Wastewater Treatment Systems Comparison

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What is the main characteristic of aeration lagoons?

Oval or race-track channel equipped with mechanical aerators

Completely mixed stirred tank reactor

Influent flows into the tank at several locations

Continuous air injection at the bottom (correct)

Which configuration provides the benefits of plug flow and completely mixed reactor in one tank?

Step feed

Plug flow

Oxidation ditch (correct)

Complete mix

What is the process where the influent is immediately diluted with the tank contents, resulting in uniform substrate concentration and dissolved oxygen?

Complete mix (correct)

Step feed

Tapered aeration

Plug flow

Which process involves flow entering one end of a long narrow tank and exiting at the other end?

Plug flow Signup and view all the answers

In which configuration does the influent flow into the aeration tank at several locations along its length?

Step feed Signup and view all the answers

Which configuration involves an oval or race-track channel equipped with mechanical aerators?

Oxidation ditch Signup and view all the answers

What is required for achieving a high nitrate removal efficiency in the single sludge process?

A long detention time in the anoxic tank Signup and view all the answers

In the Bardenpho (4-stage) denitrification process, what was discovered to occur in actual practice besides nitrate removal?

Phosphorus removal Signup and view all the answers

What is one of the requirements for achieving biological nutrient removal (BNR) in an oxidation ditch?

Longer oxidation ditch to provide an anoxic zone Signup and view all the answers

What characterizes a hybrid process that combines suspended growth and attached growth microorganisms?

Combines suspended and attached growth microorganisms Signup and view all the answers

In the extended aeration process, what role does the long sludge retention times play?

Enhances BOD removal efficiency Signup and view all the answers

What is one of the key factors for efficient denitrification in the modified Ludzack-Ettinger process?

Maintaining a longer hydraulic detention time in the postanoxic stage Signup and view all the answers

What is the main advantage of a tapered aeration system compared to step feeding?

Reduces power costs and equipment sizes Signup and view all the answers

How long is process aeration extended in extended aeration treatment?

24 hours or more Signup and view all the answers

What is a key requirement for biological nitrogen removal during denitrification?

Both an aerobic and anoxic zone Signup and view all the answers

Which process relies on the return of nitrate from the aerobic zone to the anoxic zone?

Modified Ludzack-Ettinger (MLE) Signup and view all the answers

How does the step feed process differ when modified for denitrification?

Final flow portion to last anoxic/aerobic zone is critical Signup and view all the answers

What additional operational step modifies the SBR system for BOD oxidation and nitrification?

Selector configuration Signup and view all the answers