This study describes an approach for surface modification of a nonwoven membrane by diatomite/iron oxide to examine its filterability. Analysis results showed that nonwoven hydrophilicity is enhanced. Static contact angle decreases dramatically from 122.66° to 39.33°. Scanning electron micrograph images show that diatomite/iron oxide is attached on nonwoven fiber. X-ray diffraction analysis further proves that the compound is mostly magnetite. Fourier transformed infrared spectra results reveal that two new absorption peaks might be attributed to SiO and FeO, respectively. Modified and original membranes were used in double nonwoven membrane bioreactors (MBRs) for synthetic wastewater treatment. High critical flux, long filtration time, slow trans-membrane pressure rise and stable sludge volume index confirmed the advantages of modified nonwoven. Comparing with original nonwoven, similar effluent qualities are achieved, meeting the requirements for wastewater reclamation.
Performance of diatomite/iron oxide modified nonwoven membrane used in membrane bioreactor process for wastewater reclamation
Yueling He, Wenqi Zhang, Pinhua Rao, Peng Jin; Performance of diatomite/iron oxide modified nonwoven membrane used in membrane bioreactor process for wastewater reclamation. Water Sci Technol 1 August 2014; 70 (3): 533–539. doi: https://doi.org/10.2166/wst.2014.254
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