摘要
微气泡技术与臭氧废水处理相结合,有助于促进臭氧气液传质、改善臭氧氧化效果并提高臭氧利用率.本研究采用臭氧微气泡氧化处理酸性大红3R废水,考察了臭氧微气泡的气液传质特性以及对酸性大红3R氧化降解特性,并与臭氧传统气泡进行比较.结果表明,微气泡能够强化臭氧气液传质,相同条件下其臭氧传质系数为传统气泡的3.6倍;同时微气泡系统的臭氧分解系数为传统气泡系统的6.2倍,有利于·OH产生.臭氧微气泡可显著提高酸性大红3R氧化降解速率和矿化效率,其TOC去除率可达78.0%,约为传统气泡的2倍.臭氧微气泡处理酸性大红3R过程中的臭氧利用率显著高于传统气泡:微气泡系统平均臭氧利用率为97.8%;传统气泡系统平均臭氧利用率为69.3%.臭氧微气泡通过促进·OH产生提高臭氧氧化能力,其对降解中间产物的氧化速率更快,其中对小分子有机酸的矿化能力约为传统气泡的1.6倍.
The application of microbubble technology for ozonation wastewater treatment could enhance ozone mass transfer,improve ozonation performance and increase ozone utilization efficiency. The ozone microbubbles were used to treat synthetic acid red 3R wastewater in the present study,and compared to ozone conventional bubbles. The ozone mass transfer and ozonation characteristics of acid red 3R were investigated when ozone microbubbles and ozone conventional bubbles were applied. The results confirmed the enhanced ozone mass transfer using microbubbles. The ozone mass transfer coefficient using microbubbles was 3. 6 times higher than that using conventional bubbles under the same conditions. Simultaneously,the ozone decomposition coefficient using microbubbles was6. 2 times higher than that using conventional bubbles,which would be favorable for ·OH generation. The ozonation rate and mineralization efficiency of acid red 3R could be improved significantly using ozone microbubbles. A TOC removal efficiency of 78. 0%was achieved using ozone microbubbles,which was about 2 times higher than that using ozone conventional bubbles. The ozone utilization efficiency using microbubbles was much higher that using conventional bubbles during ozonation treatment of acid red 3R.The average ozone utilization efficiencies were 97. 8% and 69. 3% when microbubbles and conventional bubbles were used,respectively. The oxidative ability of ozone microbubbles could be increased by enhancing ·OH generation,and as a result,the oxidative reaction of degradation intermediates was accelerated by ozone microbubbles. Especially,the mineralization ability of small organic acid intermediates using ozone microbubbles was about 1. 6 times higher than that using ozone conventional bubbles.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2015年第2期584-589,共6页
Environmental Science
基金
河北省应用基础研究计划重点基础研究项目(11966726D)
河北科技大学校立科研基金项目(YY28)
关键词
微气泡
臭氧氧化
酸性大红3R
臭氧利用率
矿化
microbubble
ozonation
acid red 3R
ozone utilization efficiency
mineralization
