高铁酸钾降解隧道施工废水中苯酚的效能研究

Study on the Efficiency of Potassium Ferrate in the Degradation of Phenol in Tunnel Construction Wastewater

采用高铁酸钾对两种隧道施工废水中的苯酚、COD、氨氮(NH3-N)进行去除,并分别研究高铁酸钾浓度、温度、pH、时间和苯酚浓度对苯酚去除效果的影响。采用纳氏比色法、分光光度法、高效液相色谱法对废水中的NH3-N、COD、苯酚浓度进行测定;通过设计砂柱实验,模拟真实的地下水环境系统下处理苯酚污染的地下水。结果表明:高铁酸钾去除含苯酚的隧道施工废水效果较好;施工废水中的苯酚降解随高铁酸钾的投加量增加而增加、随温度的升高而降低;施工废水中的苯酚降解在酸性条件下效果较好,随着pH的增加效果降低;同时,高铁酸钾对含苯酚的隧道施工废水中的COD、氨氮(NH3-N)去除也有一定效果。通过淬灭实验探究反应当中的产生的自由基类别。

Potassium ferrate was used to remove phenol,COD and ammonia nitrogen(NH3-N)from two kinds of tunnel construction wastewater.And the effects of potassium ferrate concentration,temperature,pH,time,and phenol concentration on the phenol removal effect were studied.The concentrations of ammonia nitrogen(NH3-N),COD,and phenol in wastewater were determined by Nassl colorimetric method,spectrophotometry,and high-performance liquid chromatography.A sand column test was designed to simulate the treatment of phenol-contaminated groundwater in a real groundwater environment system.The results showed that the potassium ferrate has a good effect on removing the tunnel construction wastewater containing phenol.The degradation of phenol in construction wastewater increased with the increase of potassium ferrate dosage and decreased with the increase of temperature.The degradation effect of phenol in construction wastewater is good under acidic conditions,but decreases with the increase of pH.At the same time,potassium ferrate has a certain effect on the removal of COD and ammonia nitrogen(NH3-N)in tunnel construction wastewater containing phenol.The type of free radicals produced in the reaction was investigated by quenching experiment and electron paramagnetic resonance characterization.