预臭氧 BAC工艺处理微污染原水参数优化与有机物去除特性

采用中试装置研究了预臭氧生物活性炭工艺对长江南京段微污染原水有机物的去除特性，考察了臭氧投加量和臭氧接触时间对预臭氧氧化、砂滤及生物活性炭单元中DOC、BDOC、CODMn、UV254和微量有机污染物去除的影响。结果表明当臭氧投加量为3 mg/L、臭氧接触时间为10 min时，预臭氧氧化单元中DOC、CODMn和UV254的去除率分别达到19％、31％和78％，BDOC增长了33％；砂滤单元四种指标的去除率分别为25％、52％、42％和44％，而生物活性炭滤柱对四种污染物指标的去除率分别为46％、83％、52％和20％，高于常规处理工艺。整个工艺对三种微量有机物（1，2，4三氯苯、DMP和DEHP）的去除率也分别达到了60％、68．6％和68．8％。与未投加臭氧相比，臭氧的投加有效促进了砂滤和生物活性炭对有机污染物的去除。采用预臭氧生物活性炭工艺处理微污染长江原水，有效提高了有机污染物的去除效果，可保障出水水质安全。

Optimization of Parameters and Characteristics of Organics Removal with Preozonation-BAC Processes for Micropolluted Raw Water

According to micropolluted raw water of Nanjing section of the Yangtze River,the pilot plant was used to study the removal effect of organics by pre-ozone-BAC. The removal of organic matters was investigated in different dosage of ozone and ozone contact time conditions. The results show that when ozone dosage is 3 mg/L and ozone contact time is 10 min,the removal rates of DOC, CODMn and UV254 are 19%,31% and 78%,while BDOC increases 33% in pre-ozonation unit;the removal rates of four indexes reach 25%,52%,42% and 44% in sand filter unit,and 46%,83%,52% and 20% in the BAC column,which are higher than those of conventional treatment process. Removal efficiency of there kinds of trace organics such as 1,2,4-three chlorobenzene,DMP and DEHP,reach 60%,68. 6% and 68. 8%,respectively in whole process. Compared with no addition of ozone,pre-ozone-BAC process can effectively improve the removal of organic pollutants of micropolluted raw water from the Yangtze River,and can ensure the water quality security.