工业水处理 ›› 2023, Vol. 43 ›› Issue (10): 79-87. doi: 10.19965/j.cnki.iwt.2022-1069

• 试验研究 • 上一篇    下一篇

电絮凝-气浮法处理高浓度硝基苯废水

张洋1,2(), 王宝山1,2(), 许亚兵1,2, 汪光宗1,2, 李鹏程1,2, 张继成1,2, 陈晓杰1,2, 赵培宇1,2   

  1. 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
  • 收稿日期:2023-08-02 出版日期:2023-10-20 发布日期:2023-10-18
  • 作者简介:

    张洋(1998— ),硕士。电话:13772516913,E-mail:

    王宝山,博士,副教授。电话:13919126540,E-mail:

  • 基金资助:
    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)

Treatment of high concentration nitrobenzene wastewater by electrocoagulation-flotation

Yang ZHANG1,2(), Baoshan WANG1,2(), Yabing XU1,2, Guangzong WANG1,2, Pengcheng LI1,2, Jicheng ZHANG1,2, Xiaojie CHEN1,2, Peiyu ZHAO1,2   

  1. 1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
    2. Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730020, China
  • Received:2023-08-02 Online:2023-10-20 Published:2023-10-18

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/cm2、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。

关键词: 电絮凝-气浮工艺, 硝基苯, 苯胺, 化工废水

Abstract:

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 CODwere 60.34% and 12.10% respectively,with the condition of reaction time 100 min,the initial solution pH 9,the current density 10 mA/cm2 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.

Key words: electrocoagulation-flotation, nitrobenzene, aniline, chemical wastewater

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