Effect of hydraulic retention time on nitrogen removal in domestic wastewater by partial nitritation and Anammox processes

Abstract

The nitrogen treatment technology using the Anammox process is known to have advantages over conventional technology of nitrification - denitrification. For the purpose of evaluating the effect of hydraulic retention time to nitrogen removal in domestic wastewater by Anammox process, the authors conducted the study on partial nitritation and Anammox reactors, separately. Partial nitritation (PN) reactor used Felibendy plate material with Nitrosomonas bacteria while Anammox (AX) reactor used Felibendy cubes carrier material with strain Candidatus Brocadia anammoxidans. This study was implemented during 210 days. The nitrogen treatment efficiency of the system was evaluated with different hydraulic retention times (HRTs). The short HRT of 4.5 hours in the AX reactor affected to the total nitrogen treatment efficiency is low of 52.76 ± 1.29%. With the hydraulic retention times in PN + AX reactors of 9 and 6 hours, the effluent quality met the requirements of B-column according to QCVN 14:2008/BTNMT or QCVN 40:2011/BTNMT.
 Keywords:
 Nitrosomonas; Candidatus Brocadia anammoxidans; partial nitritation process; Anammox process; nitrogen treatment.