Ispitivanje mehanizma prijenosa tvari i utjecaja aksijalne disperzije na vezanje Cd(II) i Zn(II) iz binarne vodene otopine na nepomičnom sloju prirodnog zeolita : diplomski rad

Sabljo, Kristina

master's thesis

Investigation of the mass transfer mechanism and impact of axial dispersion on the removal of Cd(II) and Zn(II) from binary aqueous solution onto fixed bed of natural zeolite

diploma thesis

Kristina Sabljo (2017)

University of Split
Faculty of Chemistry and Technology
Library

Cite this document

APA 6th Edition

Sabljo, K. (2017). Ispitivanje mehanizma prijenosa tvari i utjecaja aksijalne disperzije na vezanje Cd(II) i Zn(II) iz binarne vodene otopine na nepomičnom sloju prirodnog zeolita : diplomski rad (Master's thesis). Retrieved from https://urn.nsk.hr/urn:nbn:hr:167:348847

MLA 8th Edition

Sabljo, Kristina. "Ispitivanje mehanizma prijenosa tvari i utjecaja aksijalne disperzije na vezanje Cd(II) i Zn(II) iz binarne vodene otopine na nepomičnom sloju prirodnog zeolita : diplomski rad." Master's thesis, University of Split, Faculty of Chemistry and Technology, Library, 2017. https://urn.nsk.hr/urn:nbn:hr:167:348847

Chicago 17th Edition

Harvard

Sabljo, K. (2017). 'Ispitivanje mehanizma prijenosa tvari i utjecaja aksijalne disperzije na vezanje Cd(II) i Zn(II) iz binarne vodene otopine na nepomičnom sloju prirodnog zeolita : diplomski rad', Master's thesis, University of Split, Faculty of Chemistry and Technology, Library, accessed 22 November 2019, https://urn.nsk.hr/urn:nbn:hr:167:348847

Vancouver

Sabljo K. Ispitivanje mehanizma prijenosa tvari i utjecaja aksijalne disperzije na vezanje Cd(II) i Zn(II) iz binarne vodene otopine na nepomičnom sloju prirodnog zeolita : diplomski rad [Master's thesis]. Split: University of Split, Faculty of Chemistry and Technology, Library; 2017 [cited 2019 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:167:348847

IEEE

K. Sabljo, "Ispitivanje mehanizma prijenosa tvari i utjecaja aksijalne disperzije na vezanje Cd(II) i Zn(II) iz binarne vodene otopine na nepomičnom sloju prirodnog zeolita : diplomski rad", Master's thesis, University of Split, Faculty of Chemistry and Technology, Library, Split, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:167:348847

