| Autor: |
Yang, Suiqin1,2 (AUTHOR), Cui, Yuhong2 (AUTHOR), Liu, Zhengqian1,2,3 (AUTHOR) zhengqianliu@hust.edu.cn, Peng, Chao2 (AUTHOR), Sun, Shiquan4 (AUTHOR), Yang, Jingjing5 (AUTHOR), Wang, Mingkui1 (AUTHOR) |
| Předmět: |
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| Zdroj: |
Journal of Environmental Sciences (Elsevier). Dec2024, Vol. 146, p149-162. 14p. |
| Abstrakt: |
• Separable polymers are formed from organic contaminants in raw coking wastewater. • Simultaneous abatement and recovery of organics from coking wastewater is realized. • About 89% of PDS is saved compared to conventional degradation-based process. • Polymerization mechanism is probed by the molecular structure of organic-polymers. • More energy efficient compared to degradation-based processes. Industrial wastewater should be treated with caution due to its potential environmental risks. In this study, a polymerization-based cathode/Fe3+/peroxydisulfate (PDS) process was employed for the first time to treat a raw coking wastewater, which can achieve simultaneous organics abatement and recovery by converting organic contaminants into separable solid organic-polymers. The results confirm that several dominant organic contaminants in coking wastewater such as phenol, cresols, quinoline and indole can be induced to polymerize by self-coupling or cross-coupling. The total chemical oxygen demand (COD) abatement from coking wastewater is 46.8% and the separable organic-polymer formed from organic contaminants accounts for 62.8% of the abated COD. Dissolved organic carbon (DOC) abatement of 41.9% is achieved with about 89% less PDS consumption than conventional degradation-based process. Operating conditions such as PDS concentration, Fe3+ concentration and current density can affect the COD/DOC abatement and organic-polymer yield by regulating the generation of reactive radicals. ESI-MS result shows that some organic-polymers are substituted by inorganic ions such as Cl–, Br–, I–, NH 4 +, SCN– and CN–, suggesting that these inorganic ions may be involved in the polymerization. The specific consumption of this coking wastewater treatment is 27 kWh/kg COD and 95 kWh/kg DOC. The values are much lower than those of the degradation-based processes in treating the same coking wastewater, and also are lower than those of most processes previously reported for coking wastewater treatment. [Display omitted] [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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Full Text from ScienceDirect