Blokiranje nanofiltracijskih membrana - testiranje modela

master's thesis

• Title (english): Fouling of nanofiltration membranes - model testing
• Author: Jelena Šetinc
• Mentor: Krešimir Košutić (mentor)
• Committee member: Krešimir Košutić (predsjednik povjerenstva)
• Committee member: Davor Dolar (član povjerenstva)
• Committee member: Danijela Ašperger (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2017-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Environmental Protection in Chemical Engineering

Abstract

Nanofiltracija (NF) je separacijski proces koji ima široku primjenu u industriji. Međutim, blokiranje membrana jedan je od najvećih izazova njene primjene. Ne uzme li se u obzir i ne ispita li se prije primjene, dovodi do neočekivanih povećanih troškova i smanjene kvalitete permeata. Prema tome, dobar opis samog formiranja/procesa blokiranja omogućio bi bolju procjenu očekivanih svojstava membrane pa time i samih procesnih troškova. U ovom je radu ispitivana primjenjivost Hermijinih modela i modela modificiranih za ukriženo strujanje za opis mehanizama blokiranja NF membrana pri NF vodenih otopina polietilen glikola (PEG) molekulskih masa 300 g mol^-1, 600 g mol^-1, 1 500 g mol^-1, 4 000 g mol^-1 i 35 000 g mol^-1 različitih koncentracija pri radnim tlakovima od 5, 10 i 15 bar. Modeli potpunog i umjerenog blokiranja pora najbolje su opisali dobivene rezultate svih provedenih eksperimenata. Model blokiranja uslijed formiranja kolača dobro opisuje rezultate dobivene u kasnijoj fazi provođenja eksperimenata. To upućuje na pojavu više mehanizama blokiranja u tijeku procesa. Općenito, modeli modificirani za ukriženi tok pokazali su se boljima za opis ispitanih sustava.

Abstract (english)

Nanofiltration (NF) is a separation process with numerous industrial applications. Membrane fouling is the major drawback that challenges the wider application of NF. It leads to an unexpected increase of expenses and lower quality of permeate, if not properly examined and considered during the design/before application. Thus, a better mathematical description of fouling mechanisms can lead to better prediction of membrane properties and expenses during the application. In this work Hermia´s and modified cross-flow models were used to investigate the fouling mechanisms involved in the NF of polyethylene glycol (PEG). Experiments were performed with various concentrations of PEG (300 g mol^-1, 600 g mol^-1, 1 500 g mol^-1, 4 000 g mol^-1, and 35 000 g mol^-1) at working pressures of 5, 10, and 15 bar. The best fit to experimental data for all the experimental conditions tested corresponded to the complete and partial pore blocking models. While in the later stage of the experiments, the cake layer formation (cake filtration) model showed a better agreement with experimental data. This indicates that multiple fouling mechanisms could occur during nanofiltration of PEG. In general, cross-flow models were superior to Hermia’s models for describing the system.

• Keywords: nanofiltracija; blokiranje membrana; modeli blokiranja; ukriženi tok; Hermia modeli
• Keywords (english): nanofiltration; membrane fouling; modelling of flux decline; cross-flow; Hermia models
• Language: croatian
• URN:NBN: urn:nbn:hr:149:277311
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-04-27 13:06:11