Superior Antifouling Capability of Hydrogel Forward Osmosis Membrane for Treating Wastewaters with High Concentration of Organic Foulants
| Autor: | Detao Qin, Zhi Liu, Zhaoyang Liu, Hongwei Bai, Darren Delai Sun |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Osmosis Fouling Forward osmosis Portable water purification Hydrogels Membranes Artificial 02 engineering and technology General Chemistry 010501 environmental sciences Wastewater 021001 nanoscience & nanotechnology complex mixtures 01 natural sciences Water Purification Biofouling Membrane chemistry Chemical engineering Self-healing hydrogels Environmental Chemistry Humic acid 0210 nano-technology 0105 earth and related environmental sciences |
| Zdroj: | Environmental sciencetechnology. 52(3) |
| ISSN: | 1520-5851 |
| Popis: | Wastewaters with high concentrations of organic pollutants pose a great challenge for membrane filtration due to their severe fouling propensity. In this study, a hydrogel forward osmosis (FO) membrane is explored for treating wastewaters of high concentration organic pollutants. This FO membrane has an ultrathin hydrogel selective layer, which is highly hydrophilic (water contact angle as low as 18°) and smooth (surface roughness5 nm). Investigated with typical organic foulants (protein, alginate, humic acid, and oil) of high concentration (2000-20 000 mg/L), this hydrogel FO membrane exhibits remarkably superior antifouling capability, with its water flux decline ratio lower than a quarter that of commercial FO membrane under identical experimental conditions. The foulants on hydrogel membrane surface can be easily removed by simple physical cleaning without any chemical usage. At the same time, this hydrogel FO membrane achieves ∼2 times higher separation efficiency than commercial FO membrane in terms of specific water flux (J |
| Databáze: | OpenAIRE |
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