Influence of salinity on partial nitrification in a submerged biofilter
2012
Aslan, Şükrü | Şimşek, Erdal
Partial nitrification under various concentrations of NaCl (0–40g/l) at a constant operational condition was investigated in a submerged biofilter reactor. The highest NO₂–N/NOₓ–N ratio (0.76) was achieved at the NLR of 830g NH₄–N/m³ day with salt free wastewater. Small increase the salt content led to higher activities and the NH₄–N removal efficiency increased from 92% to 95% at 1g/l NaCl concentration. Over this concentration, each NaCl addition provoked the NH₄–N oxidation and a sharp increase of inhibition was observed. The total oxidized NH₄–N was achieved at the nitrogen loading rate (NLR) and surface loading rate (SLR) of 0.754kg/m³day and 3.23g/m²day, respectively without salt in the feed wastewater and it was decreased to 0.322kg/m³ day and 1.38g/m²day at the salinity of 40g/l in the PNBR.
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