KMS of Research Center for Eco-Environmental Sciences， CAS
| Ultrafiltration membrane fouling control by two-stage coagulant dosing with moderate pH adjustment | |
He, Yitian ; Huang, Xin; Li, Tianyu; Lv, Xuemin; Tang, Na; Feng, Chenghong; Shi, Baoyou
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| 2022-09-01 | |
| Source Publication | DESALINATION
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| ISSN | 0011-9164 |
| Volume | 537Issue:0Pages:115893 |
| Abstract | For the coagulation-ultrafiltration process, it has been recognized that coagulation under acidic condition could greatly alleviate membrane fouling, but the high chemical consumption for pH adjustment and the diminished alkalinity of effluent severely restrict the practical application of this operation. In this study, it was found that two-stage coagulant dosing (separate dosing during rapid mixing and medium speed mixing) with pH adjusted to 6.5 could alleviate membrane fouling as that by one-time coagulant dosing at pH 5.5, which could significantly lower the chemical consumption for pH adjustment. Both the favorable aluminum hydrolysis speciation on the floc surface and the reduced interface interaction between membrane and foulant at pH 6.5 contributed to the effectiveness of this method on membrane fouling control. Compared with the scenarios at pH 5.5 and 7.5, the two-stage dosing at pH 6.5 could promote more aluminum species transformation to amorphous Al(OH)3 on the surface of flocs, resulting in less residual Al in the effluent. The acid-base interaction between foulant and membrane dominated membrane fouling. The degree of membrane fouling by separate dosage ratio of 3:7 at pH 6.5 was as low as that by one-time dosing at pH 5.5 because of the similarly low acid-base interaction energy. |
| Department | 中国科学院饮用水科学与技术重点实验室 ; 中国科学院饮用水科学与技术重点实验室 |
| Keyword | FLOC PROPERTIES POLYALUMINUM CHLORIDE WATER-TREATMENT ORGANIC-MATTER RESIDUAL AL ALKALINITY EFFICIENCY SURFACES SALTS |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/47913 |
| Collection | 中国科学院饮用水科学与技术重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Beijing OriginWater Membrane Technol Co Ltd, Beijing 101407, Peoples R China 4.Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China |
| Recommended Citation GB/T 7714 | He, Yitian,Huang, Xin,Li, Tianyu,et al. Ultrafiltration membrane fouling control by two-stage coagulant dosing with moderate pH adjustment[J]. DESALINATION,2022,537(0):115893. |
| APA | He, Yitian.,Huang, Xin.,Li, Tianyu.,Lv, Xuemin.,Tang, Na.,...&Shi, Baoyou.(2022).Ultrafiltration membrane fouling control by two-stage coagulant dosing with moderate pH adjustment.DESALINATION,537(0),115893. |
| MLA | He, Yitian,et al."Ultrafiltration membrane fouling control by two-stage coagulant dosing with moderate pH adjustment".DESALINATION 537.0(2022):115893. |
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| File Name/Size | DocType | Version | Access | License | ||
| Ultrafiltration memb（2627KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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