水中8种典型嗅味物质的氧化去除研究

Research on the removal of 8 typical taste and odor compounds from source water by oxidation methods

针对水中8种典型嗅味物质,研究了次氯酸钠、高锰酸钾和臭氧等3种常见氧化剂对其的氧化去除效能。结果表明:次氯酸钠仅对3-甲基吲哚有明显的去除效果;高锰酸钾对1-辛烯-3-醇、β-环柠檬醛、2,4,6-三氯苯甲醚和3-甲基吲哚有一定的去除效果;臭氧能有效降解这8种典型嗅味物质,除2-MIB和土臭素的去除率在55%~70%外,其他嗅味物质的去除率均超过90%,是三者中最适宜用于去除典型嗅味物质的氧化药剂。对比不同臭氧投加量和不同反应时间下8种典型嗅味物质的去除效果发现,当嗅味物质浓度为200 ng/L左右时,臭氧的适宜投加量为2 mg/L,反应3~5 min后氧化反应基本实现平衡,去除效能达到稳定。

Aiming at 8 typical taste and odor compounds in source water,the removal efficiency of three common oxidants,including sodium hypochlorite,potassium permanganate and ozone,was studied.The results showed that sodium hypochlorite only had obvious removal effect on 3-methylindole,potassium permanganate had certain removal effect on 1-octene-3-alcohol,β-cyclocitral,2,4,6-trichloroanisole and 3-methyleneindole,while ozone could effectively degrade these compounds.The removal efficiency of ozone on geosmin and 2-MIB was 55%~70%,but was more than 90%on other odor compounds.Therefore ozone is the most suitable oxidizing agent for the removal of typical odor compounds in water.The removal effects of these compounds under different ozone dosage and reaction time were compared,and it was found that when the concentration of odor compounds in water was about 200 ng/L,the suitable dosage of ozone was 2 mg/L.After 3 to 5 minutes reaction,the oxidation reaction was basically balanced and the removal efficiency of odor compounds achieved stability.