This is anaerobic respiration, too. Electrons are passed down an electron transport chain onto nitrate. Organisms are respiring with nitrate. MANY bacteria can do this if O2 is absent. Methanogens are very sensitive to the presence of oxygen, and for a long time could not be grown in pure culture for this reason.
Fermentation releases less energy than respiration, but are still many fermenters.
If you want to review glycolysis , you can do so at this site. Links to information about the Krebs cycle and glycolysis are available at this site.