Sulfammox process_task 1

Anaerobic ammonia-oxidizing bacteria have a more comprehensive metabolism thanexpected - there may be other electron acceptors that oxidize ammonium nitrogen under anaerobicconditions, in addition to the well-known nitrite nitrogen, one of which is sulfate in the sulfammoxprocess. Sulfate-containing compounds are part of the medium for the anammox process, but theirconcentrations are not particularly high (0.2 g MgSO4 ∙ 7H2O/dm3 and 0.00625 g FeSO4/dm3). Theycan react to some extent with influent ammonium nitrogen. In this work, tests were carried out intwo sequencing batch reactors with granular sludge. The first reactor (R1) operated in a 6 hour cycle,and the concentration of the inflowing sulfate was kept at 44 mg/dm3∙d. The second reactor (R2) wasoperated until the 36th day in a 6 hour cycle; the influencing concentration was 180 mg SO42−/dm3∙dfrom the 37th to 64th day in a 3 hour cycle, with an influencing concentration of 360 mg SO42−/dm3∙d;and from the 65th to 90th day, the reactor was operated again in a 6 hour cycle with an influencingconcentration of 180 mg SO42−/dm3∙d. Along with the increased share of sulfate, both the ammoniumutilization rate and specific anammox activity showed an increasing trend. As soon as the sulfatedosage was reduced, the ammonium utilization rate and specific anammox activity values dropped.Therefore, it can be concluded that sulfate-containing compounds contribute to the efficiency andrate of the anammox process.