This is the author´s accepted manuscript which includes all revisions from the peer review process. Subscribers to the journal can access the final published version at https://doi.org/10.1016/j.jenvman.2020.111538 Received Date: 30 March 2020 Revised Date: 16 October 2020 Accepted Date: 18 October 2020 Available online: 25 October 2020 Published Date: 15 January 2021 Please cite this article as: Pous, N., Barcelona, A., Sbardella, L., Hidalgo, M., Colomer, J., Serra, T. and Salvadó, V. (2021) Zooplankton-based reactors for tertiary 9 wastewater treatment: a pilot-scale case study.. Journal of Environmental Management., vol. 278, part 1, art. núm. 111538. Avalilable on line at https://doi.org/10.1016/j.jenvman.2020.111538 © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0