水中共存物质对氯化消毒过程中安替比林去除效能的影响研究

THE EFFECT OF COEXISTING SUBSTANCES IN WATER ON THE REMOVAL EFFICIENCY OF ANTIPYRINE DURING THE PROCESS OF CHLORANATION

以水体中检出频率较高的消炎镇痛类药物安替比林（ANT）为研究对象,以次氯酸钠为消毒剂,考察了水体中主要共存物质对氯化消毒过程中ANT去除效能的影响规律。结果表明,腐殖酸（HA）和NH4＋对ANT氯氧化过程起抑制作用,HCO3-对ANT的氯氧化过程基本没有影响。在实验p H为7.0±0.2、（25±1）℃条件下,随着HA含量的升高,HA对ANT氯氧化去除的抑制作用明显增大,HA与ANT对水中游离氯呈现竞争反应关系。当水体中含有NH4＋时,反应体系中Cl、N质量比〉8：1,则溶液中次氯酸占主要成分,ANT会与次氯酸迅速反应并被去除;反应体系中Cl、N质量比为5：1~1：1时,溶液中NH2Cl占主要成分,但NH2Cl氧化能力较弱,不能完全氧化去除ANT,因此溶液中余氯的主要存在形态决定了ANT氯氧化的快慢。

Antipyrine（ANT）, an anti-inflammatory analgesic, has been frequently detected in the aquatic environment. Experiments have been conducted to investigate the effects of coexisting substances on the removal of ANT in ultrapure water during free chlorine disinfection with sodium hypochlorite as sanitizer. The results demonstrated that both humid acid（HA） and NH4＋have inhibited effect on ANT chlorination while HCO3-has no obvious effect.Under the conditions of p H=7.0±0.2,（25±1） ℃, HA showed significant inhibition to ANT chlorine oxidation with HA content increasing. HA and ANT presented competitive relationship with free chlorine. When NH4＋existed in the solution, hypochlorous acid was the main active oxidant at the ratio of m（Cl）：m（N） 〉8：1, ANT reacted quickly with hypochlorous acid and therefore was removed in a very short time. When the ratio of m（Cl）：m（N） was in the range of 5：1- 1：1, NH2 Cl was the main active oxidant. NH2 Cl has a much weaker oxidative capacity than hypochlorous acid and thus ANT cannot be removed completely. So the existing forms of chlorine play an important role in ANT removal under NH4＋coexistence.