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Micropollutant fluxes in urban environment: a catchment perspective.

Proctor, Kathryn; Petrie, Bruce; Lopardo, Luigi; Muñoz, Dolores Camacho; Rice, Jack; Barden, Ruth; Arnot, Tom; Kasprzyk-Hordern, Barbara

Authors

Kathryn Proctor

Bruce Petrie

Luigi Lopardo

Dolores Camacho Muñoz

Jack Rice

Ruth Barden

Tom Arnot

Barbara Kasprzyk-Hordern



Abstract

This study provided a holistic understanding of the sources, fate and behaviour of 142 compounds of emerging concern (CECs) throughout a river catchment impacted by 5 major urban areas. Of the incoming 169.3kg d-1 of CECs entering the WwTWs, 167.9kg d-1 were present in the liquid phase of influent and 1.4kg d-1 were present in the solid phase (solid particulate matter, SPM). Analysis of SPM was important to determine accurate loads of incoming antidepressants and antifungal compounds, which are primarily found in the solid phase. Furthermore, these classes and the plasticiser, bisphenol A (BPA) were the highest contributors to CEC load in digested solids. Population normalised loads showed little variation across the catchment at 154±12mg d-1 inhabitant-1 indicating that population size is the main driver of CECs in the studied catchment. Across the catchment 154.6kg d-1 were removed from the liquid phase during treatment processes. CECs discharged into surface waters from individual WwTWs contributed between 0.19kg d-1 at WwTW A to 7.3kg d-1 at WwTW E, which correlated strongly with the respective contributing populations. Spatial and temporal variations of individual CECs and their respective classes were found in WwTW influent (both solid (influentSPM) and liquid phases (influentAQ)) throughout the catchment, showing that different urban areas impact the catchment in different ways, with key variables being lifestyle, use of over-the-counter pharmaceuticals and industrial activity. Understanding of both spatial and temporal variation of CECs at the catchment level helped to identify possible instances of direct disposal, as in the case of carbamazepine. Analysis of surface waters throughout the catchment showed increasing mass loads of CECs from upstream of WwTW A to downstream at WwTW D, showing clear individual contributions from WwTWs. Many CECs were ubiquitous throughout the river water in the catchment. Daily loads ranged from 0.005g d-1 (ketamine, WwTW A) up to 1890.3g d-1 (metformin, WwTW C) for the 84/138 CECs that were detected downstream of the WwTWs. For metformin this represents the equivalent of ~1,890 tablets (1,000mg per tablet) dissolved in the river water downstream of WwTW C.

Journal Article Type Article
Journal Journal of hazardous materials
Print ISSN 0304-3894
Publisher Elsevier
Peer Reviewed Peer Reviewed
Article Number 123745
Institution Citation PROCTOR, K., PETRIE, B., LOPARDO, L., MUĂ‘OZ, D.C., RICE, J., BARDEN, R., ARNOT, T. and KASPRZYK-HORDERN, B. [2020]. Micropollutant fluxes in urban environment: a catchment perspective. Journal of hazardous materials [online], In Press. Available from: https://doi.org/10.1016/j.jhazmat.2020.123745
DOI https://doi.org/10.1016/j.jhazmat.2020.123745
Keywords Pharmaceuticals; Pesticides; Endocrine disruptors; River; Wastewater; Solids; Personal care products; Chemicals of emerging concern
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