预臭氧与后臭氧-生物活性炭联用工艺研究

Study on the Combination of Preozonation and Post-Ozonation-BAC Process for Drinking Water Treatment

利用静态批量和动态连续试验初步研究了预臭氧及预臭氧与后臭氧-BAC组合工艺对南方某含溴离子水库水的处理效果和相应的处理条件.静态实验结果表明,预臭氧反应量在0.5～1.0mg/L范围内,在有效去除消毒副产物(DBPFP,主要包括THMFP和HAAFP)的同时,臭氧副产物溴酸可以控制在10μg/L以下,而继续增加臭氧反应量则会导致DBPFP的增加.当水中溴离子浓度达到96μg/L时,使用臭氧必须采取溴酸控制措施.连续动态实验结果表明,预臭氧与臭氧-生物活性炭组合工艺对于2μm以上颗粒物、CODMn、TOC等的去除均有明显的效果,可以进一步抑制DBPs的形成.

This study was conducted to illustrate the effectiveness of preozonation or O3-BAC or combination of these two process in controlling DBPs for treating a dam source water in South China through SBR and continuous flow （200L/h） experiments and the variables in the treatment train included the point of preozonation with respect to coagulation; the point of ozonation with respect to BAC, the ozone dosage required for preozonation and the Br- content of raw water. Results indicated the reduction in DBP formation potential closely paralleled the reduction in UV absorbance, and trihalomethane and haloacetic acid formation potential can be removed under a dose of preozone at 0.5-1.0mg/L, at the same time, ozone by-products （bromate and formaldehyde） can be controlled in low level. The continuous flow experiment results show that combination of preozonation and O3-BAC process has obviously positive effects on the removals of particles with a size above 2μm, CODMn, and TOC. However, DBPs formation can be controlled by the removal of organic matters.