Removing ammonia-nitrogen (NH₃N) from wastewater is of paramount importance for wastewater treatment. In this study, a novel continuous liquid plasma process (CLPD) was evaluated to remove NH₃N from synthetic wastewater. The Box–Behnken experimental design was used to optimize the main process parameters, including the initial NH₃N concentration (50–200 mg/L), power input (150–300 W), and gas-flow rate (1.5–2.5 L/min), for efficient NH₃N removal from wastewater. The gas-flow rate and power input were found to be significant factors affecting the removal efficiency of NH₃N, whereas the initial concentration of NH₃N played a vital role in determining the energy efficiency of the process. Under the optimal conditions of an initial NH₃N concentration of 200 mg/L, applied power of 223 W, and gas-flow rate of 2.4 L/min, 98.91% of NH₃N could be removed with a N₂ selectivity of 92.91%, and the corresponding energy efficiency was 0.527 g/kWh after 2 hrs of treatment. A small fraction of undesirable NO₃⁻-N (7.05 mg/L) and NO₂⁻-N (2.83 mg/L) were also produced. Kinetic modeling revealed that NH₃N degradation by the CLPD followed a pseudo-first-order reaction model, with a rate constant (k) of 0.03522 min⁻¹. Optical emission spectroscopy (OES) was used to gather information about the active chemical species produced during the plasma discharge. The obtained spectra revealed the presence of several highly oxidative radicals, including ‧OH, ‧O, and ‧O₂⁺. These results demonstrate the potential of liquid phase plasma discharge as a highly efficient technology for removing ammonia from aqueous solutions.

从废水中去除氨氮（NH ₃ N）对于废水处理至关重要。在这项研究中，评估了一种新型连续液体等离子体工艺 (CLPD) 从合成废水中去除 NH ₃ N。Box-Behnken 实验设计用于优化主要工艺参数，包括初始 NH ₃ N 浓度（50-200 mg/L）、功率输入（150-300 W）和气体流速（1.5-2.5 L） /min)，用于从废水中有效去除 NH ₃ N。发现气体流量和功率输入是影响 NH _{3 N 去除效率的重要因素，而 NH 3}的初始浓度N 在确定过程的能源效率方面发挥了至关重要的作用。在初始NH ₃ N浓度为200 mg/L、外加功率为223 W、气体流量为2.4 L/min的最佳条件下，可去除98.91%的NH _{3 N，N 2}选择性为92.91 %，处理 2 小时后相应的能量效率为 0.527 g/kWh。还产生了一小部分不希望的 NO ₃ ^- -N (7.05 mg/L) 和 NO ₂ ^- -N (2.83 mg/L)。动力学模型显示，CLPD对NH ₃ N的降解遵循准一级反应模型，速率常数（k）为0.03522 min ^-1. 发射光谱 (OES) 用于收集有关等离子体放电过程中产生的活性化学物质的信息。获得的光谱表明存在几种高氧化自由基，包括‧OH、‧O和‧O 2 ₊ ^。这些结果证明了液相等离子体放电作为一种从水溶液中去除氨的高效技术的潜力。