treatment
plant?
Protection of public health
Use of the receiving waters
To protect receiving waters from the toxic effects of residual chlorine
Types of solids in the wastewater and proper sludge withdrawal
Term 3 of 100
How does preliminary treatment protect the wastewater treatment plant operation
to prevent hearing loss that might affect an operators ability to hear and understand
speech
by removing materials from the wastewater that can damage or clog pumps or
interference with other treatment processes
to prevent overloading or shock loading the plant
data from the results of laboratory control tests
,Term 4 of 100
If the flow rate is 10.6 ft3/s in a grit chamber with a rectangular cross section 6 ft wide and a
water depth of 2 ft, how long must the chamber be (in ft) to capture particles with a settling
velocity of 0.075 ft/s?
to protect receiving waters from the toxic effects of residual chlorine
23.5 ft
Q=AV
10.6 ft3/s = A x 0.075 ft/s
A= 140.3 ft2
A= L x W
140.3 ft2 = L x 6 ft
L= 23.5 ft
development and enforcement of sewer-use ordinances and industrial pre-treatment
inspection programs
A tank with a sloping bottom, a hopper or trough in the lower end, and diffusers along
the wall.
Term 5 of 100
why do operators use the term BOD/COD?
to indicate they are using OCD to estimate the BOD for process control
to compare the efficiency of different treatment methods
to show the relationship between chemical and biological treatment
to measure the effectiveness of filtration systems
Term 6 of 100
Where is sludge dewatering accomplished?
During grit removal
Slipping and skin injuries
Lagoons and filter presses
Hair, fats, oils, and plastics
,Term 7 of 100
How is captured grit removed from grit channels?
Pumped up as slurry to the cyclone separator
Allowed to settle at the bottom of the channel
Discharged directly into the main treatment tank
Removed manually by operators using buckets
Term 8 of 100
What is one tool operators use to identify developing treatment problems, determine the
efficiency of treatment unit processes, and select the most efficient operational procedures?
Visual inspections of treatment facilities
Data from the results of laboratory control tests
Historical data on previous treatment failures
Feedback from local community members
Term 9 of 100
why should operators refrain from dewatering inground clarifiers during high groundwater
conditions?
to ensure that the clarifier operates at maximum efficiency
to facilitate easier access for maintenance personnel
to avoid the possibility of the clarifier floating on high groundwater
to allow for the addition of more sludge without overflow
, Term 10 of 100
How much grit should treatment plants with well constructed, separate wastewater collection
systems expect on average?
5 to 8 ft3 of grit per million gallons of water
0.5 to 1 ft3 of grit per million gallons of water
10 to 15 ft3 of grit per million gallons of water
1 to 4 ft3 of grit per million gallons of water
Term 11 of 100
How do preventative maintenance programs help operators?
aid in detecting and correcting malfunctions before they develop into major problems
and keep equipment in satisfactory operating condition
increase the speed of wastewater processing
provide training for new operators on equipment usage
ensure compliance with environmental regulations
Term 12 of 100
Why are Parshall flumes the most common flow measuring device?
because the smooth constriction prevents areas where wastewater particles may catch
or collect behind metering devices
because they require no maintenance or calibration
because they are the cheapest option for flow measurement
because they can measure flow in both directions simultaneously
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller selftest. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.00. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now