Which of the following is not true regarding mechanical aeration?

The _____ is usually the same length in time as the aeration.

______ weather requires large oxygen transfer.

The surface area of facultative ponds should be small.

Moving bed reactors are closed systems.

MBBR was developed based on the activated sludge process and _____

Which of the following methods consume the least power?

The multiplication of _____ is encouraged by the addition of oxygen.