AOX degradation of the pulp and paper industry bleaching wastewater using nZVI in two different agitation processes
| Autor: | Ênio Leandro Machado, Isabel Capela, Carlos Perez Bergmann, Adriane De Assis Lawisch Rodriguez, Luís A.C. Tarelho, Camila Stockey Erhardt, Tania Maria Basegio, Diosnel Antonio Rodriguez Lopez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Zerovalent iron
Nano zero valent iron Adsorbable organohalogens Soil Science 02 engineering and technology Plant Science 010501 environmental sciences 021001 nanoscience & nanotechnology Pulp and paper industry 01 natural sciences Bleaching wastewater chemistry.chemical_compound Degradation chemistry Wastewater Optimal combination Degradation (geology) Sewage treatment Cellulose Process time 0210 nano-technology Hydrogen peroxide 0105 earth and related environmental sciences General Environmental Science |
| Popis: | The pulp and paper industry has been researching different treatments for the degradation of adsorbable organohalogens (AOX). In this work, two agitation processes (mechanical and ultrasound) were analyzed in the AOX degradation of the bleaching wastewater using nano zero valent iron (nZVI). The work used different variables for the AOX removal process, such as pH, time, nZVI, and hydrogen peroxide (H 2 O2) concentration. Results show an increase in AOX degradation when a higher nZVI concentration is used. The optimal combination of variables for the treatment with mechanical agitation was found in the ratio 2:5 (nZVI : H 2 O2), degrading 85% of AOX in 60 min, with acid pH. Ultrasound treatment consisted of half process time and less degradation than mechanical agitation treatment. The 2:5 ratio in ultrasound agitation degraded 55% of AOX within 30 min at the end of the process. Both methods of the homogenization process of zero valent iron nanoparticles in the bleaching wastewater of the paper and cellulose industry are efficient. However, the mechanical stirring process has a more significant potential for AOX degradation. The variables (pH, concentration of nZVI and H 2 O2 and duration of the process) used in the bleaching wastewater treatment process must be considered for future implementation in the pulp and paper industry. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|