The article is entitled "Treating municipal wastewater through a vegetation filter with a short-rotation poplar species".
You can now see the article written by various members of IMDEA Water, Universidad Rey Juan Carlos, CENTA Foundation and University of Alcalá, which has been published in Volume No. 73 of the journal "Ecological Engineering". The reference in the article is as follows:
De Miguel, Á. and Meffe, R. and Leal, M. and González-Naranjo, V. and Martínez-Hernández, V. and Lillo, J. and Salas, J.J. and Martín, I. and De Bustamante, I. (2014) Treating municipal wastewater through a vegetation filter with a short-rotation poplar species. Ecological Engineering, 73. pp. 560-568.
Until 29 November, you have free access to the full version of the article.