Nitrogen fixation is the conversion of _____into nitrogen compounds.

RO membranes are made of ___

______ is the biochemical degradation of Organic-N into NH3 or NH4+.

Which of the following bacteria is used in nitrification process?

What is the minimum mass loading of nitrogen in domestic wastewater?

What is the diameter assumed for hollow fine membranes for treating brackish water?

A sludge blanket in the reactor is __

Total dissolved solids consist of cations only.