Modifikacija komercijalnih nanofiltracijskih membrana radi poboljšanja njihovih performansi

Vezjak Fluksi, Alegra

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master's thesis

Modifikacija komercijalnih nanofiltracijskih membrana radi poboljšanja njihovih performansi

Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. urn:nbn:hr:149:065399

Vezjak Fluksi, Alegra

University of Zagreb
Faculty of Chemical Engineering and Technology

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APA 6th Edition

Vezjak Fluksi, A. (2024). Modifikacija komercijalnih nanofiltracijskih membrana radi poboljšanja njihovih performansi (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:065399

MLA 8th Edition

Vezjak Fluksi, Alegra. "Modifikacija komercijalnih nanofiltracijskih membrana radi poboljšanja njihovih performansi." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. https://urn.nsk.hr/urn:nbn:hr:149:065399

Chicago 17th Edition

Harvard

Vezjak Fluksi, A. (2024). 'Modifikacija komercijalnih nanofiltracijskih membrana radi poboljšanja njihovih performansi', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 07 February 2025, https://urn.nsk.hr/urn:nbn:hr:149:065399

Vancouver

Vezjak Fluksi A. Modifikacija komercijalnih nanofiltracijskih membrana radi poboljšanja njihovih performansi [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2024 [cited 2025 February 07] Available at: https://urn.nsk.hr/urn:nbn:hr:149:065399

IEEE

A. Vezjak Fluksi, "Modifikacija komercijalnih nanofiltracijskih membrana radi poboljšanja njihovih performansi", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:149:065399

Cite this item: https://urn.nsk.hr/urn:nbn:hr:149:065399

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Title	Modifikacija komercijalnih nanofiltracijskih membrana radi poboljšanja njihovih performansi
Title (english)	Modification of commercial nanofiltration membranes to improve their performances
Author	Alegra Vezjak Fluksi
Mentor	Krešimir Košutić (mentor)
Committee member	Krešimir Košutić (predsjednik povjerenstva)
Committee member	Sandra Babić (član povjerenstva)
Committee member	Aleksandra Sander (član povjerenstva)
Granter	University of Zagreb Faculty of Chemical Engineering and Technology Zagreb
Defense date and country	2024-07-11, Croatia
Scientific / art field, discipline and subdiscipline	TECHNICAL SCIENCES Chemical Engineering
Abstract	Tlačni membranski proces nanofiltracije (NF) koristi se za obradu vode za piće i otpadnih voda. Kako obično ne pokazuju visoke faktore separacije prema nenabijenim molekulama male molekulske mase, cilj ovog istraživanja bio je poboljšati učinkovitost triju komercijalnih NF membrana (NF90, TS80, DK) pri uklanjanju N-nitrozodimetilamina (NDMA) modifikacijom pomoću 4-nitrobenzensulfonil klorida (NBS) kao molekulskog blokatora. Analiziran je sastav struja prije i nakon nanofiltracijske obrade te je praćena permeabilnost vode, odnosno protok permeata. Također su ispitane i promjene površine membrana, tj. njihov aktivni sloj nakon postupka modifikacije. Rezultati pokazuju da je modifikacijom komercijalne DK membrane NBS-om povećan faktor separacije NDMA molekule s 26,0 % na 45,2 % uz zadržavanje 75,93 % početne permeabilnosti čiste vode, što je daleko bolje od preostalih membrana čija se permeabilnost smanjila za 54,84 i 61,29 %. NF90 membrana pokazuje povećanje faktora separacije NDMA molekule s 20,9 na 47,1 %, što je 4,03 % bolje od DK membrane te pokazuje i najviši faktor separacije soli. Ni jedna od ispitivanih membrana nije pokazala dovoljno visok faktor separacije NDMA molekule da bi zadovoljila regulativama zadane granice koncentracija u vodi za piće.
Abstract (english)	Pressure-driven nanofiltration (NF) processes are used in drinking water and wastewater treatment. Since they often don't show high rejection rates of uncharged particles of low molecular weight, the goal of this research was to enhance the N-nitrosodimethylamine (NDMA) rejection efficiency for three commercially available NF membranes (NF90, TS80, DK) via modification using 4-nitrobenzenesulfonyl chloride (NBS) as a molecular plug. Stream compositions were analysed after and prior to the nanofiltration treatment. Water permeability, or rather permeate flow, was measured and changes in the membrane surface, i.e. their active layers post modification were analysed as well. Results show that modifying the commercially available DK membrane increased the rejection rate of NDMA molecule from 20,0 % to 45,2 % while retaining 75,93 % of its original pure water permeability which is miles above the other membranes whose permeability dropped by 54,84 and 61,29 %. The NF90 membrane shows an increase of NDMA molecule rejection rates from 20,9 % to 47,1 % which is 4,03 % higher than the DK membrane, as well as showing the best salt rejection rates. None of the membranes tested here reached NDMA molecule rejection rates high enough to meet the allowed concentrations in drinking water set by regulatory bodies.
Keywords
Keywords (english)
Language	croatian
URN:NBN	urn:nbn:hr:149:065399
Study programme	Title: Chemical Engineering - Graduate study Study programme type: university Study level: graduate Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resource	Text
File origin	Born digital
Access conditions	Open access Embargo expiration date: 2024-09-01
Terms of use
Repository	Repository of Faculty of Chemical Engineering and Technology University of Zagreb
Created on	2024-07-15 13:27:06