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Outline
A continuous baffle flow electrocatalytic oxidation device, using porous Ti4O7 anodes prepared through vacuum plasm spraying technology, was developed to achieve the effective degradation of sulfamethoxazole (SMX) in wastewater. The effects of operation conditions on SMX degradation efficiency were examined, the energy consumption and the stability of the system were assessed in the treatment of actual wastewater. The possible electrocatalytic degradation mechanism of SMX was also proposed. SMX removal efficiency, energy consumption, mineralization efficiency and mineralization current efficiency could reach at 82.0%, 13.1kWh/m3, 34.2% and 0.7%, respectively, at the initial SMX concentration of 10mg/L, Na2SO4 concentration of 5mmol/L, current density of 5mA/cm2, and solution velocity of 27mL/min. The primary degradation mechanism of SMX was indirect oxidation, and the contribution efficiencies of ·OH and were 76.2% and 5.8%, respectively. The dominant degradation pathways were hydroxylation, N-S bond cleavage, oxidation and coupling reactions. The device exhibited good stability during the long-term treatment of both experimental and actual wastewaters, with SMX degradation efficiency, TOC removal efficiency, and COD removal efficiency in actual wastewater reaching 100%, 19.8%, and 72.2%, respectively. The electrocatalytic oxidation device effectively degraded SMX, and it also reduced the toxicity. Therefore, the continuous baffled flow electrocatalytic oxidation device based on the porous Ti4O7 electrode can effectively eliminate SMX from wastewater.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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