Treatment of textile wastewater by MBR system
Author
Gramkow Hostrup Glinvad, Søren
Term
4. term
Education
Publication year
2012
Submitted on
2012-05-30
Pages
47
Abstract
Dette speciale undersøger, hvordan farve kan fjernes effektivt fra tekstilspildevand ved at kombinere MBR-teknologi (membranbioreaktor) med avancerede oxidationsprocesser (AOP). MBR er interessant, fordi det kan levere en stabil rensning af høj kvalitet ved at kombinere biologisk nedbrydning med membranfiltrering. Som AOP blev Fentons reaktion valgt, en jern- og brintoveriltebaseret proces, der skaber stærke oxidationsmidler og er kendt for at nedbryde farvestoffer. Forsøget blev udført i et laboratorie-MBR-system ved Maribor Universitet i Slovenien. Systemet var konstrueret som et eksternt, neddykket MBR-anlæg. Fentons reaktion blev anvendt både på det rå spildevand og på permeatet (det filtrerede vand) fra MBR-systemet. For at vurdere farvefjernelsen blev absorbans målt, dvs. hvor meget lys vandet absorberer, hvilket afspejler mængden af farvestof. Der blev observeret en tydelig reduktion i absorbansen i permeatet, og en klart synlig farvefjernelse blev opnået. Derudover viste resultaterne en effektiv fjernelse af kemisk iltforbrug (COD), ammonium, nitrat, nitrit og total kvælstof. Behandlingen med Fentons reaktion gav effektiv farvefjernelse både før og efter MBR-behandlingen. Konklusionen er, at MBR-behandling er en effektiv metode til at nedbryde farvestoffer i tekstilspildevand. Med optimale driftsbetingelser kan der opnås en høj fjernelse af både farve og næringsstoffer. Anvendelse af AOP kan yderligere forbedre permeatkvaliteten og øge mulighederne for at genbruge vandet i farveprocessen.
This thesis investigates how to efficiently remove color from textile wastewater by combining MBR technology (membrane bioreactor) with Advanced Oxidation Processes (AOP). MBR is of interest because it can deliver stable, high-quality treatment by coupling biological degradation with membrane filtration. For the AOP step, Fenton’s reaction was chosen—an iron and hydrogen peroxide–based process that generates strong oxidants and is known to break down dyes. Experiments were carried out in a lab-scale MBR system at the University of Maribor, Slovenia. The system was built as an external, submerged MBR unit. Fenton’s reaction was applied to both the raw wastewater and the permeate (the filtered water) from the MBR. To evaluate color removal, absorbance was measured, meaning how much light the water absorbs—a proxy for dye concentration. A clear reduction in absorbance was observed in the permeate, and a visibly strong color removal was achieved. The results also showed efficient removal of chemical oxygen demand (COD), ammonium, nitrate, nitrite, and total nitrogen. Treating both wastewater and permeate with Fenton’s reaction produced effective color removal before and after the MBR. The study concludes that MBR treatment is an effective method for degrading dyes in textile wastewater. Under optimal operating conditions, high removal of color and nutrients can be achieved. Using AOP can further improve permeate quality and increase the likelihood of reusing the water in the dyeing process.
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