Cite this item: https://urn.nsk.hr/urn:nbn:hr:167:348847

Metadata

Title	Ispitivanje mehanizma prijenosa tvari i utjecaja aksijalne disperzije na vezanje Cd(II) i Zn(II) iz binarne vodene otopine na nepomičnom sloju prirodnog zeolita : diplomski rad
Title (english)	Investigation of the mass transfer mechanism and impact of axial dispersion on the removal of Cd(II) and Zn(II) from binary aqueous solution onto fixed bed of natural zeolite : diploma thesis
Author	Kristina Sabljo
Mentor	Ivona Nuić (mentor)
Committee member	Marija Ćosić (predsjednik povjerenstva)
Committee member	Marin Ugrina (član povjerenstva)
Committee member	Ivona Nuić (član povjerenstva)
Granter	University of Split Faculty of Chemistry and Technology Library Split
Defense date and country	2017-10-31, Croatia
Scientific / art field, discipline and subdiscipline	TECHNICAL SCIENCES Chemical Engineering
Abstract	Ispitan je proces uklanjanja kadmija i cinka postupkom u koloni iz binarne ekvimolarne vodene otopine ukupne početne koncentracije c o (Cd+Zn) ≈ 1 mmol/L pri protocima od Q = 1, 2 i 3 mL/min. Provedena su tri radna ciklusa i tri ciklusa regeneracije na istom uzorku zeolita visine sloja od 8 cm. Iz eksperimentalnih rezultata nacrtane su krivulje proboja i krivulje regeneracije, izračunati su karakteristični parametri te je utvrđena učinkovitost procesa. Povećanjem protoka otopine proboj i iscrpljenje se pojavljuju ranije, smanjuje se kapacitet zeolita i efikasnost kolone. Prirast ukupne količine (Cd+Zn) iona vezanih na zeolitu linearno raste od početka eksperimenta nakon čega se počinje smanjivati (točka infleksije) što ukazuje na promjenu mehanizma koji kontrolira ukupnu brzinu procesa. Primjenom Advekcijsko-disperzijsko-reakcijskog modela (ADR) izračunat je koeficijent aksijalne disperzije, D L , pomoću kojega je izračunat koeficijent prijenosa tvari, k f kroz difuzijski granični sloj čestice zeolita. Utvrđeno je da je utjecaj aksijalne disperzije izraženiji za veće protoke otopine kroz sloj jer otopina zaobilazi dio čestica u zeolitnom sloju zbog nedovoljnog kontakta između otopine i zeolita. Najveća vrijednost k f utvrđena je u točki proboja, a zatim opada prema točki iscrpljenja uslijed povećanja debljine difuzijskog graničnog sloja. Do područja infleksije brzinu procesa kontrolira prijenos tvari konvekcijom u tekućoj fazi, a nakon infleksije prijenos tvari difuzijom kroz česticu. Povećanjem protoka može se obraditi veći volumen otopine u kraćem vremenu, međutim protok postaje ograničavajući faktor jer uslijed njegova povećanja dolazi do pojave aksijalne disperzije koja dovodi do smanjenja efikasnosti kolone.
Abstract (english)	Removal of cadmium and zinc from equimolar binary aqueous solution of total initial concentration of c o (Cd+Zn) ≈ 1 mmol/L has been investigated using the column process at the flow rates of Q = 1, 2 and 3 mL/min. Three service and three regeneration cycles were performed on the same zeolite bed with height of 8 cm. The experimental results are shown by breakthrough and regeneration curves, and the characteristic parameters have been calculated as well as removal efficiency. By increasing in flow rate, the breakthrough and exhaustion points occured earlier, while zeolite capacity and column efficiency decreased. The quantity of (Cd+Zn) ions increases linearly from the beginning of the experiment, after that decrease (inflection point) indicating a change in mechanism which controls the overall process rate. The Advection-Dispersion-Reaction (ADR) model was applied for calculation of the axial dispersion coefficient, D L from which the mass transfer coefficient, k f , through the diffusion boundary layer has been calculated. The impact of axial dispersion is more pronounced for higher flow rates because of the solution bypassing some of the zeolite particles due to insufficient contact between the solution and the zeolite layer. The highest value of k f is observed in the breakthrough point, and then decreases to the exhaustion point due to increase in thickness of diffusion boundary layer. Up to inflection, the mass transfer by convection through the liquid phase controls the overall procces rate, and after that the mass transfer by diffusion through the boundary layer of the zeolite particle. By increasing in flow rate a larger volume of the solution can be treated in a shorter time, but the flow of the solution becomes a limiting factor because with its increase, an axial dispersion occurs which consequently results in a reduction of column efficiency.
Keywords
Keywords (english)
Language	croatian
URN:NBN	urn:nbn:hr:167:348847
Project	Number: IP-2013-11-4981 Title: Prirodni zeoliti kao reaktivne barijere za obradu procjednih otpadnih voda odlagališta otpada Acronym: NAZELLT Leader: Marina Trgo Jurisdiction: Croatia Funder: HRZZ Funding stream: IP
Study programme	Title: Chemical Technology; specializations in: Materials, Environmental Protection, Mediteranean Cultures Course: Materials Study programme type: university Study level: graduate Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resource	Text
File origin	Born digital
Access conditions	Open access
Terms of use
Public note	Ključne riječi doradio knjižničar/ Key words are revised by the librarian
Created on	2018-04-18 11:23:35