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| Study on Multiphase Catalytic Ozone Oxidation Combined with Electrocatalytic Oxidation for Pulping and Papermaking Wastewater Treatment |
| Received:March 26, 2025 Revised:April 12, 2025 |
| DOI：10.11981/j.issn.1000-6842.2026.01.149 |
| Key Words:pulping and papermaking wastewater;electrolysis of water;hydroxyl radical;ozone;recycle and reuse |
| Fund Project:湖南省自然科学基金（2023JJ30012）。 |
| Author Name | Affiliation | Postcode | | LI Shu* | 1School of Chemical and Pharmaceutical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410076 | 410076 | | YAN Yongxiang* | 1School of Chemical and Pharmaceutical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410076 | 410076 | | WANG Yulong | 1School of Chemical and Pharmaceutical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410076 | 410076 | | LI Xikang | 2Dongguan Jianhui Paper Co.， Ltd.， Dongguan， Guangdong Province， 523221 | 523221 |
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| Abstract: |
| Based on multiphase catalytic ozone oxidation and electrocatalytic oxidation， this study designed an electrolysis deionized water system capable of generating hydroxyl radicals （·OH） and ozone （O₃）， utilizing a composite anode of lanthanum oxide （La₂O₃） from the lanthanide series， and cerium oxide （CeO₂）， paired with a platinum plate cathode. This system was used to treat pulping wastewater of chemical mechanical pulp， white water of whiteboard， white water of unbleached kraft cardboard， and biochemical wastewater （SBR water）. This study also investigated the impact of reusing treated SBR water in papermaking process on prepared paper mechanical properties. The results indicated that at a current of 10 A， the system generated an O₃ flow rate of 4 g/min. When treating the aforementioned pulping and papermaking wastewater， it could significantly reduce chemical oxygen demand （CODCr， removal rate of 30.4%~81.6%）， particulate charge demand （PCD， removal rate of 49.5%~72.6%）， and turbidity （removal rate of 81.6%~87.4%） without producing sludge. Upon reuse of treated SBR water in the papermaking process， up to 50% fresh water replacement was achievable， and the prepared paper had excellent properties. |
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