The oxygenic photogranule process for aeration-free wastewater treatment - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Environmental Science and Technology Year : 2018

The oxygenic photogranule process for aeration-free wastewater treatment


This study presents the oxygenic photogranule (OPG) process, a light-driven process for wastewater treatment, developed based on photogranulation of filamentous cyanobacteria, nonphototrophic bacteria, and microalgae. Unlike other biogranular processes requiring airlift or upflow-based mixing, the OPG process was operated in stirred-tank reactors without aeration. Reactors were seeded with hydro-statically grown photogranules and operated in a sequencing batch mode for five months to treat wastewater. The new reactor biomass propagated with progression of photo granulation under periodic light/dark cycles. Due to effective biomass separation from water, the system was operated with short settling time (10 min) with effective decoupling of hydraulic and solids retention times (0.75 d vs 21-42 d). During quasi-steady state, the diameter of the OPGs ranged between 0.1 and 4.5 mm. The reactors produced effluents with average total chemical oxygen demand less than 30 mg/L. Nitrogen removal (28-71%) was achieved by bioassimilation and nitrification/denitrification pathways. Oxygen needed for the oxidation of organic matter and nitrification was produced by OPGs at a rate of 12.6 +/- 2.4 mg O-2/g biomass-h. The OPG system presents a new biogranule process, which can potentially use simple mixing and natural light to treat wastewater.
Fichier principal
Vignette du fichier
Abouhend-et-al_2018_reviewed-version.pdf (6.58 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-02626952 , version 1 (06-07-2023)



Ahmed S. Abouhend, Adam Mcnair, Wenye C. Kuo-Dahab, Christopher Watt, Caitlyn S. Butler, et al.. The oxygenic photogranule process for aeration-free wastewater treatment. Environmental Science and Technology, 2018, 52 (6), pp.3503-3511. ⟨10.1021/acs.est.8b00403⟩. ⟨hal-02626952⟩
58 View
11 Download



Gmail Facebook X LinkedIn More