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8150719 
Journal Article 
Capillary pressure method for measuring the lipophilic hydrophilic ratio of filter media 
Wei, B; Chang, Q; He, Y; Xiao, M 
2009 
Yes 
Huanjing Kexue Xuebao / Acta Scientiae Circumstantiae
ISSN: 0253-2468 
29 
5 
949-954 
Chinese 
The Lipophilic Hydrophilic Ratio (LHR) based on the Washburn equation of five filter media were calculated from the wetting rates of cyclohexane (apolar) and water (polar) filtered through compact filter media beds and measured by capillary pressure. The surface structures of the filter media were characterized by XPS and FTIR. It was confirmed by the high regression coefficients and reproducibility of wetting rates that the values have a good reliability and the technique is applicable. The LHR values of nutshell, manganese sand, ceramic granules, quartz sand and ceramic sand were 66.87, 1.24, 1.22, 1.16 and 0.80 respectively which shows that nutshell are highly lipophilic while manganese sand, ceramic granules and quartz sand are somewhat more lipophilic than ceramic sand, which is consistent with the results of XPS and FTIR. 
Lipophilic hydrophilic ratio (LHR); Oily wastewater; Washburn equation; Water treatment filter media; Wettability