H. Siegrist et al., NITROGEN LOSS IN A NITRIFYING ROTATING CONTACTOR TREATING AMMONIUM RICH LEACHATE WITHOUT ORGANIC-CARBON, Water science and technology, 37(4-5), 1998, pp. 589-591
Citations number
3
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
Extended loss (up to 70%) of nitrogen is observed in a nitrifying rota
ting biological contactor (RBC) treating ammonium - rich leachate of a
hazardous waste landfill. Due to pretreatment (flocculation, POD-remo
val activated carbon) DOC was less than 20 mg/l so heterotrophic denit
rification can be excluded. The nitrification rate reaches 3-4 g NH4-N
m(-2) d(-1) at a pH of 7-7.3 in the first two of three RBC compartmen
ts. An increasing partial pressure of oxygen and ammonium concentratio
n favor nitrogen removal over ammonium oxidation. The reduction of nit
rite produced in the aerobic biofilm layer close to the surface might
therefore be coupled with ammonium oxidation and takes place in the de
eper or temporarily anoxic layer of the biofilm. (C) 1998 IAWQ. Publis
hed by Elsevier Science Ltd.