accedaCRIShttps://accedacris.ulpgc.es/jspuiThe accedaCRIS digital repository system captures, stores, indexes, preserves, and distributes digital research material.Thu, 12 Sep 2024 22:53:20 GMT2024-09-12T22:53:20Z5031Fouling control and modeling in reverse osmosis for seawater desalination: A reviewhttp://hdl.handle.net/10553/114786Title: Fouling control and modeling in reverse osmosis for seawater desalination: A review
Authors: Najid, Noura; Hakizimana, Jean Nepo; Kouzbour, Sanaa; Gourich, Bouchaib; Ruiz-García, Alejandro; Vial, Christophe; Stiriba, Youssef; Semiat, Raphael
Abstract: The development of the antifouling Reverse Osmosis (RO) membranes requires modeling and simulation as an essential tool alongside the progress of RO membrane technologies. After discussing the most recent knowledge on fouling, cleaning procedures, and pretreatment technologies, this review highlights the recent advances in RO membranes technology, together with macroscale and microscale modeling that could lead the full development of antifouling RO membrane. Computational Fluid Dynamics (CFD) emerges as a promising modeling tool that could fully capture all mechanisms/phenomena involved in RO and fouling. For the successful simulation of fouling coupled to RO process, the development of models achieving a trade-off between computational cost and accuracy requirements that can be applied to all fouling types requires further theoretical development in the future.
Sat, 01 Jan 2022 00:00:00 GMThttp://hdl.handle.net/10553/1147862022-01-01T00:00:00ZPerformance evaluation and boron rejection in a SWRO system under variable operating conditionshttp://hdl.handle.net/10553/111129Title: Performance evaluation and boron rejection in a SWRO system under variable operating conditions
Authors: Ruiz García, Alejandro; De La Nuez Pestana, Ignacio Agustín
Abstract: It is well known that reverse osmosis (RO) is the leading desalination technology. As an energy intensive technology, the exploitation of renewable energy sources (RES) to power RO systems is a attractive option. A strategy to take advantage of all the available energy of an off-grid renewable system is to work with the RO system under variable operating conditions. This implies additional challenges in terms of water production and permeate quality, among others. Boron rejection is one of the main concerns in seawater RO (SWRO) systems. The aim of this work was to evaluate the performance and boron rejection of a single-stage SWRO system with 7 membrane elements per pressure vessel under variable operating conditions. The initial permeability coefficients of two SWRO membranes (TM820L-440 and TM820S-400) were calculated from experimental data of a full-scale SWRO desalination plant. These coefficients and the characteristics of the membranes were introduced in a simulation algorithm to estimate the behavior of the SWRO system. The results show that, compared with the TM820S-400 membrane, the TM820L-440 performed better in terms of boron rejection in the form of boric acid, but worse in terms of water production. When RES-powered SWRO systems are designed to work under variable operating conditions, consideration needs to be given to the safe operation window in terms of boron concentration in the permeate and to variation of the permeability coefficient of the membranes.
Fri, 01 Jan 2021 00:00:00 GMThttp://hdl.handle.net/10553/1111292021-01-01T00:00:00ZNew computational tool to evaluate experimental VLE and VLLE data of multicomponent systemshttp://hdl.handle.net/10553/35371Title: New computational tool to evaluate experimental VLE and VLLE data of multicomponent systems
Authors: Ortega, J.; Wisniak, Jaime; Fernández, Luis
Abstract: This work presents a rigorous method to analyze the thermodynamic
consistency of VLE and VLLE data of multicomponent systems, as an
extension of a method previously proposed for binary solutions. The
method or proposed test verifies the coherence between the Gibbs-Duhem
equation and experimental data, using the same number of equations as
degrees of freedom of the system. Resolution is achieved by means of two
methods called the integral-form and differential-form, and for each of
these, characteristic parameters that qualify the quality of the data
are generated. The integration of the equation above mentioned between
data pairs generates the residuals delta psi and constitutes the
integral-form. This form verifies the consistency when the value of
these residuals is lower than the maximum value, calculated as
epsilon(m)(psi) = k(psi) epsilon(M,0)(psi) , where epsilon(M,0)(psi) is
the error associated with psi at each point and k(psi) = 5; it should
occurs that epsilon(m)(psi) < = 4. In the application of the
differential-form each partial derivative of psi is verified and can be
used to verify the coherence between the compositions of each component
in all the phases by the residual delta zeta i. The maximum values of
these residuals are established by epsilon(m)(zeta i) = k(zeta
i)epsilon(M,0)(zeta i) where epsilon(M,0)(zeta i) is the maximum
permissible error and k(zeta i) = 5, it should occurs that
epsilon(m)(zeta i) < = vertical bar 0.1{[}max(zeta i)-min(zeta
i)]vertical bar. The limits of the parameters for the proposed test are
established after applying the method to several systems generated
artificially. The test was applied to a set of real systems, 50
ternaries and 2 quaternaries, verifying the degree of
consistency/inconsistency according to the parameters defined. The
behavior of the test is compared with that of Wisniak-Tamir in
multicomponent systems. In summary, the proposed test is shown to be a
useful tool to assess the quality of VLE and VLLE data of multicomponent
systems.
Sun, 01 Jan 2017 00:00:00 GMThttp://hdl.handle.net/10553/353712017-01-01T00:00:00Z