| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document

Title:Predobdelava studenčne vode za proces reverzne osmoze
Authors:Ostroško, Urška (Author)
Petrinić, Irena (Mentor) More about this mentor... New window
Simonič, Marjana (Co-mentor)
Files:.pdf UN_Ostrosko_Urska_2018.pdf (2,74 MB)
 
Language:Slovenian
Work type:Bachelor thesis/paper (mb11)
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Za pridobivanje pitne vode iz studenčnice se lahko uporablja proces reverzne osmoze. Podzemne vode, kamor po večini uvrščamo studenčne vode, so bogate z raztopljenimi minerali ter posledično vsebujejo veliko kalcijevih in magnezijevih hidrogenkarbonatov, ki povzročajo trdoto vode. V procesih s povišanim tlakom ali temperaturo kot je reverzna osmoza, se skupaj s suspendiranimi delci kot je SiO2 obarjajo ter mašijo membrane. Rešitev tega problema so različni postopki predobdelave, ki problematične snovi odstranijo oziroma dovolj zmanjšajo. V diplomski nalogi smo iskali primerno metodo, da bi čim bolj zmanjšali vsebnost kalcijevih in magnezijevih hidrogenkarbonatov ter silicijevega dioksida, ki je prav tako prisoten v uporabljeni studenčni vodi. Preizkusili smo različne postopke obdelave te vode, pri katerih smo za večjo učinkovitost med samimi postopki višali temperaturo in pH vrednost. Uporabljene metode so bile mehčanje z apnom, koagulacija ter njuna kombinacija. Pri koagulaciji smo uporabili dva koagulanta, in sicer PACl ter Al2(SO4)3. Vzorčeni vodi smo pred in po obdelavi določali: SiO2, celokupno, karbonatno, kalcijevo, magnezijevo in nekarbonatno trdoto; motnost, pH, elektroprevodnost, temperaturo, skupne raztopljene snovi (TDS), železo, zeta potencial ter velikost delcev. Rezultati so pokazali, da je najučinkovitejša metoda bilo mehčanje z apnom pri temperaturi med 58 °C in 60 °C in pH 10, ki smo ga dosegli z dodatkom NaOH. Precej učinkovita je bila tudi koagulacija s PACl in apnom pri enakem temperaturnem območju. Pri tem se je sicer odstranilo veliko SiO2 vendar precej manj trdote.
Keywords:studenčna voda, trdota vode, silicijev dioksid, mehčanje z apnom, koagulacija
Year of publishing:2018
Publisher:[U. Ostroško]
Source:Maribor
UDC:628.1.036:66.081.63(043.2)
COBISS_ID:21953558 Link is opened in a new window
NUK URN:URN:SI:UM:DK:M1I6LFXZ
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
Views:156
Downloads:31
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FKKT
:
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Secondary language

Language:English
Title:Pretreatment of ground surface water for reverse osmosis process
Abstract:One of the ways of purifing well water to meet drinking water criteria is by using reverse osmosis. Well water which is usually classified as ground water is enriched with dissolved minerals and consenquently contains a great amount of calcium and magnesium bicarbonates. These ions cause hardness of the water and along with suspended particles such as SiO2 they precipitate causing membrane fouling in processes with increased pressure or temperaure such as reverse osmosis. A solution to this are different pretreatment processes that reduce or even remove problematic substances. In this thesis we were searching for a suitable method for reducing calcium and magnesium bicarbonates of the water and silica it contains to the maximum extent. We tested different pretreatment processes where we increased temperature and pH value to achieve greater efficiency. The used methods were lime softening, coagulation and the combination of both. For coagulation we used coagulants PACl and Al2(SO4)3. Before and after treatment, we measured: SiO2, total hardness, carbonate hardness, calcium hardness, magnesium hardness, non carbonate hardness, turbidity, pH value, conductivity, temperature, total dissolved solids (TDS), iron, zeta potential and particle size of the sampled water. The results showed that the most efficient was the lime softening pretreatment method with temperature between 58 °C and 60 °C and pH value of 10, which we achieved with the addition of NaOH. Also quite effective was coagulation with PACl and lime in the same temperature interval, which removed a great deal of SiO2 but a lot less hardness.
Keywords:ground water, water hardness, silica, lime softening, coagulation


Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica