Acta Chimica Slovaca (ACS) publishes papers on fundamental and applied aspects of chemistry, biochemistry, chemical technology, chemical engineering and process control, biotechnology and food technology. Welcome are also topics which include chemical aspects of materials, physical chemistry and chemical physics, analytical chemistry, macromolecular chemistry and biomedical engineering.

Alternative processes of nitrogen removal from wastewater — startup of nitritation reactor

Ngoc Cao Thanh Hong *, Stanislava Vlčková, Miloslav Drtil

Department of Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinskeho 9, 812 37 Bratislava, Slovak Republic

E-mail: *,,

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 HNOwas 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