College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China.
College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China; Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, China.
J Environ Manage. 2021 Oct 1;295:112933. doi: 10.1016/j.jenvman.2021.112933. Epub 2021 Jun 18.
In this study, the carbon black/polytetrafluoroethylene (C/PTFE) electrode was prepared under the best conditions, and then it was modified by PTFE and NHHCO to make a PTFE-C/PTFE electrode. PTFE-C/PTFE electrode was used to enhance HO in-situ electro-generation and the electro-peroxone process (EPP) treatment of leachate. Various analytical methods results were applied to prove that the PTFE-C/PTFE electrode greatly improved the performance of HO generation and electrode stability. The effects of initial pH, current intensity, ozone flow and Cl concentration on the removal of NH and chemical oxygen demand (COD) from landfill leachate were studied in the EPP with PTFE-C/PTFE as cathode (MEPP) by one factor at a time (OFAT) method. The initial pH value 7.5, current intensity 300 mA, ozone flow 875 mg/h and Cl concentration value 4198 mg/L were selected as the best operating parameters. A response surface methodology based on box-behnken design (BBD) was employed to optimize running conditions of the MEPP of leachate. After optimization, Mineralization efficiency of the NH and COD was obtained to be 79.83% and 52.14%, and biochemical oxygen demand (BOD)/COD ratio increased to 0.38 after 4 h. The removal curves of NH and COD in the MEPP conforms to the zero-order and first-order reaction kinetics, respectively. Three-dimensional excitation-emission matrix fluorescence spectroscopy (3D-EEM) analysis shows that MEPP has a good removal effect on organics in leachate. Energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis were carried out for the cathode sediment, which was mainly magnesium ion silicate precipitation and NaCl.
在本研究中，在最佳条件下制备了碳黑/聚四氟乙烯（C/PTFE）电极，然后用 PTFE 和 NHHCO 对其进行修饰，得到了 PTFE-C/PTFE 电极。PTFE-C/PTFE 电极用于增强 HO 的原位电生成和电过氧单胞过程（EPP）处理渗滤液。各种分析方法的结果都证明了 PTFE-C/PTFE 电极极大地提高了 HO 生成和电极稳定性的性能。通过单因素实验（OFAT）法研究了初始 pH 值、电流强度、臭氧流量和 Cl 浓度对以 PTFE-C/PTFE 为阴极（MEPP）的 EPP 中渗滤液中 NH 和化学需氧量（COD）去除的影响。选择初始 pH 值 7.5、电流强度 300 mA、臭氧流量 875 mg/h 和 Cl 浓度值 4198 mg/L 作为最佳操作参数。采用基于 Box-Behnken 设计（BBD）的响应面法优化 MEPP 运行条件。优化后，NH 和 COD 的矿化效率分别达到 79.83%和 52.14%，BOD/COD 比在 4 h 后提高到 0.38。MEPP 中 NH 和 COD 的去除曲线分别符合零级和一级反应动力学。三维激发-发射矩阵荧光光谱（3D-EEM）分析表明，MEPP 对渗滤液中的有机物具有良好的去除效果。对阴极沉积物进行了能谱（EDS）和 X 射线衍射（XRD）分析，主要为硅酸镁沉淀和 NaCl。
