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The effect of salinity on nitritation in a Down-flow Hanging Sponge (DHS) reactor was evaluated through a long-term 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-·L-1. The effluent nitrite concentration increased with increasing of salinity, i.e., the nitrite concentration increased up to approximately 60% of the total nitrogen in the effluent at 18 g-Cl-·L-1. The nitrifying bacterial community in the DHS markedly changed at the species level. For example, the dominant nitrite-oxidizing bacteria changed from Nitrospira-sublineage I at 0 g-Cl-·L-1 to Nitrobacter spp. at 18 g-Cl-·L-1.

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