Optimizacija predobrade sekundarnog efluenta otpadne vode za termičku obradu nusproizvoda životinjskog podrijetla za nanofiltraciju

undergraduate thesis

• Title (english): Optimization of the pretreatment of a rendering plant secondary effluent for the nanofiltration
• Author: Ana Kraš
• Mentor: Davor Dolar (mentor)
• Committee member: Davor Dolar (predsjednik povjerenstva)
• Committee member: Danijela Ašperger (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2017-09-22, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Mechanical, Thermal and Separation Processes

Abstract

Kako bi se poboljšala kvaliteta sekundarnog efluenta (SE) kafilerijske otpadne vode (KOV) i učinilo ga se prikladnim za obradu nanofiltracijom (NF), kao postupak predobrade korištena je koagulacija i pješčana filtracija (SF). Optimalni uvjeti za koagulaciju (pH = 5,52 i γ(Fe3+) = 18,54 mg L^-1) dobiveni su uz pomoć metode odzivne površine na temelju rezultata Jar testa. Pri tim uvjetima dolazi do najvećeg uklanjanja ključnih parametara - ukupnog ugljika (TC) i mutnoće. Efikasnost pojedinog postupka predobrade provedena je uspoređivanjem rezultata (pada fluksa, FTIR spektara membrana, TC-a, anorganskog ugljika (IC), otopljenog organskog ugljika (DOC), mutnoće, pH nakon koagulacije i električne provodnosti) dobivenih nanofiltracijom sekundarnog efluenta s koagulacijom nakon optimizacije i/ili pješčanom filtracijom ili bez predobrade. Pješčana filtracija nije se pokazala učinkovitim postupkom predobrade za ispitivani tip SE, jer nije uklonila ukupni ugljik, dok je koagulacija uklonila ukupni ugljik, ali i mutnoću. Iz toga slijedi da je koagulacija prigodan postupak predobrade sekundarnog efluenta za nanofiltraciju, dok pješčana filtracija može dodatno, u blagoj mjeri, poboljšati rezultate.

Abstract (english)

In order to improve the quality of the rendering plant secondary effluent and make it suitable for nanofiltration; coagulation and sand filtration (SF) were used as pretreatments. Optimal conditions for coagulation (pH = 5.52 and γ(Fe3+) = 18.54 mg L^-1) were obtained by response surface methodology to Jar test results. Under these conditions, the highest removal of key parameters - total carbon (TC) and turbidity occurs. Efficiency of each pretreatment procedure was evaluated by comparing the results (flux decline, FTIR spectra of the membrane surface, TC, inorganic carbon (IC), dissolved organic carbon (DOC), turbidity, pH after coagulation and electrical conductivity) of secondary effluent nanofiltration either with coagulation after optimization and/or sand filtration, or without pretreatment. Sand filtration was not an effective pretreatment for tested SE because it removed only turbidity, while coagulation removed total carbon as well as turbidity. Therefore, coagulation is a promising pretreatment of secondary effluents for nanofiltration, while sand filtration can additionally, slightly improve the results.

• Keywords: nanofiltracija; sekundarni efluent; predobrada; koagulacija; pješčana filtracija; optimizacija
• Keywords (english): nanofiltration; secondary effluent; pretreatment; coagulation; sand filtration; optimization
• Language: croatian
• URN:NBN: urn:nbn:hr:149:845004
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-03-30 11:51:52