Deng Dongmei, Huang Ting, Li Qing, Huang Yongchun, Sun Yufei, Liang Jieliang, Li Jintian
Guangxi Key Laboratory of Green Processing of Sugar Resources, College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China.
Institute of Ecological Science, Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University, Guangzhou 510631, China.
Molecules. 2024 Feb 28;29(5):1057. doi: 10.3390/molecules29051057.
Effective and economical processes for the advanced treatment of coking wastewater were urgently needed to reduce the persistent organic pollutants of external drainage. In the present work, we investigated the degradation of organic pollutants in coking wastewater through IHC/FO (imping stream hydrodynamic cavitation (IHC) coupled with the Fenton oxidation (FO) process) and IHC alone for their feasibility in the advanced treatment of coking wastewater. To select the optimum parameters, attention was paid to the effects of main operation conditions including inlet fluid pressure, medium temperature, initial pH, reaction time, and initial Fe(II) and initial HO concentrations. The results showed that the effects of conditions that need energy to be maintained (such as initial pH and inlet pressure) on the organic pollutant removal efficiency through IHC/FO were less pronounced than those through IHC alone. Moreover, the application of IHC/FO could remove more organic pollutants from coking wastewater than IHC even at an energy-efficient condition. For example, the highest COD removal efficiency of 12.5% was achieved in the IHC treatment at 0.4 MPa, pH 3, and 60 min for the reaction time. In the case of IHC/FO, the maximum COD removal of 33.2% was obtained at pH 7, 0.1 MPa, 12 mmol/L HO, and 3 mmol/L Fe after reacting for 15 min. The ultraviolet and visible spectrophotometry (UV-Vis) absorption spectra and gas chromatography and mass spectrometry (GC-MS) analysis further revealed that the kinds and amounts of pollutants (especially those that had benzenes) remaining in water treated through IHC/FO were much fewer and smaller than in water treated through IHC alone. The better performances of IHC/FO than IHC alone were likely related to the more hydroxyl radicals produced through IHC/FO. Taken together, our findings indicate that IHC/FO has great application potential in the advanced treatment of coking wastewater.
迫切需要有效且经济的工艺来深度处理焦化废水，以减少外排水中的持久性有机污染物。在本研究中，我们研究了通过冲击流液力空化（IHC）与芬顿氧化（FO）工艺耦合（IHC/FO）以及单独使用IHC来降解焦化废水中有机污染物的方法，以评估它们在焦化废水深度处理中的可行性。为了选择最佳参数，重点关注了主要操作条件的影响，包括入口流体压力、介质温度、初始pH值、反应时间以及初始Fe(II)和初始HO浓度。结果表明，对于通过IHC/FO去除有机污染物的效率而言，需要能量维持的条件（如初始pH值和入口压力）的影响不如单独使用IHC时明显。此外，即使在节能条件下，IHC/FO对焦化废水中有机污染物的去除也比IHC更多。例如，在IHC处理中，当压力为0.4MPa、pH值为3、反应时间为60分钟时，COD去除效率最高可达12.5%。在IHC/FO的情况下，反应15分钟后，在pH值为7、压力为0.1MPa、HO浓度为12mmol/L、Fe浓度为3mmol/L时，COD最大去除率为33.2%。紫外可见分光光度法（UV-Vis）吸收光谱以及气相色谱-质谱联用（GC-MS）分析进一步表明，通过IHC/FO处理的水中残留的污染物种类和数量（尤其是含有苯环的污染物）比单独通过IHC处理的水少得多且含量更小。IHC/FO比单独使用IHC表现更好，这可能与IHC/FO产生更多的羟基自由基有关。综上所述，我们的研究结果表明，IHC/FO在焦化废水深度处理中具有巨大的应用潜力。
