摘要
针对焦化废水生物处理后COD难于达标排放的问题,以焦化废水生化出水为对象,对微波强化Fenton技术(频率915 MHz)的深度处理效果和反应机理进行了探讨。结果表明:在Fe2+和H2O2投加量分别为1.8 mmol·L-1和15.6 mmol·L-1条件下,Fenton处理方法对COD的最佳去除率仅为18%,利用微波强化Fenton技术对COD的去除率可提升到77%,出水COD可降至52 mg·L-1,满足《炼焦化学工业污染物排放标准》;通过比较Fenton和微波强化Fenton反应出水过滤后的COD,发现Fenton反应对COD的去除率可由18%提升至72%,表明泥相可进一步吸附部分COD;而微波强化Fenton反应的COD去除率仅略微提高至81%,表明氧化是微波强化Fenton反应的主要作用机理,这可能与微波辐射通过热效应或非热效应可加快羟基自由基的生成、从而提高了氧化反应效率有关。以上结果表明,微波强化Fenton反应是焦化废水达标排放的一种可供选择的技术,可为目前我国焦化废水处理和达标排放处理技术的选择提供借鉴。
Conventional biological treatment of coking wastewater is still hardly meet the COD discharge standard, thus, for biochemical effluent of coking wastewater, the advanced treatment effect and reaction mechanism of microwave-enhanced Fenton technology(915 MHz) were discussed in this paper. The results showed that at Fe2+ dosage of 1.8 mmol·L-1 and H2O2 dosage of 15.6 mmol·L-1, the best COD removal efficiency by Fenton treatment was only 18%, while the COD removal efficiency by microwave-enhanced Fenton technology increased up to 77%, and COD in effluent decreased to 52 mg·L-1, which could meet the pollutants discharge standards in coking chemical industry. By comparing the COD values in the filtered effluents between Fenton and microwave enhanced Fenton reaction, the COD removal efficiency by Fenton reaction could increase from 18% to 72%, which indicated that the sludge phase could further adsorb part of COD. The COD removal efficiency by microwave enhanced Fenton reaction slightly increased to 81%,indicating that oxidation was the main mechanism of microwave enhanced Fenton reaction, which may be related to the acceleration of hydroxyl radical generation through thermal or non-thermal effects of microwave radiation enhancement, and the improvement of the oxidation reaction efficiency. This study shows that microwave enhanced Fenton is an alternative technology for the coking wastewater discharge below the standard, provides reference for the technology selection to treat the coking wastewater and discharge below the standard.
作者
张恒
李淑敏
刘媛
于建伟
高迎新
宋金成
虞彤
杨敏
ZHANG Heng;LI Shumin;LIU Yuan;YU Jianwei;GAO Yingxin;SONG Jincheng;YU Tong;YANG Min(Sino-Danish College,University of Chinese Academy of Sciences,Beijing 101400,China;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China 3.University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Qiyuanhuitong Water Technology Co.Ltd.,Beijing 102600,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第6期1495-1502,共8页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金重大项目(21590814)。
关键词
焦化废水
微波辐射
微波强化Fenton
氧化
吸附
coking wastewater
microwave radiation
microwave-enhanced Fenton
oxidation
adsorption