Open AccessFiltration of oil from oily wastewater via hydrophobic modified quartz sand filter medium
Author(s) -
Bigui Wei,
Jianlin Liu,
Gang Wang,
Qing Chang
Publication year - 2018
Publication title -
journal of water reuse and desalination
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.548
H-Index - 16
eISSN - 2408-9370
pISSN - 2220-1319
DOI - 10.2166/wrd.2018.052
Subject(s) - filtration (mathematics) , wetting , filter (signal processing) , adsorption , quartz , contact angle , chemical engineering , filter paper , surface modification , chromatography , materials science , chemistry , organic chemistry , composite material , statistics , mathematics , computer science , engineering , computer vision
To improve the hydrophobicity and lipophilicity of a quartz sand filter medium, two coupling agents, DN101 and KH570, were employed. The filter medium surface wettability and oil removal efficiency before and after modification were investigated, and the characteristics are summarized. The test results show that, after modification by the grafting of an organic long-chain coupling agent to the filter medium surface, the Lipophilic to Hydrophilic Ratio increased from 1.31 (UQS) to 12.09 (MQD-Ti) and 5.11 (MQD-Si), and the oil removal efficiencies of MQD-Ti and MQD-Si improved by 21.7% and 6.9%, respectively. The stronger hydrophobicity resulted in higher quality factor values of 0.668 m −1 and 0.548 m −1 for MQD-Ti and MQD-Si, respectively, compared to 0.533 m −1 for UQS. This means that improving the filter medium surface hydrophobicity and oil removal efficiency via filter medium surface modification is effective.
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