金属氧化物/膨润土催化剂臭氧催化处理高盐废水
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摘要
采用混合法制备Al_2O_3-CuO-CeO_2/膨润土臭氧催化剂,探究制备过程中焙烧温度及焙烧时间对催化剂活性的影响。利用制备的催化剂成品对模拟高盐废水进行臭氧催化氧化实验,考察高含量Na_2SO_4、初始pH、催化剂投加量及臭氧投加量等几个因素对有机物去除的影响。结果表明,在焙烧温度为800℃、时间为4 h时,催化剂具有最高的催化活性;高盐环境有利于有机物的去除,当初始pH为7、催化剂投加量为150 g/L时,臭氧投加量为32.1 mg/L时,COD去除率达到最高,大于80%。
The catalyst Al_2O_3-CuO-CeO_2/bentonite was prepared by mixing method. The effect of calcination temperature and calcination time on catalyst activity during the preparation process was explored. Ozone catalytic oxidation experiments were performed on simulated high salinity wastewater treated by prepared catalyst. The effects of high salt(referred to high Na_2SO_4), initial pH, catalyst dosage and ozone dosage on the removal of organic matter were investigated. The results showed that, the catalyst had the highest catalytic activity when the calcination temperature was 800 ℃ and the calcination time was 4 h. The high salt environment was conducive to the removal of organic matter. When the initial p H was 7, the catalyst dosage was150 g/L, and the ozone dosage was 32.1 mg/L, the COD removal rate reached the maximum was above 80%.
The catalyst Al_2O_3-CuO-CeO_2/bentonite was prepared by mixing method. The effect of calcination temperature and calcination time on catalyst activity during the preparation process was explored. Ozone catalytic oxidation experiments were performed on simulated high salinity wastewater treated by prepared catalyst. The effects of high salt(referred to high Na_2SO_4), initial pH, catalyst dosage and ozone dosage on the removal of organic matter were investigated. The results showed that, the catalyst had the highest catalytic activity when the calcination temperature was 800 ℃ and the calcination time was 4 h. The high salt environment was conducive to the removal of organic matter. When the initial p H was 7, the catalyst dosage was150 g/L, and the ozone dosage was 32.1 mg/L, the COD removal rate reached the maximum was above 80%.
引文
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[2]张小龙,梅滨,陈广银,等.强化接触氧化法处理高盐废水[J].环境科学与技术,2008,31(12):153-156.
[3]李凤娟,徐菲,李小龙,等.高盐度废水处理技术研究进展[J].环境科学与管理,2014,39(2):72-75.
[4]WANG H C,CHANG S H,HUNG P C,et al.Synergistic effect of transition metal oxides and ozone on PCDD/F destruction[J].Journal of Hazardous Materials,2009,164(2):1452-1459.
[5]康金山.臭氧催化氧化-生物法联合处理高盐度有机废水[D].长春:吉林大学,2011.
[6]水质化学需氧量的测定快速消解分光光度法:HJ/T 399-2007[S].
[7]范文玉,杨小峰,李康,等.多孔ZnO/膨润土臭氧催化剂的制备及表征[J].环境工程,2017,35(1):46-50.
[8]亓丽丽.非均相臭氧催化氧化对氯苯酚机理研究及其工艺应用[D].哈尔滨:哈尔滨工业大学,2013.
[9]MOUSSAVI G,KHAVANIN A,ALIZADEH R.The investigation of catalytic ozonation and integrated catalytic ozonation/biological processes for the removal of phenol from saline wastewaters[J].ournal of Hazardous Materials,2009,171(1):175-181.
[10]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.
[11]岳山,杨永哲,杨宏勃,等.Ce O2-Mg O/AC催化剂开发及臭氧催化氧化深度处理制药废水[J].水处理技术,2017(9):109-114.
[12]王兵,袁增,李永涛,等.Mn3O4催化臭氧化处理钻井废水[J].环境工程学报,2015,9(7):3319-3324.