Uklanjanje bojila iz modelnih otpadnih voda

undergraduate thesis

• Title (english): Retention of dyes from model wastewaters
• Author: Tesa Herceg
• Mentor: Davor Dolar (mentor)
• Committee member: Davor Dolar (predsjednik povjerenstva)
• Committee member: Juraj Šipušić (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-09-18, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Tekstilne otpadne vode neizbježan su rezultat modernoga života, a njihovo je pročišćavanje važan zadatak za današnju industriju. Cilj obrade tekstilne otpadne vode jest uklanjanje neželjenih elemenata iz vode ili smanjivanje njihove koncentracije, i to kako bi ju se učinilo primjenjivom za upotrebu ili pak ispuštanje u prirodne prijemnike. U te svrhe koristila se ultrafiltracija (UF), kao jedan od tlačnih membranskih separacijskih procesa. Cilj rada bio je utvrditi sposobnost ultrafiltracijskih membrana za uklanjanje crvenoga bojila. Praćeni su neki od glavnih fizikalno-kemijskih parametara definirani pravilnikom o otpadnim vodama, i to: mutnoća, pH, vodljivost, kemijska potrošnja kisika (KPK) te obojenje. Korištene su četiri komercijalno dostupne UF membrane: GH, GK, PT i PU. Glavna je razlika među njima bila u graničnoj molekulskoj masi (MWCO). S obzirom na različit MWCO, modelne su otopine obrađivane na različitim tlakovima (2-10 bara). Sve ispitane UF membrane s visokom su učinkovitošću smanjile mutnoću. Vrijednosti pH kod svih membrana blago su povećane. Efikasnost smanjenja električne vodljivosti i vrijednosti KPK uglavnom opadaju rastom složenosti matrice i smanjenjem koncentracije bojila. Najveće uklanjanje obojenja (od 98,9 do 99,9 %) dobiveno je GH membranom (2 000 Da), dok je PU membranom (10 000 Da) dobiveno najmanje uklanjanje od 40,3 do 93,7 %. Smanjenjem MWCO membrane povećava se efikasnost uklanjanja obojenja.

Abstract (english)

Textile wastewater is an inevitable result of modern life, and its treatment is a very important task of today's industry. The goal of textile wastewater treatment is to remove unwanted elements from the water or reduce their concentration to make it applicable for use or for discharge into natural receivers. For these purposes, ultrafiltration (UF) was used as one of the pressure membrane separation processes. The aim of the study was to determine the ability of ultrafiltration membranes to remove red dye. Some of the main physico-chemical parameters defined by the wastewater ordinance were monitored; turbidity, pH, conductivity, chemical oxygen demand (COD), and color intensity. Four commercially available UF membranes were used: GH, GK, PT, and PU. The main difference between them was in the molecular weight cut-off (MWCO). Due to the different MWCO wastewater was treated at different pressures (from 2 to 10 bar). All tested UF membranes reduced turbidity with high efficiency. The pH values of all membranes are slightly increased. The efficiency of reducing electrical conductivity and COD values generally decrease with matrix complexity and decreasing dye concentration. The highest colour removal of 98.9-99.9 % was obtained with GH membrane (2,000 Da) while with PU membrane (10,000 Da) the smallest removal of 40.3-93.7 % was obtained. Reducing MWCO membranes increases the efficiency of colour removal.

• Keywords: tekstilne otpadne vode; ultrafiltracija; membranski separacijski procesi; bojilo
• Keywords (english): textile wastewater; ultrafiltration; membrane separation processes; dye
• Language: croatian
• URN:NBN: urn:nbn:hr:149:284996
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-05-04 08:16:18