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Open AccessArticle

Toxicity Abatement of Wastewaters from Tourism Units by Constructed Wetlands

1
Interdisciplinary Centre of Marine and Environmental Research (CIIMAR/CIMAR), University of Porto, Novo Edifício do Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal
2
Universidade Católica Portuguesa, CBQF–Centro de Biotecnologia e Química Fina-Laboratório Associado, Escola Superior de Biotecnologia, Rua Diogo Botelho 1327, 4169-005 Porto, Portugal
3
GreenUPorto-Sustainable Agrifood Production Research Centre & Department of Biology, Faculty of Sciences of the University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
*
Author to whom correspondence should be addressed.
Water 2019, 11(12), 2623; https://doi.org/10.3390/w11122623
Received: 31 October 2019 / Revised: 4 December 2019 / Accepted: 9 December 2019 / Published: 12 December 2019
(This article belongs to the Special Issue Recent Progress of Constructed Wetland for Wastewater Treatment)
The present research intended to investigate the toxicity abatement of domestic wastewater after passing a biosystem composed of a constructed wetland (CW) followed by a pond. The wastewater was generated in a tourism house in a rural and mountainous context and passed through a septic tank before being diverted to a CW followed by a pond. A battery of ecotoxicological tests, comprising microalgae (Raphidocelis subcapitata), macrophytes (Lemna minor), cladocerans (Daphnia magna), and bacteria (Aliivibrio fischeri), was used to assess the toxicity of the wastewater collected before and after the CW and the water of the pond. Physicochemical parameters (pH, conductivity, chemical oxygen demand, biochemical oxygen demand, total suspended solids, phosphates, ammonium, and nitrate) were also determined. The CW was able to remove carbon and nutrients from the water with a concomitant reduction of its toxicity. This study, reinforced the added value of using toxicity tests as a complement to CW operational monitoring to validate the solution and to analyze possible readjustments that may be required to improve efficiency. This study lends further support to the claim that CWs can be a sustainable solution for treating small volumes of domestic wastewater in a rural context. View Full-Text
Keywords: tourism; wastewater treatment; constructed wetland; phytoremediation; toxicity; Aliivibrio fischeri; Raphidocelis subcapitata; Daphnia magna; Lemna minor tourism; wastewater treatment; constructed wetland; phytoremediation; toxicity; Aliivibrio fischeri; Raphidocelis subcapitata; Daphnia magna; Lemna minor
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MDPI and ACS Style

Calheiros, C.S.C.; Castro, P.M.L.; Gavina, A.; Pereira, R. Toxicity Abatement of Wastewaters from Tourism Units by Constructed Wetlands. Water 2019, 11, 2623.

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