A simple quiz
This quiz is designed to help you determine if you've understood
the basic principles presented. A more intricate design problem
can be found in Metcalf and Eddy, 11-7. Click on the answer that
best answers the question.
- Examine the following statements about denitrification::
- It is an anaerobic process
- It only occurs in the presence of a few specific species of
- It involve chemical reduction
- It is invariably beneficial to the ecosystem of a receiving
body of water.
- It involves nitrogen in compounds: NO3, NO2 and N2.
Which of the above statements are true:
- I and II
- I, III, and V
- I, IV, and V
- II, III, V
You have been placed in charge a foundation that will grant $100,000
to a municipality for upgrade of their wastewater treatment facilities
to include denitrification. Four cities apply for the grant. Based
on the following geographical descriptions given, who would you
give the funds to:
- Albany -- a large city located on the Hudson River
- Miami -- a large city whose wastewater effluent is delivered
to the Atlantic Ocean
- Baltimore -- a large city perched on a major estuary
(the Chesapeake Bay)
- Minden, Nebraska -- a small agricultural town near a
- In a oxidation ditch the level of oxygen is controlled by changing
the level of the rotating brush aerators in the mixed liquor.
Why do you suppose that the rotation velocity is not just increased
- It would require more power
- The increased torque would prematurely damage the rotors.
- It doesn't really matter, either method would be effective.
- The detention times in the anaerobic zones would be insufficient.
- The town you live in is concerned that the local
lake is eutrifying. As a result, The town council is considering
upgrading the local sewage plant from secondary some form of tertiary
treatment. Which piece of information would be most helpful to
you right now(assume that the existing plant works fine):
- Phosphorus, not nitrogen is the limiting nutrient in the
- The kind of aquatic life that naturally inhabit the lake
- The strength of the influent to the sewage plant
- The pH of the lake.
Go with the flow