Grupos Investigadores

Miembros del Grupo

Investigadores
Beñat
Elduayen Echave
Colaboradores
Andreu
Dalmau Martínez

Líneas de Investigación

  • Soluciones basadas en procesos químicos y físico-químicos en el tratamiento de aguas y residuos sólidos
  • Modelado matemático y simulación de sistemas de gestión y tratamiento del agua
  • Diseño y operación de tecnologías de tratamiento de aguas

Palabras Clave

  • Tratamiento y gestión de agua y residuos
  • Modelado matemático y simulación

Publicaciones Científicas desde 2018

  • Autores: Lizarralde Aguirrezabal, Izaro (Autor de correspondencia); Guida, S.; Canellas, J.; et al.
    Revista: WATER RESEARCH
    ISSN 0043-1354 Vol.206 2021 págs. 117779
    Resumen
    Ammonia ion removal and recovery via an ion-exchange process using zeolites is a promising alternative to traditional biological treatments. The analysis of its efficiency is not straightforward as it depends on various factors, such as the cation exchange capacity of the zeolite, amount of zeolite available, initial ammonia concentration, contact time, ammonia speciation depending on pH or the presence of competing ions. Mathematical modelling and simulation tools are very useful to analyse the effect of different operational conditions on the efficiency and optimal operation of the process. This paper experimentally analyses the effect that the presence of competing ions has on the efficiency of ammonia removal. This experimental work has shown a reduction of around 21% of ammonia removal efficiency in the presence of competing ions. The main contribution of this paper is the development new mathematical model able to describe the ion-exchange process in the presence of competing ions. The mathematical model developed is able to analyse the performance of the IEX process under different empty bed contact times, influent loads, pH and concentrations of competing ions. The capability of the model to reproduce real data has been proven comparing the experimental and simulation results. Finally, an exploration by simulation has been undertaken to show the potential of the mathematical model developed.
  • Autores: Elduayen Echave, Beñat (Autor de correspondencia); Lizarralde Aguirrezabal, Izaro; Schneider, P.; et al.
    Revista: WATER RESEARCH
    ISSN 0043-1354 Vol.200 2021 págs. 117242
    Resumen
    The effect of mixing in the modelling of processes based on mass transfer phenomena is commonly ignored in wastewater treatment industry. In this contribution, the effect of the average shear rate in the nucleation and growth rates of struvite is analyzed by combining experimental data with simulation results obtained with a previously presented mass-based discretized population balance model. According to the obtained results, the effect of the average shear rate is identifiable for the selected data and mechanisms. Therefore, it should be considered when a detailed modelling of the process is needed. Consequently, in this contribution, the average shear rate has been decoupled from the kinetic constants. In addition, kinetic rates where it is explicitly included as a power law function have been proposed. The exponents in these power law functions for the primary homogeneous nucleation and growth are 1.3 and 0.3, respectively. Considering shear rate effects allowed to see in the simulation outputs experimentally observed effects: a faster pH decay and smaller particle distribution for increasing mixing intensities. (c) 2021 Elsevier Ltd. All rights reserved.
  • Autores: Elduayen Echave, Beñat (Autor de correspondencia); Azcona Calero, Mikel; Grau Gumbau, Paloma; et al.
    Revista: JOURNAL OF WATER PROCESS ENGINEERING
    ISSN 2214-7144 Vol.38 2020 págs. 101657
    Resumen
    Controlled struvite precipitation is a promising solution for phosphorus recovery in wastewater treatment plants. Particle size distribution of recovered struvite affects its efficacy as a fertilizer, so should be considered in the design and operation of struvite recovery reactors. This contribution analyzes the effect of varying the average shear rate (between 150 s(-1) and 876 s(-1)) and saturation index (between 0.76 and 2.96) in two different experimental set-ups. Solution pH and particle number and size measurements using an electric zone sensing method are used to monitor the process. In addition, photomicrographs are used to observe the shape of the precipitated particles. Interestingly, for identical thermochemical conditions, a higher mixing intensity, associated with the shear rate, leads to shorter induction times, faster precipitation and a greater particle density. On the other hand, for similar mixing conditions, a higher saturation index is also linked with shorter induction times, faster precipitation and a greater particle density. From the experimental data it is concluded that the effect of the fluid shear rate cannot be ignored and should be further studied in the precipitation process.

Proyectos desde 2018

  • Título: Modelado matemático y simulación de nuevos procesos y soluciones para la recuperación de fósforo de estaciones depuradoras de aguas residuales
    Código de expediente: PIBA_2022_1_0022
    Investigador principal: PALOMA GRAU GUMBAU, PALOMA GRAU GUMBAU.
    Financiador: GOBIERNO VASCO
    Convocatoria: PROYECTOS DE INVESTIGACIÓN BÁSICA Y APLICADA 2022-2024
    Fecha de inicio: 11-08-2022
    Fecha fin: 30-06-2025
    Importe concedido: 50.000,00 €
    Fondos FEDER: NO
  • Título: Modelado matemático y simulación de nuevos procesos y soluciones para la recuperación de fósforo de estaciones depuradoras de aguas residuales
    Código de expediente: PID2019-108378RB-I00
    Investigador principal: PALOMA GRAU GUMBAU.
    Financiador: MINISTERIO DE CIENCIA E INNOVACIÓN
    Convocatoria: 2019 AEI PROYECTOS I+D+i (incluye Generación del conocimiento y Retos investigación)
    Fecha de inicio: 01-06-2020
    Fecha fin: 31-05-2023
    Importe concedido: 102.850,00 €
    Fondos FEDER: NO