Importance of ecological interactions during wastewater treatment using High Rate Algal Ponds under different temperate climates Gales A. auteur aut IRD Bonnafous A. auteur aut IRD Carré Claire auteur aut IRD Jauzein V. auteur aut IRD Lanouguere E. auteur aut IRD Le Floc'h E. auteur aut IRD Pinoit J. auteur aut IRD Poullain C. auteur aut IRD Roques C. auteur aut IRD Sialve B. auteur aut IRD Simier Monique auteur aut IRD Steyer J. P. auteur aut IRD Fouilland E. auteur aut IRD text journalArticle eng text/pdf born digital access Several studies focused on wastewater treatment in High Rate Algal Ponds (HRAP) suggest that highly variable climatic conditions cause large variations of microalgal biomass productivity. In the present study, we show that similar carbon, nitrogen and phosphorus removal efficiencies were reached in different HRAPs treating urban wastewaters located in two different temperate (Mediterranean and oceanic) climates. Furthermore, similar ecological successions were observed in these HRAPs. During the start-up phase, the consumption of organic matter by detritivores, already present in the wastewater, appears to be necessary for the microalgae to grow within two weeks in spring. The growth of the rapid-growing species, Chlorella sp., followed by the grazing-resilient species, Scenedesmus sp., combined with nitrifying and denitrifying bacterial activity, removed most the ammonia. The resulting exhaustion of ammonia would limit the complete removal of dissolved COD by bacteria and phosphate by microalgae in the HRAPs. This study shows that similar biological and environmental constraints were applied on the HRAPs, making the process efficiency highly reproducible under different temperate latitudes. specialized Microalgae Predators Bacteria Urban effluents Ammonia and phosphate removal FRANCE ZONE TEMPEREE 084 038 020 021 Algal Research : Biomass Biofuels and Bioproducts 40 art. 101508 [9 p.] 2019 2211-9264 https://www.documentation.ird.fr/hor/fdi:010075701 10.1016/j.algal.2019.101508 2211-9264 [F B010075701] https://www.documentation.ird.fr/hor/fdi:010075701 https://www.documentation.ird.fr/intranet/publi/2019/06/010075701.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2019-07-05 2025-02-24 fdi:010075701 fre