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| Study on the Cause Analysis of Performance Decline and Enhancement by Coagulation Pretreatment in Camphorwood Chemi-mechanical Pulping Wastewater Treatment System |
| Received:January 15, 2026 Revised:February 11, 2026 |
| DOI：10.11980/j.issn.0254-508X.2026.04.019 |
| Key Words:chemi-mechanical pulp camphorwood pulping characteristic pollutants wastewater treatment anaerobic enhancement |
| Author Name | Affiliation | Postcode | | ZHONG Tianqi* | 1Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, Guangdong Province, 518055
2China Paper Investment Co., Ltd., Beijing, 100020
3Hunan Chengtong Tianyue Environmental Protection Technology Co., Ltd., Yueyang, Hu’nan Province, 414002 | 414002 | | ZUO Jian’e* | 1Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, Guangdong Province, 518055
4State Key Joint Lab of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084 | 100084 |
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| Abstract:The response characteristics of key indicators such as COD in the anaerobic， aerobic and advanced treatment units of a pulp and paper mill in Hu’nan province from 2021 to 2024 were tracked in this study， to analyze the inhibitory effect of camphorwood process wastewater on the anaerobic treatment unit in relation to the changes in camphorwood consumption during APMP pulping. The results showed that as the proportion of camphorwood increased from 4.24% to 12.81%， the CODCr volumetric loading rate of the anaerobic system exceeded the design value by 29%， and the influent CODCr concentration increased by 16.5%. Luminescent bacteria toxicity tests confirmed that the 100% camphorwood chemimechanical pulping wastewater exhibited the highest toxicity， and the toxicity increased with the increasing COD concentration. Under identical CODCr loading conditions， the anaerobic CODCr removal efficiency decreased in a dose-dependent manner when the camphorwood pulping wastewater proportion increased from 5% to 15%. On this basis， the efficacy of introducing coagulation pretreatment upstream of the anaerobic unit for the influent quality improvement was evaluated in this study. Under the optimized conditions (5 g/L PAC with appropriate PAM)， the coagulation pretreatment reduced the influent CODCr and SS by 25.9% and 28.7%， respectively， and increased the subsequent anaerobic CODCr removal efficiency by 14.5%. |
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