机械搅拌铁碳微电解还原硝基苯废水

doi:10.11894/iwt.2020-0551

工业水处理 ›› 2021, Vol. 41 ›› Issue (4): 108-112. doi: 10.11894/iwt.2020-0551

机械搅拌铁碳微电解还原硝基苯废水

高亚娟¹(),汪林¹,张炜铭^1,²,赵昕¹,马信¹,唐凯¹,周宗远¹

1. 国家环境保护有机化工废水处理与资源化工程技术中心, 江苏南大环保科技有限公司, 江苏南京 210046
2. 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 江苏南京 210093

收稿日期:2021-03-13 出版日期:2021-04-20 发布日期:2021-04-23
作者简介:高亚娟(1987-), 硕士, 工程师。电话: 025-68568067, E-mail: 345291865@qq.com

Treatment of nitrobenzene wastewater by iron-carbon micro-electrolysis under mechanical agitation

Yajuan Gao¹(),Lin Wang¹,Weiming Zhang^1,²,Xin Zhao¹,Xin Ma¹,Kai Tang¹,Zongyuan Zhou¹

1. State Environmental Protection Engineering Center for Organic Chemical Industrial Wastewater Disposal and Resources Reuse, Jiangsu NJU Environment Protection Technology Co., Ltd., Nanjing 210046, China
2. School of Environment, Nanjing University, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing 210093, China

Received:2021-03-13 Online:2021-04-20 Published:2021-04-23

摘要/Abstract

摘要：

根据间歇实验、连续流实验、工程运行情况评估了机械搅拌方式下铁碳微电解还原硝基苯的效果及稳定性。结果表明：采用机械搅拌方式，硝基苯去除率可达到90%以上，较曝气搅拌方式提高了约10%。硝基苯的还原符合一级动力学，机械搅拌下反应速率常数为0.554 h^-1，是曝气搅拌反应速率的1.8倍。反应后废水ORP由690.3 mV稳定降至100 mV以下，达到水解酸化的适宜条件。工程运行中，机械搅拌方式下铁碳微电解单元硝基苯的去除率在88%~97%，去除效果稳定。

关键词: 铁碳微电解, 硝基苯, 机械搅拌

Abstract:

The reduction effect and stability under mechanical agitation on the nitrobenzene by iron-carbon microelectrolysis were evaluated via batch experiment, continuous flow tests and engineering operation. The results showed that the removal rate of nitrobenzene under mechanical agitation could reach more than 90%, which was 10% higher than that of aeration stirring method. The reduction of nitrobenzene met first-order kinetics. The rate constant under mechanical agitation was 0.554 h^-1, which was 1.8 times higher than that of aeration stirring. After the reaction, the wastewater ORP decreased from 690.3 mV to below 100 mV, which reached the suitable condition of the hydrolytic acidification. Engineering operation data showed that the removal rate of nitrobenzene reaches 88%-97% under mechanical agitation with stable removal effects.

Key words: iron-carbon micro-electrolysis, nitrobenzene, mechanical agitation

中图分类号:

X703

高亚娟,汪林,张炜铭,赵昕,马信,唐凯,周宗远. 机械搅拌铁碳微电解还原硝基苯废水[J]. 工业水处理, 2021, 41(4): 108-112.

Yajuan Gao,Lin Wang,Weiming Zhang,Xin Zhao,Xin Ma,Kai Tang,Zongyuan Zhou. Treatment of nitrobenzene wastewater by iron-carbon micro-electrolysis under mechanical agitation[J]. Industrial Water Treatment, 2021, 41(4): 108-112.

https://www.iwt.cn/CN/Y2021/V41/I4/108

图/表 5

图1 铁碳微电解还原硝基苯连续流实验装置
1-原水储罐；2-恒温水浴锅；3-计量泵；4-铁碳填料；5-铁碳微电解反应器；6-机械搅拌器；7-溢流堰；8-出水储罐

图2 搅拌方式对pH（a）、ORP（b）及硝基苯（c）的影响

图3 不同搅拌方式下硝基苯的去除效果（a）及动力学拟合方程（b）

图4 连续流实验pH（a）、ORP（b）及硝基苯（c）的变化曲线

图5 工程实施运行数据

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