Soil Environment Research Center, Department of Environmental Engineering, Division of Civil, Environmental, Mineral Resource and Energy Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Korea.
Department of Environment and Energy, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Korea.
Int J Environ Res Public Health. 2020 Oct 21;17(20):7694. doi: 10.3390/ijerph17207694.
This study investigates how the non-thermal plasma (NTP) process leads to advanced oxidation of sewage using response surface methodology. For environmentally viable and efficient operation of the NTP process, temperature and contact time were selected as two important independent variables. Their impacts on the performance were tested following an experimental design to figure out optimal operating conditions. Based on obtained treatment efficiency, statistically optimized conditions were derived by using an approach adapting the central composite design. Results show that coupling 40 °C of temperature and 4 h of contact time demonstrate optimal performance for total chemical oxygen demand (TCOD, 59%) and total suspended solids (85%), respectively. This implies that NTP may present efficient particulate destruction leading to organic solids dissolution. Statistical analysis reveals that the contact time shows more significant dependency than the temperature on the advanced oxidation of TCOD, possibly due to dissolved organic material. For total nitrogen removal, on the contrary, the optimal efficiency was strongly related to the higher temperature (~68 °C). This work provides an inroad to considering how NTP can optimally contribute to better oxidation of multiple pollutants.
本研究采用响应面法探讨了非热等离子体（NTP）工艺如何导致污水的高级氧化。为了使 NTP 工艺在环境上可行且高效运行，选择温度和接触时间作为两个重要的独立变量。根据实验设计测试它们对性能的影响，以确定最佳操作条件。根据获得的处理效率，通过采用适应中心复合设计的方法，推导出统计学优化条件。结果表明，40°C 的温度和 4 小时的接触时间分别对总化学需氧量（TCOD，59%）和总悬浮固体（TSS，85%）的表现达到最佳。这表明 NTP 可能具有有效的颗粒破坏作用，导致有机固体溶解。统计分析表明，接触时间对 TCOD 的高级氧化的依赖性比温度更显著，这可能是由于溶解的有机物质。对于总氮去除，相反，最佳效率与更高的温度（~68°C）密切相关。这项工作为考虑 NTP 如何能够最佳地促进多种污染物的更好氧化提供了一个切入点。
