Alternative processes of nitrogen removal from wastewater — startup of nitritation reactor
Department of Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinskeho 9, 812 37 Bratislava, Slovak Republic
Abstract: Efficient nitritation was tested in SBR with the aim to accumulate nitrites and to minimize nitrates production in reject wastewater with 500 mg L–1 (NH4++NH3)-N and with different molar ratios of HCO3– : (NH4++ NH3)-N (1.1—2.1). More than 80 % efficiency of nitritation and permanent inhibition of NOB were achieved at the ratios of 1.7—1.9 and at the loading of 0.16—0.6 kg (NH4+ + NH3)-N m–3 d–1. Under these conditions, the outflow pH was in the range of 5.9—6.5, outflow c (NO2– + HNO2)-N increased up to 400 mg L–1 and c (NO3–)-N dropped below 50 mg L–1. Undissociated HNO2 was confirmed as the main inhibitor of NOB.
Keywords: AOB, nitritation, NOB inhibition, sequencing batch reactor, sludge reject water
Full paper in Portable Document Format: acs_0274.pdf
Acta Chimica Slovaca, Vol. 10, No. 1, 2017, pp. 70—73, DOI: 10.1515/acs-2017-0012