Modeliranje dinamike ortofosfata pri radu elektrokoagulacijskog uređaja sa željeznim elektrodama

master's thesis

• Title (english): Modeling the electrocoagulation treatment of orthophosphate with iron electrods
• Author: Antonela Musa
• Mentor: Goran Gjetvaj (mentor)
• Committee member: Damir Bekić (predsjednik povjerenstva)
• Committee member: Goran Gjetvaj (član povjerenstva)
• Committee member: Goran Lončar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; (Water Research); Zagreb
• Defense date and country: 2019-07-04, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering; Hydrotechnology

Abstract

Provedeno je istraživanje učinka elektrokoagulacijskog procesa sa željeznim (Fe) elektrodama na smanjenje masene koncentracije fosfata u vodi. Primijenjene su gustoće struje od 30, 75 i 150 A m-2 te inicijalna koncentracija fosfata od 27 mg/L (PO4-P). Postignuta je učinkovitost uklanjanja od 81% nakon 90 min rada reaktora s ugrađenim Al elektrodama pri gustoći struje od 75 A m-2 i uz inicijalnu koncentraciju NaCl od 2 g dm-3. Osim koncentracije fosfata (PO4-P), u komori elektrokoagulacijskog laboratorijskog pilot uređaja praćene su i promjene koncentracije otopljenog kisika (DO), te promjene temperature vode i pH. 3D numerički model primijenjen je za simulaciju polja strujanja i koncentracije fosfata u komori elektrokoagulacijskog uređaja. Modelom pronosa fosfata obuhvaćeni su procesi generiranja i taloženja flokula, te adsorpcije fosfata na flokule. Modelska parametrizacija temelji se na rezultatima mjerenja.

Abstract (english)

The efficiency of the electrocoagulation (EC) process for the removal of phosphate (PO4-P) is analyzed using a batch pilot device with iron electrodes situated within the reactor. The applied current density at the electrodes (30, 75 and 150 A/m2) was the focus of the research. The initial PO4-P concentration is the same in all experiments (27 mg PO4-P/L). The concentrations of PO4-P and dissolved oxygen (DO), as well as the water temperature and pH, were measured in the batch chamber. The initial PO4-P concentration is reduced by 81 % after 90 min of reactor operation when the initial NaCl concentration is 2 g/L, while the current density is maintained at 75 A/m2. Additionally, a three-dimensional (3D) numerical model for PO4-P removal via the EC process is developed. By using the 3D numerical model, spatially continuous velocity fields and the PO4-P concentration were determined. Numerical model of PO4-P transport includes the processes of phosphate adsorption on flocculent, along with coagulated particles settling. Numerical model parametrization relies on the measurement results from the experiments made on batch pilot device.

• Keywords: elektrokoagulacija; pilot uređaj; numerički model; fosfat
• Keywords (english): electrocoagulation; pilot device; numerical model; phosphate
• Language: croatian
• URN:NBN: urn:nbn:hr:237:248330
• Study programme: Title: Civil Engineering; specializations in: Construction Management, Transportation Engineering, Geotechnical Engineering, Hydraulic Engineering, Structural Engineering, Construction Materials, Theory and Modeling of Structures; Course: Hydraulic Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka građevinarstva (magistar/magistra inženjer/inženjerka građevinarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-11-20 07:52:43