NaHSO3和KMnO4组合可渗透反应栅对苯胺的去除特性  

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

作　　者：叶倩 王城晨 王明新 韩莹 薛金娟 YE Qian;WANG Cheng-chen;WANG Ming-xin;HAN Ying;XUE Jin-juan(School of Environmental&Safety Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Engineering Research Center of Petrochemical Safety and Environmental Protection,Changzhou 213164,China)

机构地区：[1]常州大学环境与安全工程学院,江苏常州213164 [2]江苏省石油化工安全与环保工程研究中心,江苏常州213164

出　　处：《中国环境科学》2020年第7期2960-2969,共10页China Environmental Science

基　　金：国家自然科学基金项目(41772240,21906009);江苏省研究生科研与实践创新计划项目(SJCX19_0653)。

摘　　要：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Na HSO3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0.1m L/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.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 p H,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 PRBcomponents 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.

关 键 词：高锰酸钾 亚硫酸氢钠 响应面法 可渗透反应栅 

分 类 号：X703[环境科学与工程—环境工程]