Effect of Inorganic Carbon on ANAMMOX in Anaerobic Sequencing Batch Reactor

The research reveals the enrichment of ANAMMOX bacterium and the effect of inorganic carbon on ANAMMOX in anaerobic sequencing bath reactor(ASBR).The enrichment of ANAMMOX bacterium was carried out in a 8.0 L ASBR,and the effect of inorganic carbon on ANAMMOX was carried out in a 4.0 L ASBR.Research results showed the first signs of ANAMMOX activity after 55 days cultivation;ANAMMOX bacterium became the dominant species at 85 days;At 140 days,the system ran steadily,NH4+-N and NO2——N removal rate were very high,and the color of sludge changed from gray to pink gradually.The ANAMMOX activity increased as the influent bicarbonate concentration increased from 1.0 to 1.4 g/L,and then,was inhibited as bicarbonate concentration increased to 2.0 g/L.However,the activity could be restored by the reduction of bicarbonate concentration to 1.0 g/L.