摘要
以印染废水生化出水为研究对象,采用非线性方程拟合不同水温条件下臭氧对A254(254nm的吸光度)和溶解性有机碳(DOC)的去除过程,分析了表观一级反应速率系数k(t)的变化规律。拟合结果表明,当水温在280~313 K时,60 min内A254和DOC的k(t)变化范围分别为(0.063 5±0.031 6)^(0.089 5±0.044 1)min-1和(0.011 0±0.005 7)^(0.020 9±0.002 9)min-1,且都随反应时间呈整体下降趋势。DOC平均活化能约为A254的2倍,臭氧对DOC的去除更易受到水温变化的影响。另外,较高的溶解臭氧质量浓度有利于在低温条件(280 K)下在反应初始阶段就获得较大的DOC反应速率系数。
The ozonation of A254 and DOC in biotreated textile effluents at various water temperatures was studied in this paper.Evolution of apparent first-order rate coefficient k（t） was analyzed in terms of non-linear model.Results showed that k（t） of A254 and DOC,which decreased with reaction time entirely,varied from（0.063 5±0.031 6） min-1 to（0.089 5±0.044 1） min-1 and from（0.011 0±0.005 7） min-1 to（0.020 9±0.002 9） min-1 during 60 min,respectively,when water temperature is at 280-313 K.Furthermore,the effect of temperature on DOC removal was more significant,since mean activation energy of the former was twice as much as A254.And high dissolved ozone concentration appeared to enhance k（t） of DOC at 280 K in the initial stage of ozonation.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第1期59-62,共4页
Journal of East China University of Science and Technology
基金
国家高技术研究发展计划863重点项目(2009AA063904)
关键词
臭氧氧化
印染废水生化出水
水温
表观一级反应速率系数
ozonation
biotreated textile effluents
water temperature
apparent first-order rate coefficients
