Roles of coagulant species and mechanisms on floc characteristics and filterability
文献类型：期刊论文
| 作者 | Jiao, Ruyuan ; Fabris, Rolando; Chow, Christopher W. K.; Drikas, Mary; van Leeuwen, John; Wang, Dongsheng
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| 刊名 | CHEMOSPHERE
 |
| 出版日期 | 2016-05 |
| 卷号 | 150期号:0页码:211-218 |
| 关键词 | Coagulation mechanisms Flocculation index Floc filterability Al species Floc breakage |
| 英文摘要 | In full scale water treatment operation, the rapid filtration process, as the last step of solid liquid separation, is largely influenced by floc characteristics. In this study, aluminium sulphate (alum) and nano-Al-13 were investigated to understand the influence of coagulant species on the formation and filterability of flocs. At neutral pH, it was found that nano-Al-13, a high MW polymer, showed better floc filterability than alum. This is because of the densely compacted and well-distributed size flocs from nano-Al-13, even though floc sizes of alum were generally bigger. Al specie distributions of the two coagulants at different pH levels were compared by using electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS) to further elucidate the reasons for the superiority of nano-Al-13 in floc filterability. Depolymerisation/re-polymerisation of nano-Al-13 occurred as pH changed, and Al species from nano-Al-13 were more abundant than that from alum, especially for the high molecular weight (MW) oligomers such as Al-11, Al-12, Al-13 and Al-14. Under the charge neutralisation mechanism, higher MW Al species was found to improve coagulation performance and floc filterability. In addition, breakage resistance and regrowth ability of nano-Al-13 was better than alum, at weak acid condition. Flocs formed by the charge neutralisation mechanism readily regenerated after being thoroughly broken up. The floc regrowth ability of nano-Al13 at high shear rates (200 rpm and 300 rpm) was much better than at low shear and better than any shear applied to alum., and the flocs after breakage at 200 rpm and 300 rpm also showed better filterability than other conditions. (C) 2016 Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/36075]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Jiao, Ruyuan,Fabris, Rolando,Chow, Christopher W. K.,et al. Roles of coagulant species and mechanisms on floc characteristics and filterability[J]. CHEMOSPHERE,2016,150(0):211-218. |
| APA | Jiao, Ruyuan,Fabris, Rolando,Chow, Christopher W. K.,Drikas, Mary,van Leeuwen, John,&Wang, Dongsheng.(2016).Roles of coagulant species and mechanisms on floc characteristics and filterability.CHEMOSPHERE,150(0),211-218. |
| MLA | Jiao, Ruyuan,et al."Roles of coagulant species and mechanisms on floc characteristics and filterability".CHEMOSPHERE 150.0(2016):211-218. |
入库方式： OAI收割
来源：生态环境研究中心
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