Fouling of nanofiltration membrane by e uent organic matter:
Characterization using di erent organic fractions
in wastewater |
| |
Authors: | ZHANG Liqing WANG Lei ZHANG Gang and WANG Xudong |
| |
Institution: | 1. Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi''an University of Architecture and Technology, Xi''an 710055, China;2. School of Civil and Architectural Engineering, University of Jinan, Jinan 250022, China |
| |
Abstract: | The UF membrane with molecular weight cuto (MWCO) ranging from 2 to 100 kDa and XAD-8 resin were employed to identify
the characteristic of molecular weight (MW) distribution of wastewater e uent organic matter (EfOM) in terms of TOC and UV254,
as well as the amounts of the hydrophilic/hydrophobic organic fractions in di erent MW ranges. Then, the nanofiltration (NF)
membrane fouling experiments were carried out using the above fractionated water to investigate the e ect of MW distribution and
hydrophilic/hydrophobic characteristics of EfOM on the membrane flux decline using the fractionated water samples. The experimental
results have shown that 45.61% of the total organics belongs to the low MW one, among which the percentage of the hydrophilic
organics with low MW (less than 2 kDa) was up to 28.07%, while that of the hydrophobic organics was 17.54%. In particular,
the hydrophilic fraction was found to be the most abundant fraction in the e uents. MW distribution has a significant e ect on the
membrane fouling. When the MWwas less than 30 kDa, the lower the MW, the larger was the specific flux decline, while in the case of
MW higher than 30 kDa, the higher the MW, the larger was the specific flux decline, and the decline degree of low MW organics was
larger than the high MW one. With the same MW distribution range, specific flux decline of the hydrophilic organic was considerably
slower than that of the hydrophobic organic, which indicated that the hydrophobic organic fractions dominantly contribute to the flux
decline. |
| |
Keywords: | molecular weight (MW) distribution hydrophilic/hydrophobic nanofiltration specific flux |
本文献已被 ScienceDirect 等数据库收录! |
| 点击此处可从《环境科学学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《环境科学学报(英文版)》下载免费的PDF全文 |
|