摘要
甲苯二胺生产废水具有强毒性、难降解、高污染特征,含硝基苯类、甲苯二胺、高浓度氨氮等污染物,对生态环境、人体健康及生产安全构成多维度威胁。为实现该类废水达标排放,以某甲苯二胺生产企业废水为研究对象,采用“两级低温沉降-调节池-低温湿式催化氧化-水解酸化-两级A/O”组合工艺进行处理。通过工程设计与实际运行监测,结果表明:两级低温沉降对硝基苯类物质回收率达88%,湿式催化氧化工段COD去除率87.5%,最终经生化系统深度处理后,出水COD、氨氮、硝基苯、苯胺浓度分别降至78mg/L、9mg/L、0.6mg/L、0.1mg/L,排放水质符合《污水综合排放标准》(GB8978-1996)中的一级标准要求。该工艺吨水运行成本19.8元,且实现硝基苯资源化回收,兼顾环境效益与经济效益。本工程案例为同类高浓度难降解有机化工废水的处理提供了切实可行的工程参考。
Wastewater from the production of toluene diamine is characterized by strong toxicity,difficult degradation,and high pollution.It contains pollutants such as nitrobenzene,toluene diamine,and high concentration ammonia nitrogen,posing a multidimensional threat to the ecological environment,human health,and production safety.To achieve the standard discharge of this type of wastewater,the wastewater from a certain toluene diamine production enterprise was taken as the research object,and a combination process of"two-stage low-temperature settling regulating tank low-temperature wet catalytic oxidation hydrolysis acidification two-stage A/O"was adopted for treatment.Through engineering design and actual operation monitoring,the results show that the two-stage low-temperature settling achieves a recovery rate of 88%for nitrobenzene substances,and the COD removal rate in the wet catalytic oxidation section is 87.5%.After deep treatment by the biochemical system,the effluent COD,ammonia nitrogen,nitrobenzene,and aniline concentrations are reduced to 78mg/L,9mg/L,0.6mg/L,and 0.1mg/L,respectively.The discharge water quality meets the first level standard requirements of the Comprehensive Wastewater Discharge Standard(GB8978-1996).The operating cost per ton of water for this process is 19.8 Yuan,and it achieves the resource recovery of nitrobenzene,balancing environmental and economic benefits.This project case provides a practical and feasible engineering reference for the treatment of similar high concentration and difficult to degrade organic chemical wastewater.
作者
张文晶
刘寅阁
朱倩
ZHANG Wenjing;LIU Yinge;ZHU Qian(Tianjin Gaoneng Era Water Treatment Technology Co.,Ltd.,Tianjin,300000,China;Beijing GeoEnviron Engineering&Technology,Inc,Beijing,100000,China)
出处
《工程建设(维泽科技)》
2025年第10期113-116,共4页
Engineering Construction
关键词
甲苯二胺
废水处理
硝基苯回收
低温湿式催化氧化
toluene diamine
wastewater treatment
nitrobenzene recovery
low temperature wet catalytic oxidation
