The Effect of Change in Temperature and Exposure of Sulfide and Heavy Metals in Anammox Process

The effect of change in temperature, exposure of sulfide, lead, mercury, arsenite and cyanide on anammox activity was studied. Specific anammox activity (SAA) reduced from about 0.4 to 0.25 g N/g VSS d when the temperature dropped from 35 to 21°C and reduced to 0.05 g N/g VSS d at 13°C. Sulfide was also found to have a tremendous negative effect on SAA, where the anammox activity decreased with the increasing sulfide concentrations. Severe decrease in SAA for CN- concentration of 0.5 mg/L and Hg2+ concentration of 0.8 mg/L was observed. A slight decrease in SAA was seen at Pb2+ concentration of 0.8 mg/L. A multi-day inhibition test performed to study the recovery response. Partial recovery of SAA for maximum CN- concentration 0.15 mg/L and Hg2+ concentration of 5 mg/L was observed