臭氧催化氧化技术深度处理印染废水的研究
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摘要
为了提高臭氧催化氧化技术在印染废水深度处理中的去除效率,提高催化剂的使用寿命,本研究利用混合法自制非均相催化剂,并考察了其在深度降解印染废水中橙黄G的应用.对废水初始pH、催化剂的投加量和臭氧投放速率3个过程参数进行了优化.研究结果表明,臭氧催化氧化降解橙黄G废水的最佳工艺参数是废水初始pH6～7、反应时间60 min,催化剂的投加量为300 g/L、臭氧投放速率为1.60 mg/(L·min).利用该工艺参数对某印染厂二沉池出水进行深度处理,60 min后出水COD为58.7 mg/L,COD去除率为67.4%,出水COD已经达到国家排放标准(GB18918—2002)的一级B标准.臭氧催化氧化降解橙黄G的过程符合一级反应动力学模型,反应速率常数随废水pH、臭氧投放速率及催化剂投加量的变化规律与单因素实验结果相吻合.
In order to improve the removal efficiency of ozone catalytic oxidation technology,as well as to prolong the service life of catalyst in advanced treatment of printing and dyeing wastewater,heterogeneous catalysts were prepared with a mixing method to enhance the degradation of orange G in printing and dyeing wastewater by ozone catalytic oxidation,and the parameters of initial pH,catalyst dosage,and ozone release rate were optimized. Results showed that the optimum process parameters for ozonation catalytic of orange G wastewater were an initial pH of 6-7,reaction time of 60 min,catalyst dosage of 300 g/L,and ozone release rate of 1.60 mg/(L·min). The effluent from the secondary clarifier of a printing and dyeing mill was treated under the optimum conditions. After after 60 min treatment,the COD of the effluent was 58.7 mg/L,and the removal rate of COD was 67.4%,which could meet the requirement of the national drainage standards for the first level of B standard for industrial wastewater(GB 18918—2002). The degradation of orange G by the ozone catalytic oxidation could be well described with the first order reaction kinetic model. The changes of reaction rate constants corresponding to pH,ozone dosage rate and the catalyst dosage were all well matched with the single-factor experiment.
In order to improve the removal efficiency of ozone catalytic oxidation technology,as well as to prolong the service life of catalyst in advanced treatment of printing and dyeing wastewater,heterogeneous catalysts were prepared with a mixing method to enhance the degradation of orange G in printing and dyeing wastewater by ozone catalytic oxidation,and the parameters of initial pH,catalyst dosage,and ozone release rate were optimized. Results showed that the optimum process parameters for ozonation catalytic of orange G wastewater were an initial pH of 6-7,reaction time of 60 min,catalyst dosage of 300 g/L,and ozone release rate of 1.60 mg/(L·min). The effluent from the secondary clarifier of a printing and dyeing mill was treated under the optimum conditions. After after 60 min treatment,the COD of the effluent was 58.7 mg/L,and the removal rate of COD was 67.4%,which could meet the requirement of the national drainage standards for the first level of B standard for industrial wastewater(GB 18918—2002). The degradation of orange G by the ozone catalytic oxidation could be well described with the first order reaction kinetic model. The changes of reaction rate constants corresponding to pH,ozone dosage rate and the catalyst dosage were all well matched with the single-factor experiment.
引文
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[2]高俊发.水环境工程学[M].北京:化学工业出版社,2003.
[3]刘伟京.印染废水深度降解工艺及工程应用研究[D].南京:南京理工大学,2013.
[4]金建华.生化/芬顿试剂氧化组合工艺处理印染废水试验研究[D].武汉:武汉理工大学,2012.
[5]蔡华,李克林,陈毅忠,等.活性炭催化臭氧氧化深度处理印染废水[J].常州大学学报:自然科学版,2010,22(3):38-41.
[6]黄仲涛,耿建铭.工业催化[J].2版.北京:化学工业出版社,2006.
[7]Khadhraoui M,Trabelsi H,Ksibi M,et al.Discoloration and detoxicification of a Congo red dye solution by means of ozone treatment for a possible water reuse[J].Journal of Hazardous Materials,2009,161(2):974-981.
[8]He Z Q,Lin L L,Song S,et al.Mineralization of C.I.Reactive Blue 19 by ozonation combined with sonolysis:Performance optimization and degradation mechanism[J].Separation and Purification Technology,2008,62(2):376-381.
[9]Zhang H,LüY J,Liu F,et al.Degradation of C.I.Acid Orange 7 by ultrasound enhanced ozonation in a rectangular air-lift reactor[J].Chemical Engineering Journal,2008,138(1):231-238.
[10]吴耀国,赵大为,焦剑,等.臭氧化的负载型非均相催化剂制备及其作用机理[J].材料导报,2005,19(10):8-11.
[11]洪浩峰,潘湛昌,徐阁,等.活性炭负载催化剂臭氧催化氧化处理印染废水研究[J].工业用水与废水,2010,41(3):29-33.
[12]袁淼卉.粉煤灰基催化剂催化臭氧氧化深度处理印染废水的研究[D].苏州:苏州科技学院,2012.
[13]Patnaik P.Handbook of Inorganic Chemicals[M].New York:Mc Graw-Hill,2003.
[14]He K,Dong Y,Yin L,et al.A facile hydrothermal method to synthesize nanosized Co3O4/CeO2 and study of its catalytic characteristic in catalytic ozonation of phenol[J].Catalysis Letters,2009,133(1/2):209.
[15]Qi F,Xu B,Chen Z,et al.Catalytic ozonation of 2-isopropyl-3-methoxypyrazine in water byγ-AlOOH andγ-Al2O3:Comparison of removal efficiency and mechanism[J].Chemical Engineering Journal,2013,219:527-536.
[16]张冉.非均相催化臭氧氧化深度处理煤化工废水[D].哈尔滨:哈尔滨工业大学,2011.
[17]Li W W,Qiang Z M,Zhang T,et al.Kinetics and mechanism of pyruvic acid degradation by ozone in the presence of PdO/CeO2[J].Applied Catalysis B:Environmental,2012,113:290-295.
[18]Qi F,Xu B,Zhao L,et al.Comparison of the efficiency and mechanism of catalytic ozonation of 2,4,6-trichloroanisole by iron and manganese modified bauxite[J].Applied Catalysis B:Environmental,2012,121:171-181.