Original scientific paper
https://doi.org/10.15255/KUI.2022.034
Nitrogen Removal with Aerobic Granules – Effect of Dissolved Oxygen and Carbon/Nitrogen Ratio
Mirjana Galant
; Usluga odvodnja d. o. o., Šime Kurelića 22, 52 000 Pazin, Croatia
Dijana Grgas
orcid.org/0000-0003-0687-6524
; University of Zagreb, Faculty of Food Technology and Biotechnology, Pierottijeva ulica 6, 10 000 Zagreb, Croatia
Tea Štefanac
; University of Zagreb, Faculty of Food Technology and Biotechnology, Pierottijeva ulica 6, 10 000 Zagreb, Croatia
Mirna Habuda-Stanić
orcid.org/0000-0002-0089-9488
; J. J. Strossmayer University of Osijek, Faculty of Food Technology Osijek, F. Kuhača 18, 31 000 Osijek, Croatia
Tibela Landeka Dragičević
; University of Zagreb, Faculty of Food Technology and Biotechnology, Pierottijeva ulica 6, 10 000 Zagreb, Croatia
Abstract
Nitrogen removal efficiency related to the dissolved oxygen (DO) concentration (DO 1–7 mg l–1), carbon/nitrogen ratio (COD/N 1–14), and the effect of airflow (0.4–2.9 l min–1) related to the granule size were investigated. The average chemical oxygen demand (COD) removal of ≥ 90 % was achieved at COD/N ≥ 11, but the satisfactory N values in effluent for discharge into the surface waters were almost achieved at COD/N 14. DO of 2 mg l–1 is recommended for efficient removal of N and COD with mature granules. The size (diameter) of the granules decreases with increased airflow.
Keywords
aerobic granules; COD removal; N removal; sodium acetate; synthetic wastewater
Hrčak ID:
291056
URI
Publication date:
11.1.2023.
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