Abstract
The Tablas de Daimiel National Park (TDNP), a floodplain wetland located in the Upper Guadiana Basin (central Spain), receives pollution from wastewater treatment plants (WWTPs) discharging their treated sewage effluents (TSEs) to tributary channels to the wetland. The TSEs suffer transformations on their way to the TDNP, but the water quality is controlled only at the point of discharge. In this work, we analyse the change in water quality of the TSE from four urban WWTPs in the surroundings of the TDNP (Alcázar de San Juan, Daimiel, Manzanares and Villarrubia de los Ojos towns). The water samples were taken at the outlet of the plants and in the receiving environments, to analyse the water quality transformation of the TSE. The different discharge configurations of each WWTP have been related with the water quality transformation of their TSE, to interpret the influence of the hydro-geomorphology in the improvement or deterioration of the water quality of TSE. We found that the discharge of TSE into slow flow channels with macrophyte vegetation facilitates water self-purification but, with time, the accumulation of sludge in the beds of the effluents tends to be the cause of the deterioration of the water quality.
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Acknowledgments
This work is funded by the European Regional Development Fund (FEDER) through the Regional Government of Castilla-La Mancha (research grant PEIC-2014-001-P). During the experimental period, Sanchez-Ramos held a FPU fellowship for training university professors, funded by the Spanish Ministry of Science and Education. The Guadiana Water Authority promoted the research and provided early financial support for fieldwork, lab analysis and staff. The authors are especially grateful to managers of the Alcázar de San Juan, Daimiel, Manzanares and Villarrubia de los Ojos WWTPs for providing access, databases and other interesting information.
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Sanchez-Ramos, D., Sánchez-Emeterio, G. & Florín Beltrán, M. Changes in water quality of treated sewage effluents by their receiving environments in Tablas de Daimiel National Park, Spain. Environ Sci Pollut Res 23, 6082–6090 (2016). https://doi.org/10.1007/s11356-015-4660-y
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DOI: https://doi.org/10.1007/s11356-015-4660-y