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| Interference Mechanisms and Elimination Methods for COD Determination Distortion in the PS-AOPs Process for Papermaking Wastewater Treatment |
| Received:September 25, 2025 Revised:November 11, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.04.021 |
| Key Words:papermaking wastewater persulfate-based advanced oxidation COD determination distortion |
| Author Name | Affiliation | Postcode | | GUO Fusen* | 1School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong Province, 510006 | 510006 | | GE Qiang | 2China CEC Engineering Corporation, Changsha, Hu’nan Province, 410014 | 410014 | | ZHOU Xianbo | 3Guizhou Pengsheng （Group） Paper Co., Ltd., Qianxinan, Guizhou Province, 552401 | 552401 | | WANG Yan* | 1School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong Province, 510006
4State Key Lab of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | ZHU Congyun | 2China CEC Engineering Corporation, Changsha, Hu’nan Province, 410014 | 410014 | | LIU Kuanyong | 3Guizhou Pengsheng （Group） Paper Co., Ltd., Qianxinan, Guizhou Province, 552401 | 552401 | | WAN Jinquan | 1School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong Province, 510006
4State Key Lab of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 |
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Abstract:To address the issue of COD measurement distortion in papermaking wastewater treatment using persulfate-based advanced oxidation processes (PS-AOPs)， this study identified S2O82-![]() ![]() ， Fe2+， and Cl- as the primary interference sources through monitoring data and elemental analysis (ICP-MS/IC). The interference mechanisms manifested as positive interference caused by oxidant consumption， negative interference due to titrant depletion， and their nonlinear superposition in complex matrices. Based on these findings， an integrated elimination protocol was developed and validated： S2O82-![]() ![]() was reduced using Na2SO3 (mass ratio≥1∶1 at 90 ℃ for 60 min， achieving >94% removal)； HgSO4 masking was optimized according to Cl- concentration (mass ratio 15∶1， with <5% error)； and Fe2+ was corrected via stoichiometric calibration. Spike and recovery experiments demonstrated recoveries of 97%~102%， confirming that the protocol effectively overcame complex matrix interferences and significantly improved COD measurement accuracy. |
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