Packed-bed biofilm photobioreactor combined with ultrafiltration membrane was investigated for intensifying the process for secondary wastewater effluent treatment. Cylindrical glass carriers were used as supporting material for the microalgal-bacterial biofilm, which developed from indigenous microbial consortium. Glass carriers allowed adequate growth of the biofilm with limited suspended biomass. Stable operation was achieved after a start-up period of 1000 h, where supernatant biopolymer clusters were minimized and complete nitrification was observed. After that time, biomass productivity was 54 ± 18 mg·L−1·day−1. Green microalgae Tetradesmus obliquus and several strains of heterotrophic nitrification–aerobic denitrification bacteria and fungi were identified. Combined process exhibited COD, nitrogen and phosphorus removal rates of 56 ± 5%, 12 ± 2% and 20 ± 6%, respectively. Membrane fouling was mainly caused by biofilm formation, which was not effectively mitigated by air-scouring aided backwashing.
CITATION STYLE
Díaz, O., González, E., Vera, L., Fernández, L. J., Díaz-Marrero, A. R., & Fernández, J. J. (2023). Recirculating packed-bed biofilm photobioreactor combined with membrane ultrafiltration as advanced wastewater treatment. Environmental Science and Pollution Research, 30(27), 69977–69990. https://doi.org/10.1007/s11356-023-27309-2
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