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| Study on Advanced Treatment of Papermaking Wastewater by Nano-TiO2 Photocatalysis-Magnetic Flocculation Recovery |
| Received:April 16, 2022 |
| DOI：10.11981/j.issn.1000-6842.2022.03.109 |
| Key Words:Nano-TiO2 colloid;Fe3O4/SiO2;photocatalysis;magnetic flocculation;papermaking wastewater |
| Fund Project:国家自然科学基金项目（21466000）；纳米TiO2胶体对造纸有机污染物光催化降解机理研究（Y1090010）。 |
| Author Name | Affiliation | Postcode | | LIN Yinghang* | State Key Laboratory of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 | 510640 | | CHEN Xiaoquan | State Key Laboratory of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 | 510640 |
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| Abstract: |
| With Nano-TiO2 （Nano-TiO2） as the photo catalyst and Fe3O4/SiO2 （FS） as the magnetic flocculant， a recovery and reuse system for Nano-TiO2 magnetic flocculation recovery and deflocculation release was proposed by adjusting the pH value. The effects of mass ratio of FS and Nano-TiO2 and Nano-TiO2 concentration under same mass ratio on the flocculation performance of the system were studied， and the effect of papermaking wastewater pretreatment on the degradation performance of the cyclic photocatalytic system was investigated. The results show that the higher the mass ratio of FS and Nano-TiO2 or the greater the concentration of Nano-TiO2 under the same ratio， the faster the sedimentation rate of the flocs formed by the two materials， the more conducive to the magnetic recovery of Nano-TiO2. After treated by flocculation with 0.6 g/L Nano-TiO2 and photocatalytic degradation for 180 min， the CODCr， suspended solids， turbidity， and chroma of papermaking wastewater （SBR-T） decreased by 89.2%， 98.2%， 99.3% and 99.3%， respectively， basically realizing advanced treatment of papermaking wastewater. Compared with the centrifugally treated papermaking wastewater （SBR-C） with a decrease in photocatalytic degradation performance by 25.2%， the photocatalytic degradation performance of SBR-T decreased by merely 11.4%； indicating that the pre-removal of suspended solids in wastewater can reduce the loss of Nano-TiO2 in the recycling process so that the system maintains high degradation efficiency. |
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