摘要
采用臭氧氧化技术降解饮用水中的消毒副产物二氯乙酸(DCAA),考察了DCAA初始浓度、臭氧投量、pH、叔丁醇和不同水质等对DCAA去除效果的影响。结果表明,臭氧对DCAA的氧化去除效果较好,当DCAA初始浓度为100μg/L、pH值为6.88、臭氧投量为1.96 mg/L、反应时间为25 m in时,对DCAA的去除率为32.4%;在相同的试验条件下,臭氧对DCAA的去除率随DCAA初始浓度的增大而降低、随臭氧投量和溶液pH的增大而升高。叔丁醇(.OH抑制剂)的加入显著抑制了臭氧对DCAA的氧化去除效果,表明臭氧氧化DCAA的过程主要遵循羟基自由基反应机理。另外发现,臭氧对给水厂滤后水和松花江原水中DCAA的去除率比超纯水中的分别降低了7.06%和19.58%,由此推测实际水体中的有机物和重碳酸盐会抑制臭氧对DCAA的氧化降解。
The ozonation technology was used to degrade dichloroacetic acid （DCAA）, a disinfection by-product in drinking water. The effects of DCAA concentration, ozone dosage, pH value, tert-butyl alcohol and different water qualities on the removal efficiency of DCAA were investigated. The results show that the removal efficiency of DCAA by ozonation is excellent. The removal rate of DCAA is 32.4% when the DCAA initial concentration is 100 μg/L, pH is 6.88, ozone dosage is 1.96 mg/L and reaction time is 25 rain. Under the same experimental conditions, the removal rate of DCAA is reduced with the increase of the initial DCAA concentration and is increased with the increase of ozone dosage and pH value. The addition of tert-butyl alcohol obviously inhibits the removal of DCAA, indicating that the removal of DCAA during ozonation mainly follows a hydroxyl radical type mechanism. It is found that the removal rates of DCAA in filtrated water and Songhua River water are reduced by 7.06% and 19.58% compared to that in ultrapure water, showing that organic compounds and bicarbonate in actual water would inhibit the degradation of DCAA by ozonation.
出处
《中国给水排水》
CAS
CSCD
北大核心
2010年第11期139-141,共3页
China Water & Wastewater
基金
国家"十一五"科技支撑计划项目(2006BAJ08B02)
国家高技术研究发展计划(863)项目(2007AA06Z339)
关键词
臭氧氧化
饮用水
消毒副产物
二氯乙酸
ozonation
drinking water
disinfection by-product
dichloroacetic acid
