废铁屑-Ti(RuO_(2))三维电极高效处理高氮磷低C/N污水  

High-nitrogen/phosphorus and low-C/N sewage treatment by iron-scarps and Ti(RuO_(2))based three-dimension electrode

作　　者：丁红[1] 王艺洁[1] 武福平[2] DING Hong;WANG Yijie;WU Fuping(Bowen College,Lanzhou Jiaotong University,Lanzhou 730101,China;School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学博文学院,兰州730101 [2]兰州交通大学环境与市政工程学院,兰州730070

出　　处：《环境工程学报》2021年第3期847-856,共10页Chinese Journal of Environmental Engineering

基　　金：甘肃省教育厅2020年高等学校创新基金项目(2020A-184)。

摘　　要：高氮磷、低C/N比污水愈发常见,其处理技术的开发具有重要意义。利用废铁屑构建废铁屑-Ti(RuO_(2))三维电极,处理实际高氮磷、低C/N比污水。探讨了铁屑填充率、反应时间和槽电压对电氧化效率的影响及Cl^(-)对NH_(4)^(+)-N氧化的催化作用,并进行了动力学分析。结果表明:30%体积的铁屑可将COD、NH_(4)^(+)-N、TN和TP去除率分别提高19.9%、31.8%、41.3%和79.8%;铁屑的投加提高了电氧化效率,同时PO_(4)^(3-)与Fe^(3+)沉淀而被去除;最佳反应时间和槽电压分别为80 min和10 V;Cl^(-)的投加促进了Cl_(2)和HClO的生成,进而将NH_(4)^(+)-N直接氧化为N2,大幅降低了NO_(3)^(-)-N和NO_(2)^(-)-N积累;在Cl^(-)与NH_(4)^(+)的最佳摩尔比4∶1时,TN去除速率常数由0.27 min^(-1)增至0.69 min^(-1),此时,NH_(4)^(+)-N、TN和TP的去除率分别达96.8%、93.4%和98.1%。以上研究结果可为高氮磷、低C/N污水的快速处理提供参考。The high nitrogen/phosphorus and low C/N ratio sewage is more and more common,the development of the corresponding treatment technology is of significant importance.In this study,iron-scrap was used to set up the iron-scarp(IS)based Ti(RuO_(2))-three-dimension electrode(IS-TDE)for the practical high nitrogen/phosphorus and low C/N ratio sewage treatment.The impacts of IS dosage,reaction time and cell voltage on electric oxidation efficiency were investigated,as well as the catalytic effect of Cl^(-)on NH_(4)^(+)-N oxidation.The kinetics was also analyzed.The addition of IS at volume ratio of 30%could improve the removal rates of NH_(4)^(+)-N,TN and TP by 31.8%,41.3%and 79.8%,respectively.The addition of IS improved the efficiency of electro-oxidation of IS-TDE and PO_(4)^(3-)precipitation with Fe^(3+)occurred.The optimal react time and cell voltage were 80 min and 10 V,respectively.Cl^(-)addition initiated the production of Cl_(2)and HClO in ISTDE which oxidized NH_(4)^(+)-N into N2,and significantly reduced NO_(3)^(-)-N and NO_(2)^(-)-N accumulation.When the optimal molar ratio of Cl^(-)and NH_(4)^(+)-N was 4,TN removal rate constant(k)increased from 0.27 min^(-1)to0.69 min^(-1).The removal rates of NH_(4)^(+)-N,TN and TP were 96.8%,93.4%and 98.1%,respectively.The present research provided a theoretic basis and technical support for efficient treatment of high nitrogen/phosphorus and low C/N ratio sewage.

关 键 词：废铁屑-Ti(RuO_(2))三维电极 低碳氮比(C/N)污水 氯离子(Cl^(-)) 脱氮除磷 动力学 

分 类 号：X703.1[环境科学与工程—环境工程]