From lab-scale to pilot-scale treatment of real wastewater from the production of rayon fiber

• Published in: Process safety and environmental protection Vol. 171; pp. 834 - 846
• Main Authors: Kuchtová, Gabriela, Herink, Petr, Herink, Tomáš, Chýlková, Jaromíra, Mikulášek, Petr, Dušek, Libor
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2023
• Subjects: Electro-assisted Fenton oxidation; Electrochemical oxidation, Zn2+ adsorption; Fenton oxidation; Macroporous BDD electrodes; Rayon production; Rayon production; Macroporous BDD electrodes; Electrochemical oxidation, Zn2+ adsorption; Electro-assisted Fenton oxidation; Fenton oxidation
• ISSN: 0957-5820; 1744-3598
• DOI: 10.1016/j.psep.2023.01.059

The subject of our study involved the treatment of real process wastewater from the production of rayon fiber. During the annual monitoring of the production facility, we performed a mass balance of three problematic sources of process wastewater and analyzed them repeatedly. All three sources showed high values of COD = 0.4–30 g/L, TOC = 0.09–7.1 g/L and the concentration of Zn2+ 0.09–0.5 g/L. At a total volume of 1.84 million m3, this represents a significant pollution source for the Elbe River. At lab-scale, we tested a combination of filtration, microfiltration, and oxidation using the Fenton, electro-assisted Fenton, and the electrochemical oxidation methods, both on the plate and newly developed macroporous BDD electrodes on a ceramic substrate, along with the final adsorption of Zn2+ emissions on the strongly acidic cation exchange resin Lewatit Mono plus S108. It was tested in Na+ and H+ cycles. Using an optimized technological sequence, we have achieved a COD reduction of up to 98%, and a TOC reduction of 85%. During the H+ cycle cation regeneration by sulfuric acid, Zn2+ emissions were converted to zinc sulfate that can be recycled in the spinning bath of the production process. The method was verified at a pilot scale. [Display omitted]