摘要
为研究不同阴离子条件下纳米TiO_2催化臭氧化(nano-TiO_2/O_3)过程对溴酸盐(BrO_3^-)生成的影响,本研究通过小试实验分别考察了不同浓度溴离子(Br^-)、氯离子(Cl^-)、碳酸氢根离子(HCO_3^-)、硫酸根离子(SO_4^(2-))和亚硝酸根离子(NO_2^-)对纳米TiO_2催化臭氧化过程BrO_3^-生成的影响,并对不同阴离子条件下单独臭氧化(O_3)过程和nano-TiO_2/O_3过程BrO_3^-生成情况进行对比。结果表明,不同Br-初始浓度下,相对于O_3过程,纳米TiO_2对BrO_3^-生成的抑制效果规律不明显;Cl-浓度从0增至150 mg·L^(-1)时,纳米TiO_2抑制率呈现先增加后下降的趋势;HCO_3^-存在的水体,投加纳米TiO_2对BrO_3^-生成的抑制效能大大减弱;当SO_4^(2-)初始浓度为0~90 mg·L^(-1)时,相对于O_3过程,nano-TiO_2/O_3过程BrO_3^-生成量减少了22.50%~68.77%;当NO_2^-初始浓度为0~1 mg·L^(-1)时,相对于O_3过程,nano-TiO_2/O_3过程BrO_3^-生成量减少了2.22%~68.77%。
To study the effects of different anions on bromate formation during the nano-TiO_2 catalytic ozonation process,the effects of different concentrations of Br^-,Cl^-,HCO3^-,SO4^2-,and NO2^-were investigated in a bench-scale test. The bromate formation achieved using different ions in the O_3 and nano-TiO_2/ O_3 processes was compared. The results showed that,compared to the O_3 process,the inhibition efficiency of nano-TiO_2 on bromate formation with varied Br^-concentrations was unclear. The inhibition efficiency of nano-TiO_2 increased rapidly at first and then decreased with increasing Cl^-concentration from 0 to 150 mg·L^-1. Adding HCO3^-could significantly decrease the inhibition efficiency of nano-TiO_2 on bromate formation. Compared to the O_3 process,the formation of bromate in the nano-TiO_2/ O_3 process was 22. 50% ～ 68. 77% lower when the SO4^2-initial concentrations were 0 ～ 90 mg · L^-1and 2. 22% ～ 68. 77% lower when the NO2^-initial concentrations were 0 ～1 mg·L^-1.
作者
吴悦
吴纯德
WU Yue WU Chunde(Shantou Polytechnic, Shantou 515078, China College of Environment and Energy, South China University of Technology, Guangzhou 510006, China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第2期755-759,共5页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51078148
41173103)
汕头职业技术学院科研课题(SZK2016Y17)
