_____ devices remove materials which would damage equipment or interfere with a process.

In ______ reactor the bed is filled with a packing material that expands when wastewater moves upwards.

_________ is simply detaining water for a sufficient time.

In which type of reactor, mixing is uniform?

__________ represents the heavier inert matter in wastewater.

Refrigeration is a mass transfer process.

__________ is a process which involves further removal of the nitrogen.

Which process is employed to gain sufficient head for the wastewater?