内循环流化床—臭氧催化氧化处理石化废水二级出水  

Internal Circulating Fluidized Bed-Ozone Catalytic Oxidation Process for Treatment of Petrochemical Secondary Effluent

作　　者：赵檬 王盼新 宁超 吴昌永[1,2] ZHAO Meng;WANG Pan-xin;NING Chao;WU Chang-yong(Research Center of Water Pollution Control Technology,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;State Key Laboratory of Environmental Criteria and Rish Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Public Engineering Department of Daqing Refining and Chemical Company,Daqing 16341l,China)

机构地区：[1]中国环境科学研究院环境污染控制工程技术研究中心,北京100012 [2]中国环境科学研究院环境标准与风险评估国家重点实验室,北京100012 [3]大庆炼化公司公用工程部,黑龙江大庆163411

出　　处：《中国给水排水》2023年第1期26-33,共8页China Water & Wastewater

基　　金：国家重点研发计划项目(2020YFC1806302-03)。

摘　　要：采用内循环流化床-臭氧催化氧化工艺深度处理石化废水二级出水,通过单因素实验确定了该工艺的最佳运行条件,并在该条件下对臭氧催化氧化流化床与固定床工艺进行了效果对比。结果表明,流化床工艺能够更高效地降解石化废水中的有机物,在催化剂投加量为40 g/L、臭氧投加量为75 mg/(L·h)、反应时间为1 h的条件下,流化床工艺的TOC去除率为46.47%,臭氧利用率为68%,固定床工艺的TOC去除率为21.73%,臭氧利用率为39.8%;达到相同TOC去除效果时,流化床工艺所需催化剂投加量仅为固定床工艺的1/10。流化床催化剂1 h内可以吸附石化废水中30.23%的TOC,相同投量的固定床催化剂对TOC的吸附效果不明显。重复实验结果表明,臭氧催化氧化是流化床工艺去除污染物的主要途径。三维荧光光谱和UV254分析显示,相同条件下流化床工艺将臭氧转化为活性自由基的能力强于固定床工艺。内循环流化床-臭氧催化氧化工艺可大量减少催化剂使用量,提高臭氧利用率,降低废水处理成本,且效果稳定。An internal circulating fluidized bed-ozone catalytic oxidation process was used to treat the secondary effluent of petrochemical wastewater. The optimal operating conditions of the process were determined by single-factor experiments, and the effects of the ozone catalytic oxidation fluidized bed process were compared with the fixed bed process under the optimal operation conditions. The results showed that the fluidized bed process could more effectively degrade organic matter in petrochemical wastewater. Under the conditions of 40 g/L of catalyst dosage, 75 mg/(L·h) of ozone dosage and 1 h of reaction time, the TOC removal rate of the fluidized bed process was 46.47% and ozone utilization rate was 68%, while the corresponding values for the fixed bed process were only 21.73% and 39.8%,respectively. The catalyst dosage required to achieve the same TOC removal effect in fluidized bed process was only 1/10 of that in fixed bed process. The fluidized bed catalyst could adsorb 30.23% of TOC in the petrochemical wastewater within 1 h, and the fixed bed catalyst with the same dosage had no obvious adsorption effect on the TOC in the wastewater. Repeated experimental results indicated that ozone catalytic oxidation was the main way to remove pollutants by fluidized bed process. The results of three-dimensional fluorescence spectrum and UV254 analysis indicated that under the same conditions, the fluidized bed process had a stronger ability to catalyze ozone into active radicals than that of fixed bed process. The internal circulating fluidized bed-ozone catalytic oxidation process can substantially reduce the amount of catalyst, improve the ozone utilization efficiency, reduce the cost of wastewater treatment,and the treatment effect is stable.

关 键 词：内循环流化床 臭氧催化氧化 石化废水 吸附 三维荧光光谱 

分 类 号：TU992[建筑科学—市政工程]