粉末活性炭粒径对PAC-UF工艺处理效能的影响  

EFFECT OF THE PARTICLE SIZE OF POWDERED ACTIVATED CARBON ON THE PERFORMANCE OF PAC-UF PROCESS

作　　者：闫新秀 牛晓君[1,2] 王彩虹[3] 吴浩[1,2] 伍健东[1,2] 

机构地区：[1]华南理工大学环境与能源学院,510006 [2]华南理工大学工业聚集区污染控制与生态修复教育部重点实验室,510006 [3]广东省建筑设计研究院,广东广州510010

出　　处：《水处理技术》2014年第12期104-109,共6页Technology of Water Treatment

摘　　要：采用3种粒径的粉末活性炭(PAC,50μm、3μm、200 nm),考察了PAC粒径变化对天然有机物的吸附性能和吸附前后的水中有机物分子量分布的影响,探讨了不同PAC投加量、投加方式和吸附程度条件下,PAC粒径对PAC-UF工艺处理效果以及膜污染的影响。结果表明,PAC可以有效地吸附UF膜难于截留的小分子量有机物,粒径减小有助于增强其对30 k^100 k分子质量有机物组分的吸附;PAC投加量增加和粒径减小均增大了其吸附容量,提高了PAC-UF工艺的有机物去除率,并进一步减缓了膜污染;集中式投加并未因为与有机物的接触时间延长而改善PAC-UF工艺的去除率和减缓膜污染程度,连续式投加是PAC-UF工艺最有效的投加方式;此外,PAC与有机物在膜面形成的活性炭滤饼层,可以对有机物起到额外截留的作用,而缓解膜污染的主要原因是PAC对有机物的吸附去除,吸附饱和的PAC会加剧膜污染。Three different particle sizes of powdered activated carbon（PAC,50 μm,3 μm and 200 nm） were selected,the effect of particle size of PAC on the adsorption of natural organic matter（NOM） and the relative molecular mass distribution changes before/after adsorption was investigated. And the influence of particle size of PAC on the removal of NOM and the membrane fouling of the PAC-UF process was also evaluated with different PAC dosages,addition modes,and the adsorption degree conditions. The results indicated that PAC could effectively adsorb the NOM of small molecular mass fractions which was difficult to intercept by UF membrane. The decrease of PAC particle size enormously advanced the adsorption of organic matter fractions with relative molecular mass between 30 k and 100 k. With the increase of PAC dosage and the decrease of particle size,the adsorption capacity of PAC for organic matter was significantly enhanced,and it improved the removal efficiency for NOM of the PAC-UF process,and further slowed the membrane fouling. But none of the removal efficiency and the membrane fouling was enhanced by centralized dosing mode,on the contrary,the most effective way for the PAC-UF process was continuous dosing system. In addition,due to the action of extra interception,the cake layer was formed on the membrane surface by the PAC with the organic matter enhanced the removal efficiency for the PAC-UF process,moreover,the organic matter which was adsorbed by PAC as one of most the major factors which relieved membrane fouling,the saturated PAC would aggravate membrane fouling.

关 键 词：粉末活性炭 粒径 天然有机物 超滤膜 

分 类 号：TU991.2[建筑科学—市政工程]