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以具有最大比三氯乙醛生成潜能(SCHFP)的苏氨酸为研究对象,分析了次氯酸钠(NaClO)、二氧化氯(ClO_2)、高锰酸钾(KMnO_4)、过氧化氢(H_2O_2)、臭氧(O_3)和臭氧过氧化氢(O_3/H_2O_2)等预氧化剂对三氯乙醛(CH)生成的影响,以确定合适的预氧化剂及其适宜投加量,为CH的控制提供指导.结果表明,能够有效去除一天CH生成量(CH1d)的预氧化方式依次为H_2O_2、ClO_2、KMnO_4和NaClO,适宜投加量分别为3、0.5、0.6和0.5mg·L-1,对CH1d相应的去除率分别为61.54%、47.63%、29.77%和10.94%;能够有效去除CH生成潜能(CHFP)的预氧化方式依次为KMnO_4、NaClO、H_2O_2和ClO_2,适宜投加量分别为0.6、0.5、3和0.5mg·L~(-1),对CHFP相应的去除率分别为41.01%、33.38%、8.36%和2.40%;O_3和O_3/H_2O_2预氧化能够使CH1d和CHFP增加,不适用于对CH的控制.
Threonine with the highest ratio of SCHFP was used as the research object. The effects of sodium chloride (NaClO), chlorine dioxide (ClO 2), potassium permanganate (KMnO 4), hydrogen peroxide (H 2 O 2) (O_3) and ozone hydrogen peroxide (O_3 / H_2O_2) on the formation of chloral (CH) in order to determine the appropriate pre-oxidant and its appropriate dosage to provide guidance for the control of CH.Results The results showed that the pre-oxidation ways of CH1d, which can effectively remove CH1d, were H_2O_2, ClO_2, KMnO_4 and NaClO in the order of 3, 0.5, 0.6 and 0.5mg · L-1, respectively, (CHL) were 61.54%, 47.63%, 29.77% and 10.94%, respectively. The preoxidation methods that could effectively remove CHP were as follows: KMnO_4, NaClO, H_2O_2 and ClO_2 with the optimum dosages of 0.6, 0.5, 3 and 0.5mg · L -1, the corresponding removal rates of CHFP were 41.01%, 33.38%, 8.36% and 2.40%, respectively. O_3 and O_3 / H_2O_2 pretreatment could increase CH1d and CHFP, control.