Innovative Ceramic Membranes for Sweeping Gas Membrane Distillation: Membrane Characterization and Process Development

Fawzy, Mohamed Khaled Adel (2020) Innovative Ceramic Membranes for Sweeping Gas Membrane Distillation: Membrane Characterization and Process Development, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Ingegneria civile, chimica, ambientale e dei materiali, 32 Ciclo.
Documenti full-text disponibili:
[img] Documento PDF (English) - Accesso riservato fino a 24 Marzo 2022 - Richiede un lettore di PDF come Xpdf o Adobe Acrobat Reader
Disponibile con Licenza: Salvo eventuali più ampie autorizzazioni dell'autore, la tesi può essere liberamente consultata e può essere effettuato il salvataggio e la stampa di una copia per fini strettamente personali di studio, di ricerca e di insegnamento, con espresso divieto di qualunque utilizzo direttamente o indirettamente commerciale. Ogni altro diritto sul materiale è riservato.
Download (8MB) | Contatta l'autore

Abstract

The employment of tubular hydrophobic carbon-based titania membranes in sweeping gas membrane distillation (SGMD) was studied in this PhD thesis. The characterization of some of the membrane morphological properties was implemented by experimental and modeled results of gas permeation tests. The dusty gas model was adopted in gas permeation modeling. Two different approaches were followed during modeling. The first approach considered the morphological properties of each single membrane layer. As for the second approach, average membrane morphological properties were characterized without considering the unique contribution of each layer. The investigation of the module performance during SGMD operations was achieved by experimental and modeling studies for NaCl (aq.). The model considered the Knudsen and molecular diffusion mechanisms. The module was capable of undergoing experiments at temperatures up to 110°C. Experimental flux results went in agreement with the modeled values obtained on using the morphological properties of each membrane layer. On the contrary, the modeled values obtained on considering average membrane morphological properties deviated significantly from the experimental results. The model was also used to estimate the effect of the operating conditions and flow configuration on water flux. Other modeling studies of the modules were performed for ethanol (aq.) to predict the effect of the operating conditions on the membrane selectivity. The Maxwell-Stefan approach was followed in this case. Eventually, a hypothetical sweater desalination process was proposed incorporating SGMD (using the modules studied in this thesis) as the desalination unit. Process development and optimization were carried out. The optimized case corresponded to SGMD liquid inlet temperature of 107°C for an SGMD vessel having a length of 5.4 m. This corresponded to a water production cost of 20.9 $/m3 such that the feed heating was the determinant cost item. This cost could be mitigated in case of using a waste heat source.

Abstract
Tipologia del documento
Tesi di dottorato
Autore
Fawzy, Mohamed Khaled Adel
Supervisore
Co-supervisore
Dottorato di ricerca
Ciclo
32
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
Membrane Distillation, Sweeping Gas Membrane Distillation, Ceramic Membranes, Desalination, Morphological Characterization, Membrane Distillation Modeling, Process Development, Process Optimization, Dusty Gas Model, Maxwell-Stefan
URN:NBN
Data di discussione
24 Marzo 2020
URI

Altri metadati

Gestione del documento: Visualizza la tesi

^