NaHSO3和KMnO4组合可渗透反应栅对苯胺的去除特性

采用亚硫酸氢钠（NaHSO₃）强化高锰酸钾（KMnO₄）去除苯胺（AN）.通过批次处理实验研究了AN去除率与反应条件的关系，分析了KMnO₄投加量、NaHSO₃投加量、初始pH值和反应时间之间的交互作用；以石蜡为胶结剂分别制备基于NaHSO₃和KMnO₄的可渗透反应栅（PRB），对模拟AN污染地下水进行连续处理，研究不同PRB的释放规律和组合PRB对AN的去除特性.结果表明，NaHSO₃可显著强化KMnO₄对AN的降解速率，当AN初始浓度为5mg/L，NaHSO₃/KMnO₄/AN为5/5/1时，AN去除率达99.2%，高于单独KMnO₄处理的85.6%.AN去除率与KMnO₄投加量、NaHSO₃投加量和反应时间线性正相关，与溶液初始pH值线性负相关.采用二次多项式和逐步回归法拟合了AN去除率与反应条件间的关系，模拟值与验证实验结果相近，模型精度较好.PRB中NaHSO₃溶出速率显著大于KMnO₄.当NaHSO₃和KMnO₄混合的可渗透反应栅（SB/PM-PRB）质量为5g，进水流速和AN浓度分别为0.1mL/min和10mg/L时，168h内AN的去除率保持在99%以上，且克服了KMnO₄单独处理出水色度过高的问题.傅里叶变换红外光谱分析表明，反应前后PRB成分没有显著变化，PRB稳定性较好.紫外光谱扫描结果表明，AN和苯环特征峰强度均显著下降，表明SB/PM-PRB能使AN开环降解和破坏氨基结构.

Characteristics of aniline removal using composite permeable reaction barrier based on NaHSO3 and KMnO4

Sodium bisulfite (NaHSO₃) was used to enhance the removal of aniline (AN) by potassium permanganate (KMnO₄). The relationship between AN removal rate and reaction conditions was studied through batch experiments, and the interaction between KMnO₄ dosage, NaHSO₃ dosage, initial pH, and reaction time was analyzed. The permeable reactive barrier (PRB) based on NaHSO₃ and KMnO₄ was prepared using paraffin as cementation agent for continuous treatment of simulated AN contaminated groundwater, and the release law of different PRBs and the removal characteristics of AN by PRBs were analyzed. The results showed that NaHSO₃ could significantly enhance the degradation rate of AN by KMnO₄. When the initial AN concentration was 5mg/L and NaHSO₃/KMnO₄/AN was 5/5/1, the AN removal rate reached 99.2%, which was higher than 85.6% treated with KMnO₄ alone. The AN removal rate was linearly positively correlated with the dosage of KMnO₄, the dosage of NaHSO₃ and the reaction time, and linearly negatively correlated with the initial pH of solution. A quadratic polynomial and stepwise regression method were used to fit the relationship between the AN removal rate and the reaction conditions. The simulated values were similar to the verification experimental results, indicating that the model accuracy was good. The dissolution rate of NaHSO₃ in PRB was significantly higher than that of KMnO₄. When the mass of SB/PM-PRB was 5g, the influent flow rate and AN concentration were 0.1mL/min and 10mg/L, respectively, the removal rate of AN remained above 99% within 168h. In addition, it overcame the problem of excessively high chroma when using KMnO₄ alone. Fourier transform infrared spectroscopy analysis showed that the PRB components did not change significantly before and after the reaction, indicating that the stability was good. The results of UV-vis scanning showed that the intensity of the characteristic peaks of AN and benzene ring decreased significantly, indicating that SB/PM-PRB can open the benzene ring and destroy the amino structure of AN.