Oporaba tekstilne otpadne vode membranskim procesima i ispitivanje efikasnosti bojadisanja zeta potencijalom

master's thesis

• Title (english): Reuse of textile wastewater with membrane processes and investigation of dyeing efficiency with zeta potential
• Author: Šejla Sarunović
• Mentor: Davor Dolar (mentor)
• Committee member: Davor Dolar (predsjednik povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Committee member: Zvonimir Katančić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-09, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Sve veća potrošnja vode za industrijske i kućne potrebe dovodi do njezine nestašice u mnogim zemljama. Industrije, od kojih je tekstilna jedna od najvećih na svijetu, također su suočene sa sve većim troškovima vodoopskrbe i procesa pročišćavanja te strožim kontrolama pri ispuštanju onečišćenih industrijskih otpadnih voda. Zbog navedenog javlja se potreba za oporabom otpadnih voda tekstilne industrije, što je postala privlačna opcija za zaštitu okoliša i održivi industrijski razvoj. Među raznim tehnologijama razvijenim u tu svrhu, istaknuli su se membranski procesi koji jamče prihvatljivu kvalitetu otpadnih voda namijenjenih oporabi u procesu tekstilne industrije. Cilj ovog rada bio je oporaba tekstilne otpadne vode (TOV) u svrhu procesa bojadisanja. Obrađen je uzorak permeata membranskog bioreaktora (MBR) procesom ultrafiltracije (UF) pri radnom tlaku od 10 bar primjenom 2 kDa membrane u obliku ravne plahte. Kvaliteta MBR i UF permeata određena je analizom sljedećih fizikalno - kemijskih parametara: mutnoća, električna provodnost (κ), kemijska potrošnja kisika (KPK), ukupno obojenje (436, 525, 620 nm), pH - vrijednost i ukupni organski ugljik (eng. Total organic carbon, TOC). Proces bojadisanja provodio se UF permeatom i vodovodnom vodom te se učinkovitost obojenja određivala mjerenjem zeta potencijala i spektrofotometrijskom analizom uzoraka pletiva. Također, praćeni su i fizikalno - kemijski parametri uzoraka obojenih vodovodnih voda izuzetih tijekom procesa bojadisanja i ispiranja. Rezultati fizikalno - kemijske analize ukazali su na povišene vrijednosti parametara MBR permeata te potrebu za dodatnom UF obradom. UF obradom postiglo se značajno smanjenje mutnoće (98,8 %), ukupnog obojenja (91,4 %), KPK (90,4 %) te TOC-a (77,4 %). Nešto niži postotak smanjenja dobiven je kod električne provodnosti (41,7 %). Na temelju rezultata zeta potencijala i spektrofotometrijske analize dobivena je bolja obojenost uzorka pletiva koji je bojadisan UF permeatom.

Abstract (english)

Increasing consumption of water for industrial and domestic needs is leading to it’s shortage in many countries. Many of today's industries, of which textile is one of the largest in the world, are now facing and struggling with increased costs of water supply and treatment processes, as well as strict controls on wastewater discharge from industrial sources, which usually contains heavy pollutants. Due to the above, there is a crucial need for treatment of wastewater from the textile industry, which now represents an attractive option for environmental protection and sustainable industrial development. Among various technologies developed for this purpose, membrane processes that guarantee acceptable quality of wastewater intended for reuse in textile industry process, were accentuated. The aim of this study was the reuse of textile wastewater for the purpose of dyeing process. A membrane bioreactor (MBR) permeate was treated by ultrafiltration (UF) at a working pressure of 10 bar using a 2 kDa flat sheet membrane. The quality of MBR and UF permeates was determined by analysis of the following physico - chemical parameters: turbidity, conductivity (κ), chemical oxygen demand (COD), average color (436, 525 and 620 nm), pH, and concentration of total organic carbon (TOC). The dyeing process was performed with UF permeate and tap water used in the factory and the dyeing efficiency was determined by measuring the zeta potential and spectrophotometric analysis of knitted cotton fabrics. Physico - chemical parameters of colored tap water samples, taken during the dyeing and rinsing process, were also monitored. The results of physico - chemical analysis indicated increased values of MBR permeate parameters and the need for additional UF treatment. UF treatment achieved a significant reduction in turbidity (98.8%), average color (91.4%), COD (90.4%), and TOC (77.4%). A slightly lower percentage of conductivity reduction was obtained (41.7%). Based on the results of zeta potential and spectrophotometric analysis, a better coloration of the knitted cotton fabric was obtained with UF permeate.

• Keywords: tekstilna otpadna voda; membranski bioreaktor; ultrafiltracija; bojadisanje; zeta potencijal
• Keywords (english): textile wastewater; membrane bioreactor; ultrafiltration; dyeing; zeta potential
• Language: croatian
• URN:NBN: urn:nbn:hr:149:669654
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-03-10 15:54:04