Photo-oxygenation to support nitrification in an algal-bacterial consortium treating artificial wastewater.

Autor: Karya NG; UNESCO-IHE Institute for Water Education, Department of Environmental Engineering and Water Technology, P.O. Box 3015, 2601 DA Delft, The Netherlands., van der Steen NP, Lens PN
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2013 Apr; Vol. 134, pp. 244-50. Date of Electronic Publication: 2013 Feb 11.
DOI: 10.1016/j.biortech.2013.02.005
Abstrakt: Oxygenation by photosynthesis in a mixed culture of algae and nitrifiers was investigated for its potential to support nitrification. An open photo-bioreactor (1L fermentor; 30°C) was inoculated with an enriched culture of nitrifiers obtained from activated sludge and a pure culture of Scenedesmus sp. The reactor was illuminated (60 μmol/m2 s) and operated as a sequencing batch reactor with 50% discharge per cycle and sludge retention time of 15 or 30 days. Full nitrification of synthetic wastewater (50 mgNH4+-N/L) without mechanical aeration was achieved after less than 14 cycles (18.5 h React per 24h cycle) and the biomass steadily increased until a concentration of 1.9 g VSS/L with 29 mg chl-a/L. The maximum observed nitrification rate was 7.7 mgNH4+-N/Lh. A mass balance showed that ammonium removal was primarily by nitrification (81-85%) rather than by ammonium uptake by algae.
(Copyright © 2013 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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