摘要
研究者在苯胺模拟废水高级氧化处理方面开展了很多研究,但针对炼化企业苯胺装置废水含盐高、色度高、COD降解难等问题尚未开展工程应用。为解决苯胺生产废水的实际问题,本研究开展了TiO2/UV-H2O2氧化降解苯胺废水(1~2m^3/h)的现场试验研究。考察了苯胺废水在单独TiO2/UV、单独H2O2氧化及TiO2/UV-H2O2协同作用下的处理效果,提出了苯胺废水的最佳处理工艺方案,并进行了成本核算。结果表明,单独TiO2/UV和单独H2O2氧化对苯胺废水的脱色率和COD去除率偏低,而TiO2/UV-H2O2协同作用时苯胺废水脱色率和COD去除率可达95%以上。协同氧化体系中,H2O2的氧化降解作用显著,H2O2投加量1%~2%;酸性条件利于苯胺废水的降解,特别是p H=3.8~4.2时;TiO2/UV和H2O2协同作用一段时间后,停止UV而凭借残余H2O2可以将体系中的中间产物继续降解直至矿化成CO2。TiO2/UV-H2O2协同处理炼化企业苯胺生产废水,出水COD≤60mg/L,色度≤20倍,单位能耗约18.44kW·h/m^3,明显低于文献报道值,具有显著的技术性与经济性。
Advanced oxidation processes on aniline simulated wastewater treatment have received considerable studies to eliminate organic pollutants,but such techniques have rarely been employed to solve the problem of high salinity,high chromaticity and refractory COD of aniline wastewater in petrochemical enterprises.In this study,in situ degradation experiments(1—2m3/h)on aniline wastewater by TiO2/UV-H2O2 were carried out.The degradation effects of aniline wastewater were examined in TiO2/UV system,H2O2 oxidation system,and a combination system of TiO2/UV and H2O2.An optimal treatment process for aniline wastewater was proposed and its operational costs were also evaluated.It was observed that the application of TiO2/UV and H2O2 alone had relatively low decolorization rate and COD removal rate for aniline wastewater,whereas the decolorization rate and COD removal rate can reach over 95%by TiO2/UV-H2O2 synergistic oxidation.H2O2 contributes to a predominant oxidative degradation in the synergistic oxidation system with a common total dosage of 1%~2%.Acidic conditions favored the degradation of aniline-containing wastewater,especially pH=3.8~4.2.After a period of synergistic oxidation by TiO2/UV-H2O2,the UV light was turned off and the intermediate compounds in the system could be further mineralized to CO2 by residual H2O2.COD and chromaticity in the effluent were below 60mg/L and 20 times,respectively,and the operational cost was 18.44 kW·h/m3,much lower than the reported value.So,TiO2/UV-H2O2 seems to be significantly feasible and economical for the mineralization of aniline wastewater.
作者
张华
张子鹏
张澜澜
张晓飞
刘译阳
ZHANG Hua;ZHANG Zipeng;ZHANG Lanlan;ZHANG Xiaofei;LIU Yiying(CNPC Research Institute of Safety and Environmental Technology,Beijing 102206,China;CNPC Science&Technology Management Department,Beijing 100007,China;PETROCHINA Jilin Petrochemical Company Calcium Carbide Factory,Jilin 132022,Jilin,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2020年第12期5299-5308,共10页
Chemical Industry and Engineering Progress
基金
中国石油天然气集团有限公司安全环保关键技术研究与推广课题(2017D-4611)
中国石油天然气集团有限公司重点实验室课题(2019D-5006-62)
水体污染控制与治理科技重大专项(2017ZX07402-002-02)。
关键词
苯胺废水
UV催化
H2O2氧化
脱色
矿化
aniline wastewater
UV catalysis
H2O2 oxidation
decolorization
mineralization
