PDF
Full
Outline
This study implemented an integrated precipitation-air stripping-electrochemical oxidation process to treat limestone wet desulfurization wastewater, systematically investigating the effects of operational parameters on chloride removal, nitrogen elimination, and organic pollutant degradation. The removal mechanisms of multiple contaminants were comprehensively elucidated. Through response surface methodology (RSM) optimization, the salt precipitation achieved 66.9% chloride ion removal efficiency under optimal conditions (Ca/Al/Cl molar ratio of 6.8:1.9:1, operational temperature 37.5℃). Air stripping was conducted under alkaline condition, which attained 76.5% ammonia nitrogen removal efficiency. Finally, after 180min electrochemical oxidation, the effluent ammonia nitrogen and COD concentrations were significantly reduced to 7mg/Land 165mg/L, respectively. Mechanistic analysis revealed that the introduction of calcium-aluminum salts facilitated the transformation of tetrahedral Al(OH)4- into Ca-O-Al octahedral under high Ca/Al ratios and appropriate thermal conditions. Cl- were immobilized through adsorption or ion exchange by calcium-aluminum bimetallic layered hydroxide, then the Ca4Al2(OH)12Cl2•10H2O was formed and precipitated from the water. After precipitation-air stripping process, the residual Cl- concentration in the effluent was high, enabling its participation in electrochemical activation, and generating reactive species such as •Cl, •OH and 1O2, Thus those pollutants such as ammonia nitrogen and organic matters in the effluent was efficiently purified by direct anodic oxidation and indirect oxidation of active substances.
PDF
72
32
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
