电絮凝-气浮法处理高浓度硝基苯废水  

Treatment of high concentration nitrobenzene wastewater by electrocoagulation-flotation

作　　者：张洋 王宝山[1,2] 许亚兵 汪光宗 李鹏程 张继成 陈晓杰 赵培宇 ZHANG Yang;WANG Baoshan;XU Yabing;WANG Guangzong;LI Pengcheng;ZHANG Jicheng;CHEN Xiaojie;ZHAO Peiyu(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Yellow River Water Environment in Gansu Province,Lanzhou 730020,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]甘肃省黄河水环境重点实验室,甘肃兰州730020

出　　处：《工业水处理》2023年第10期79-87,共9页Industrial Water Treatment

基　　金：国家自然科学基金项目(51368029);2022年甘肃省高等学校产业支撑计划项目(2022CYZC-40)。

摘　　要：对兰州新区某化工厂高浓度硝基苯(NB)废水进行双铝电极电絮凝-气浮工艺处理,探讨了该工艺处理高浓度硝基苯废水的技术参数及硝基苯类有机物的降解过程。结果表明,在溶液初始pH为9、电流密度为10 mA/cm~2、极板间距为3 cm、反应时间为100 min时,硝基苯和COD的平均去除率分别为60.34%和12.10%。通过气相色谱-质谱联用仪(GC-MS)分析反应前后废水中特征污染物的降解情况,发现电絮凝-气浮工艺对原水中硝基苯类和苯酚类有机物有着显著的去除效果,主要产物为苯胺类和偶氮苯类。电絮凝-气浮工艺虽不能实现高浓度硝基苯废水COD的大幅降低,但可实现硝基苯类有机物向可生化性较好的苯胺类有机物的有效转化,改变废水的可生物降解性能,为后续进一步处理提供有利条件。The high concentration nitrobenzene (NB) wastewater from a chemical plant in Lanzhou New Area was treated by double aluminum electrocoagulation-flotation process.The technical parameters of the process for treating high concentration nitrobenzene wastewater and the degradation mechanism of nitrobenzene organics were discussed.The results showed that the average removal rates of nitrobenzene and COD were 60.34%and 12.10%respectively,with the condition of reaction time 100 min,the initial solution pH 9,the current density 10 mA/cm~2 and the plate spacing 3 cm.The degradation of organic pollutants such as nitrobenzene in wastewater before and after the reaction were analyzed by gas chromatography-mass spectrometry (GC-MS).It was found that the electrocoagulation-flotation process had obvious removal effect on nitrobenzene and phenol organics in raw water,and the main products were anilines and azobenzenes.Although the electrocoagulation-flotation process could not achieve a significant COD reduction of high-concentration nitrobenzene wastewater,it could realize the effective conversion of nitrobenzene organics to aniline organics with good biodegradability,change the biodegradability of wastewater,and provide favorable conditions for subsequent further treatment.

关 键 词：电絮凝-气浮工艺 硝基苯 苯胺 化工废水 

分 类 号：X703.1[环境科学与工程—环境工程]