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| Preparation of Modified Carboxymethyl Chitosan and Its Removal of Fluorine from Smelting Wastewater |
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Received:August 02, 2022
Revised:August 02, 2022
Accepted:August 09, 2022
Published Online:September 16, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.10.020 |
| KeyWord:modified carboxymethyl chitosan; flocculation; wastewater; fluoride removal |
| Author | Institution |
| MIAO Yu |
矿冶科技集团有限公司 |
| LIN Xing-jie |
矿冶科技集团有限公司 |
| LUO Chun |
河池市南丹生态环境局 |
| ZHANG Chi |
矿冶科技集团有限公司 |
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| Abstract: |
| Removal of fluoride from wastewater with carboxymethyl chitosan (CMC) modified by self-prepared iron-bioflocculant(BPFS) was investigated. The effects of mass ratio of CMC to iron-bioflocculant(CMC/Fe), BPFS-CMC dosage, pH value, and reaction time on removal of fluoride ions were studied. The results show that the residual fluoride concentration rises with the increase of CMC/Fe, and drops with the increase of BPFS-CMC dosage. The removal rate of fluoride can be greatly improved compared with adding CMC alone, increasing from 33.05% to 62.70% with the BPFS-CMC dosage of volume fraction of 3%. Acidic conditions are favorable for removal of fluoride ions. The concentration of residual fluoride ions drops slowly with the increase of reaction time. The optimum conditions for fluoride removal are as follows: CMC/Fe is 0.05, BPFS-CMC dosage is 3%(volume fraction), pH value is 5, and reaction time is 10 minutes. The residual concentration of fluoride is 7.78 mg/L under the above conditions, which is less than the Emission Standards of Pollutants for Lead and Zinc Industry(GB 25466—2010). |
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