Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China; School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
J Environ Sci (China). 2024 Dec;146:149-162. doi: 10.1016/j.jes.2023.06.034. Epub 2023 Jul 6.
Industrial wastewater should be treated with caution due to its potential environmental risks. In this study, a polymerization-based cathode/Fe/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, Fe 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, 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.
工业废水因其潜在的环境风险应谨慎处理。在这项研究中，首次采用基于聚合的阴极/Fe/过一硫酸盐（PDS）工艺处理未经处理的焦化废水，该工艺可通过将有机污染物转化为可分离的固体有机聚合物来实现有机物的同时去除和回收。结果表明，焦化废水中的几种主要有机污染物，如苯酚、甲酚、喹啉和吲哚，可以通过自偶联或交叉偶联诱导聚合。焦化废水中总化学需氧量（COD）的去除率为 46.8%，由有机污染物形成的可分离有机聚合物占去除 COD 的 62.8%。与传统的基于降解的工艺相比，可实现 41.9%的溶解有机碳（DOC）去除，过一硫酸盐的消耗量减少约 89%。PDS 浓度、Fe 浓度和电流密度等操作条件可以通过调节活性自由基的生成来影响 COD/DOC 的去除率和有机聚合物的产率。ESI-MS 结果表明，一些有机聚合物被无机离子如 Cl、Br、I、NH、SCN 和 CN 取代，这表明这些无机离子可能参与聚合反应。该焦化废水处理的比电耗为 27 kWh/kg COD 和 95 kWh/kg DOC。这些值远低于处理相同焦化废水的基于降解的工艺的数值，也低于以前报道的大多数用于处理焦化废水的工艺的数值。
