O_3—BAC工艺炭滤池pH变化关键因素探究  

STUDY ON THE KEY FACTORS OF CARBON FILTER PH VALUE CHANGES IN O_3-BAC PROCESS

作　　者：陈江玲[1] 陆少鸣[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广东广州510006

出　　处：《水处理技术》2012年第3期80-83,共4页Technology of Water Treatment

基　　金：国家十一五水专项课题(2009ZX07423-003-2)

摘　　要：针对南方湿热地区深度处理O3-生物活性炭(BAC)工艺炭滤池出水pH大幅降低问题,研究了主接触池O3投加量、炭滤池内的酸性气体CO2、炭滤池进水水质等因素对炭滤池出水pH的影响。结果表明,当主接触池O3投加量增加至5 mg·L-1时,炭滤池内pH无变化;炭滤池产生CO2对炭滤池pH的影响可忽略不计;但当炭滤池进水pH从6.10～9.10改变时,炭滤池出水pH维持在6.80～7.00。炭滤池是个酸碱缓冲系统,其关键作用的是活性炭自身。活性炭表面化学性质研究发现,活性炭表面含氧官能团具有两性性质,能中和水中的H+或OH-。且活性炭表面含氧官能团的数量随着其使用时间的延长而逐渐减少,从而使活性炭pH下降,致使炭滤池在长期使用过程中出现pH下降的现象。It＇s a common problem that O3-BAC process carbon filter effluent pH reduced greatly in the hot and humid regions deep treatment. In Guangzhou a tap water factory, the influence factors such as the ozone dosing quantity, acid gas CO2 in carbon filter, the effluent quality including pH change were researched. Test results showed that the ozone dosing quantity from 0 to 5 mg.L-1 didn＇t effect on carbon filter effluent pH; and the influence of the pH by acid gas CO2 from carbon filter could be negligible. But when influent pH changed from 6.10-9.10, carbon filter effluent pH, basically maintained in the range of 6.80-7.00. Carbon filter was a huge acid-base buffeting system, and activated carbon was the key factor of pH change. Activated carbon surface chemical properties was studied, and it found that oxygen functional groups on activated carbon surface were decreased along with the extension use of activated carbon, thus to make activated carbon pH fall, and then to result in the phenomenon- the decline of pH in the carbon filter for a long time in the process.

关 键 词：活性炭 PH 缓冲系统 含氧官能团 O3投加量 CO2 

分 类 号：TU991.27[建筑科学—市政工程]