化学预氧化对苏氨酸生成三氯乙醛的影响

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.

Influence of Chemical Pre-oxidation on Chloral Hydrate Formation of Threonine

The influences of different chemical pre-oxidants, including sodium hypochlorite (NaClO), chlorine dioxide (ClO₂), permanganate (KMnO₄), hydrogen peroxide (H₂O₂), ozone (O₃) and ozone/hydrogen peroxide (O₃/H₂O₂), on chloral hydrate (CH) formation were studied for threonine that has the highest special chloral hydrate formation potential (SCHFP). Suitable pre-oxidants and corresponding optimal doses were determined to provide guidance for controlling chloral hydrate (CH) formation during drinking water treatment. The results indicated that the pre-oxidants that could decrease CH formation for one day incubation time (CH_1d) were H₂O₂, ClO₂, KMnO₄ and NaClO, and the corresponding suitable doses were 3, 0.5, 0.6 and 0.5 mg·L^-1, and the corresponding CH_1d removal rates were 61.54%, 47.63%, 29.77% and 10.94%, respectively. The pre-oxidants that could decrease CH formation potential (CHFP) were KMnO₄, NaClO, H₂O₂ and ClO₂, and the corresponding suitable doses were 0.6 mg·L^-1, 0.5 mg·L^-1, 3 mg·L^-1 and 0.5 mg·L^-1, and the corresponding CHFP removal rates were 41.01%, 33.38%, 8.36% and 2.40%, respectively. In addition, O₃ and O₃/H₂O₂ were not suitable for controlling CH in the conventional treatment process because they could increase CH_1d and CHFP.