ESTUDIO DE LOS PROCESOS DE ATENUACION DE METALES Y COMPUESTOS INORGANICOS EN AGUAS SUBTERRANEAS MEDIANTE NANOPARTICULAS MINERALES
CGL2014-57215-C4-4-R
•
Nombre agencia financiadora Ministerio de Economía y Competitividad
Acrónimo agencia financiadora MINECO
Programa Programa Estatal de I+D+I Orientada a los Retos de la Sociedad
Subprograma Todos los retos
Convocatoria Retos Investigación: Proyectos de I+D+I (2014)
Año convocatoria 2014
Unidad de gestión Dirección General de Investigación Científica y Técnica
Centro beneficiario UNIVERSITAT POLITÉCNICA DE CATALUNYA (UPC) / UNIVERSIDAD POLITÉCNICA DE CATALUÑA (UPC)
Centro realización DEPARTAMENTO INGENIERÍA QUÍMICA
Identificador persistente http://dx.doi.org/10.13039/501100003329
Publicaciones
Found(s) 1 result(s)
Found(s) 1 page(s)
Found(s) 1 page(s)
Feasibility of using rural waste products to increase the denitrification efficiency in a surface flow constructed wetland
Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
- Margalef Marti, Rosanna
- Carrey, Raúl
- Merchán Elena, Daniel
- Soler, Albert
- Causapé, Jesús
- Otero, Neus
A surface flow constructed wetland (CW) was set in the Lerma gully to decrease nitrate (NO3-) pollution from agricultural runoff water. The water flow rate and NO3
- concentration were monitored at the inlet and the outlet, and sampling campaigns were performed which consisted of collecting six water samples along the CW flow line. After two years of operation, the NO3 -attenuation was limited at a flow rate of ~2.5 L/s and became negligible at ~5.5 L/s. The present work aimed to assess the feasibility of using rural waste products (wheat hay, corn stubble, and animal compost) to induce denitrification in the CW, to assess the effect of temperature on this process, and to trace the efficiency of the treatment by using isotopic tools. In the first stage, microcosm experiments were performed. Afterwards, the selected waste material was applied in
the CW, and the treatment efficiency was evaluated by means of a chemical and isotopic characterization and using the isotopic fractionation (ε) values calculated from laboratory experiments to avoid field-scale interference. The microcosms results showed that the stubble was the most appropriate material for application in the CW, but the denitrification rate was found to decrease with temperature. In the CW, biostimulation in autumn-winter promoted NO3-attenuation between two weeks and one month (a reduction in NO3- between 1.2 and 1.5 mM was achieved). After the biostimulation in spring-summer, the attenuation was maintained for approximately three months (NO3 - reduction between 0.1 and 1.5 mM). The ε15NNO3/N2 and ε18ONO3/N2 values obtained from the laboratory experiments allowed to estimate the induced
denitrification percentage. At an approximate average flow rate of 16 L/s, at least 60 % of NO3 -attenuation was achieved in the CW. The field samples exhibited a slope of 1.0 for δ18O-NO3 -versus δ15N-NO3 -, similar to those of the laboratory experiments (0.9-1.2). Plant uptake seemed to play a minor role in NO3 - attenuation in the CW. Hence, the application of stubble in the CW allowed the removal of large amounts of NO3 - from the Lerma gully, especially when applied during the warm months, but its efficacy was limited to a short time period (up to three months)., This work was financed by the projects REMEDIATION (CGL2014-57215-C4), AGRO-SOS (CGL2015-66016-R) and PACE-ISOTEC (CGL2017-87216-C4-1-R) financed by the Spanish Government and AEI/FEDER financed by the European Union, and by MAG (2017 SGR 1733) financed by the Catalan Government. R. Margalef-Marti thanks the Spanish Government for the Ph.D. grant BES-2015-072882. D. Merchán was supported by the “Juan de la Cierva – Formación” program (FJCI-2018-24920).
- concentration were monitored at the inlet and the outlet, and sampling campaigns were performed which consisted of collecting six water samples along the CW flow line. After two years of operation, the NO3 -attenuation was limited at a flow rate of ~2.5 L/s and became negligible at ~5.5 L/s. The present work aimed to assess the feasibility of using rural waste products (wheat hay, corn stubble, and animal compost) to induce denitrification in the CW, to assess the effect of temperature on this process, and to trace the efficiency of the treatment by using isotopic tools. In the first stage, microcosm experiments were performed. Afterwards, the selected waste material was applied in
the CW, and the treatment efficiency was evaluated by means of a chemical and isotopic characterization and using the isotopic fractionation (ε) values calculated from laboratory experiments to avoid field-scale interference. The microcosms results showed that the stubble was the most appropriate material for application in the CW, but the denitrification rate was found to decrease with temperature. In the CW, biostimulation in autumn-winter promoted NO3-attenuation between two weeks and one month (a reduction in NO3- between 1.2 and 1.5 mM was achieved). After the biostimulation in spring-summer, the attenuation was maintained for approximately three months (NO3 - reduction between 0.1 and 1.5 mM). The ε15NNO3/N2 and ε18ONO3/N2 values obtained from the laboratory experiments allowed to estimate the induced
denitrification percentage. At an approximate average flow rate of 16 L/s, at least 60 % of NO3 -attenuation was achieved in the CW. The field samples exhibited a slope of 1.0 for δ18O-NO3 -versus δ15N-NO3 -, similar to those of the laboratory experiments (0.9-1.2). Plant uptake seemed to play a minor role in NO3 - attenuation in the CW. Hence, the application of stubble in the CW allowed the removal of large amounts of NO3 - from the Lerma gully, especially when applied during the warm months, but its efficacy was limited to a short time period (up to three months)., This work was financed by the projects REMEDIATION (CGL2014-57215-C4), AGRO-SOS (CGL2015-66016-R) and PACE-ISOTEC (CGL2017-87216-C4-1-R) financed by the Spanish Government and AEI/FEDER financed by the European Union, and by MAG (2017 SGR 1733) financed by the Catalan Government. R. Margalef-Marti thanks the Spanish Government for the Ph.D. grant BES-2015-072882. D. Merchán was supported by the “Juan de la Cierva – Formación” program (FJCI-2018-24920).