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. 2020 Feb 4;7:100045. doi: 10.1016/j.wroa.2020.100045

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© 2020 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 1 — Sampling site. Samples were collected in monthly intervals (untreated and treated samples) by flow proportional sampling, from March 2012 through November 2015. From March 2012 to December 2014, UWW and HWW were treated by separate wastewater treatment plants (WWTPs). During the period from January 2015 through November 2015, UWW was mixed into the HWW (1:2 ratio HWW:UWW) and added to the separate HWW treatment line resulting in mixed WW (MWW). In addition, 12 water samples of the effluent receiving river up (river upstream) and downstream (river downstream sampling point 1 and 2) of the effluent release pipes were collected during the winter months of 2013 (January, February, November, and December).