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| Study on the Treatment of Wastewater from Bio-CMP Process of Poplar Heartwood by Flocculation Combined with Biological Aeration Filter |
| Received:November 03, 2022 Revised:December 13, 2022 |
| DOI：10.11981/j.issn.1000-6842.2024.01.38 |
| Key Words:white-rot fungus;biochemical-mechanical pulp;flocculation;BAF;wastewater reuse |
| Fund Project:国家自然科学基金项目（21878070）；湖北省高等学校优秀中青年科技创新团队计划项目（T201205）。 |
| Author Name | Affiliation | Postcode | | NIU Hujun | Research Institute of Pulp & Paper Engineering， Hubei University of Technology， Wuhan， Hubei Province， 430068 | 430068 | | XIE Yimin* | Research Institute of Pulp & Paper Engineering， Hubei University of Technology， Wuhan， Hubei Province， 430068
Hubei Provincial Key Lab of Green Materials for Light Industry， Hubei University of Technology， Wuhan， Hubei Province， 430068 | 430068 | | LUO Wenqi | Research Institute of Pulp & Paper Engineering， Hubei University of Technology， Wuhan， Hubei Province， 430068 | 430068 | | ZHOU Anxiang | Hubei Huahai Fiber Technology Co. Ltd， Nanzhang， Hubei Province， 441500 | 441500 | | XUE Chao | Hubei Huahai Fiber Technology Co. Ltd， Nanzhang， Hubei Province， 441500 | 441500 |
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| Abstract: |
| In this study， poplar heart-wood were pretreated with the white-rot fungus Trametes sp. 48424. The integrated wastewater generated during chemical-mechanical pulping was treated by combining flocculation and precipitation with a biological aeration filter （BAF）， to study the effect of wastewater reuse on biochemical-mechanical pulping and BAF， and to explore the feasibility of reuse of treated wastewater. The results showed that the use of white-rot fungus pretreatment technology could offset the CODCr produced by adding NaOH of 2% （relative to raw material oven dry weight）. The maximum removal rate of CODCr after treatment was 49.9%. the maximum removal rate of CODCr treated by BAF was up to 91.8%. The effluent CODCr was reduced to 39.8 mg/L， which met the standards for reuse and discharge of pulping wastewater. Wastewater reuse would reduce the overall efficiency of the BAF， and the treated wastewater was reused in the pulping system， which would also result in a certain impact on the paper performance. After reuse once， the effluent CODCr rised to 76.3 mg/L， so the treated wastewater could only be reused once. |
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