Stimulation of Nitritation and Changes in Nitrifying Bacterial Microflora in a DHS Reactor by Controlling Salinity

Abstract

The effect of salinity on nitritation in a Down-flow Hanging Sponge (DHS) reactor was evaluated through a longterm continuous experiment for 700 days. The DHS reactor was fed with artificial wastewater containing 100 mg-N • L -1 ammonium nitrogen (HRT = 2 h, 20-25˚C). The salinity of the influent was controlled by adding NaCl at concentrations of 5 to 18 g-Cl