Washing Posidonia oceanica with treated urban wastewater for biofilter and agricultural use
2025
Ramos-Esplá, Alfonso A. | Jordá Guijarro, Juana Dolores | Valdes-Abellan, Javier | Garmendia, Idoia | Barba, Eugenio | Fullana, Andres | Fullana, Andres | Garmendia, Idoia | Jordá Guijarro, Juana Dolores | Ramos-Esplá, Alfonso A. | Valdes-Abellan, Javier | Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada | Universidad de Alicante. Departamento de Bioquímica y Biología Molecular y Edafología y Química Agrícola | Universidad de Alicante. Departamento de Ingeniería Civil | Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente | Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario del Agua y las Ciencias Ambientales | Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio "Ramón Margalef" | Biología Marina | Química Agrícola | Ingeniería Hidráulica y Ambiental (INGHA) | Fisiología Vegetal Aplicada | Ingeniería para la Economía Circular (I4CE)
Posidonia oceanica is an important higher plant in shallow waters of the Mediterranean coast. It plays a crucial role not only in marine ecosystems but also in protecting shores from surf impact thanks to the deposition of important volumes of leaves and wave damping. However, these deposits interact with touristic activities and they are removed from the beaches producing important management problems. Many different uses have been proposed to take advantage of this material, but the high salt and sometimes, heavy metal content hinder its applicability. The aim of this study is to evaluate the potential use of treated wastewater to wash the posidonia remains to transform the remains into valuable resources, which, in this way, could also act as a biofilter in supplementary water treatments. We proposed a set of 6 alternatives combining factors such as flooding/natural leachate, natural/forced airing bed or frequency in water application: once-daily percolated washing with natural convection; multiple-daily percolated wash with natural convection, once-daily percolated wash with forced convection, multiple-daily percolated wash with forced convection, once-daily flood wash with emptying weekly and once-daily flood wash with overflow. Our results show that less than 8 days are required to remove the initial salt content for all 6 treatments, although once-daily flood wash with emptying weekly treatment was the one that caused less Pb and Zn retention on posidonia residues and more P accumulation, which makes it more interesting for agricultural use. Regarding the ability of Posidonia for water treatment, suspended solids do not show a clear reduction for any treatment, and even small increases were produced. In addition, anaerobic processes increased COD and BOD5. These results suggest that more research is needed prior to use posidonia residues as a biofilter.
اظهر المزيد [+] اقل [-]This project was financed by the Alicante Provincial Council cod. DIPUTACION6-17TPA.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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