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| Design and Application of Pretreatment Process for High-concentration Wastewater from 6 000 t/a Pulping Residue Processing System |
| Received:June 09, 2025 Revised:July 18, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.04.022 |
| Key Words:pulping residue high-concentration wastewater pretreatment coagulation and clarification |
| Fund Project:云南省专家工作站项目（202605AF350071）；中轻集团科技创新基金项目-废纸制浆精筛渣回收技术及系统开发（ZQ2023YY-GX01）；高品质思茅松绒毛浆产品研发（202603AS090011-3）。 |
| Author Name | Affiliation | Postcode | | DU Jianyang* | 1Yunnan Yunjing Forest & Paper Co., Ltd., Jinggu, Yunnan Province, 666499 | 666499 | | LI Nan | 2China National Pulp and Paper Research
Institute Co., Ltd., Beijing, 100102 | 100102 | | XU Piyuan | 1Yunnan Yunjing Forest & Paper Co., Ltd., Jinggu, Yunnan Province, 666499 | 666499 | | SUN Tingcong | 1Yunnan Yunjing Forest & Paper Co., Ltd., Jinggu, Yunnan Province, 666499 | 666499 | | FAN Shujie | 2China National Pulp and Paper Research
Institute Co., Ltd., Beijing, 100102 | 100102 | | WANG Yuejiang* | 2China National Pulp and Paper Research
Institute Co., Ltd., Beijing, 100102 | 100102 | | SU Zhenhua* | 2China National Pulp and Paper Research
Institute Co., Ltd., Beijing, 100102 | 100102 |
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| Abstract:To treat the 3 600 m3/d of highly concentrated organic wastewater (chemical oxygen demand (CODCr)≈45 000 mg/L， suspended solids (SS) content≈21 000 mg/L) generated during the resource recovery process of 6 000 t/a pulping residue， this study designed and constructed a pretreatment process based on coagulation and clarification technology， which prior to discharging into the existing wastewater treatment system. Operational results indicated that， using a flocculant blend comprising polyaluminum chloride (PFC， Fe3+≥11%)， polyacrylamide (PAM， mass fraction 0.1%)， and clay emulsion (mass fraction from 1.5% to 1.7%)， the pretreatment technology achieved a CODCr removal rate of ≥75% for the high-concentration wastewater， with a SS content removal rate of ≥95%. The effluent CODCr was ≤918 mg/L and SS content was ≤132 mg/L， meeting the influent requirements of the existing wastewater treatment system. Additionally， the biodegradability (BOD5/CODCr) of the effluent in the system improved by approximately 5%. It effectively resolved clogging issues in the subsequent wastewater treatment system， reduced chemical consumption in the shallow-bed flotation unit by 50%， and improved sludge dewatering efficiency. |
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