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Title:VPLIV OBRATOVALNIH POGOJEV NA HITROST PRENOSA VODE PRI PROCESU OSMOZE
Authors:ID Kolar, Veronika (Author)
ID Petrinić, Irena (Mentor) More about this mentor... New window
ID Simonič, Marjana (Comentor)
Files:.pdf VS_Kolar_Veronika_2016.pdf (1,84 MB)
MD5: 1EF745207C718A3D730737059B678331
 
Language:Slovenian
Work type:Undergraduate thesis
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Osmoza je membranski proces, ki mu zadnja leta posvečajo veliko pozornosti, še posebej zato, ker predstavlja možnosti za boljše in predvsem bolj ekonomično pridobivanje pitne vode ter ponovno uporabo industrijskih in odpadnih voda. Pri prenosu snovi je pomembna pravilna izbira vhodne in gonilne raztopine, saj proces osmoze izkorišča razliko v osmotskem tlaku med dvema raztopinama. Namen diplomskega dela je bil določiti vpliv različnih obratovalnih pogojev na prenos snovi skozi asimetrično membrano med procesom osmoze. Uporabili smo biomimetične membrane z vgrajenimi proteini akvaporini, za katere je značilno, da omogočijo hitrejši pretok molekul vode skozi membrano in hkrati zmanjšajo povratni tok topljenca v vhodno raztopino. V prvem delu smo določali vpliv uporabe treh različnih gonilnih raztopin, in sicer vodne raztopine NaCl, CaCl2 in MgCl2. Hkrati smo spremljali tudi spremembe glede na različne koncentracije raztopine NaCl. Gonilne raztopine, ki so imele za topljenec soli z višjo molsko maso in večjim premerom ionov, to sta v našem primeru CaCl2 in MgCl2, so imele manjši povratni tok topljenca skozi membrano, kar je ena izmed lastnosti dobrih gonilnih raztopin. Višje koncentracije raztopin pa so rezultirale višji pretok molekul vode skozi membrano. Višji pretok vode skozi membrano smo opazili tudi pri procesu osmoze, kjer je aktivna stran membrane bila v stiku z gonilno raztopino. Hitrost pretoka raztopin na vsaki strani membrane je tudi eden izmed obratovalnih parametrov, ki smo ga spreminjali in spremljali vpliv na prehod vode skozi asimetrično membrano. Eksperimenti so bili izvedeni pri dveh različni pretokih raztopin, in sicer, 50 mL/min in 70 mL/min. Ugotovili smo, da ob spremenjenih pretokih, ne pride do bistvenih sprememb pri fluksu vode in povratnemu toku topljenca. Ravno tako, smo vpliv hitrosti pretoka spremljali med mašenjem membrane z alginatom, kjer tudi ni prišlo do sprememb v prenosu snovi skozi membrano. Na koncu smo s pridobljenimi meritvami določili koeficient permeabilnosti A in koeficient selektivnosti B, kjer smo ugotovili, da sta dosti bolj odvisna od obratovalnih pogojev kot sama hitrost snovi skozi membrano
Keywords:osmoza, biomimetične membrane, gonilna raztopina, permeabilnost, selektivnost
Place of publishing:Maribor
Publisher:[V. Kolar]
Year of publishing:2016
PID:20.500.12556/DKUM-63397 New window
UDC:66.081.63(043.2)
COBISS.SI-ID:20311062 New window
NUK URN:URN:SI:UM:DK:CY2BXLFV
Publication date in DKUM:30.09.2016
Views:1391
Downloads:114
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FKKT
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Secondary language

Language:English
Title:THE IMPACT OF OPERATIONAL PARAMETERS ON THE WATER TRANSPORT IN FORWARD OSMOSES PROCESS
Abstract:Forward osmosis is a membrane process, which in recent years devoted a great attention, especially because it presents an efficient and economical production of potable water and reuse of industrial wastewater. The feed and appropriate draw solution have an important role in the water and solute transport, because the driving force of forward osmosis is a difference in osmotic pressure between two solutions. The goal of this diploma work was to determine the impact of various operating conditions on the water and salt transport through asymmetric membrane with embedded proteins aquaporin. The incorporated proteins enable higher flow-rate of water molecules through the membrane and at the same time reduce the salt reverse flux. In the first part of experimental work we define the impact of different types of draw solutions, namely, NaCl, CaCl2 and MgCl2. At the same time the influence of different concentrations of NaCl was determined. Draw solutions with a higher molecular weight and a larger ion diameter, which in this case are CaCl2 and MgCl2, provided a lower salt reverse flux, which is one of the benefits of draw solutions. Higher concentrations of draw solution has resulted in a higher flow rate of the water molecules through the membrane. The higher water flux was also observed in the process of osmosis where the active side of the membrane was in a contact with draw solution. One of the operating parameters, which has been changed is the flowrate of the solutions on either side of the membrane. Experiments were carried out at two different flow rates of solutions, namely, 50 mL/min and 70 mL/min. We found that the modified flow did not occur any significant change in the water flux and salt reverse flux. In additionally, we monitored the impact of flow velocity during the fouling experiment. There has been no changes in the water flux at higher flowrate. Within the final part of experimental work, we obtained the coefficient of permeability A, and the selectivity coefficient B, where we have found that they are much more dependent on the operating conditions in comparison with water flux and salt reverse flux.
Keywords:forward osmosis, biomimetic membrane, draw solution, water permeability, selectivity


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