Nitrite and nitrate inhibition thresholds for a glutamate-fed bio-P sludge
Yükleniyor...
Dosyalar
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Pergamon-Elsevier Science Ltd
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Enhanced biological phosphorus removal (EBPR) is an efficient and sustainable technology to remove phosphorus from wastewater. A widely known cause of EBPR deterioration in wastewater treatment plants (WWTPs) is the presence of nitrate/nitrite or oxygen in the anaerobic reactor. Moreover, most existing studies on the effect of either permanent aerobic conditions or inhibition of EBPR by nitrate or free nitrous acid (FNA) have been conducted with a Candidatus Accumulibacter or Tetrasphaera-enriched sludge, which are the two major reported groups of polyphosphate accumulating organisms (PAO) with key roles in full-scale EBPR WWTPs. This work reports the denitrification capabilities of a bio-P microbial community developed using glutamate as the sole source of carbon and nitrogen. This bio-P sludge exhibited a high denitrifying PAO (DPAO) activity, in fact, 56% of the phosphorus was uptaken under anoxic conditions. Furthermore, this mixed culture was able to use nitrite and nitrate as electron acceptor for P-uptake, being 1.8 mu g HNO2-N.L- 1 the maximum FNA concentration at which P-uptake can occur. Net P-removal was observed under permanent aerobic conditions. However, this microbial culture was more sensitive to FNA and permanent aerobic conditions compared to Ca. Accumulibacter-enriched sludge.
Açıklama
Anahtar Kelimeler
Enhanced biological phosphorus removal (EBPR), Denitrifying polyphosphate accumulating organisms (DPAO), Free nitrous acid (FNA), Nitrate, Inhibition, Biological Phosphorus Removal, Free Nitrous-Acid, Polyphosphate-Accumulating Organisms, Sole Carbon Source, Waste-Water, Activated-Sludge, Phosphate-Uptake, Community Structure, Aerobic Conditions, Oxide Production
Kaynak
Chemosphere
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
283
