Wettability of mixed filter media and its performance in filtering and treating oily wastewater
MAN Shi-de1,2, QI Jun-ye1,3, CHE Ying-long1,2, WEI Bi-gui1,2
1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; 2. Key laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, China; 3. CCCC-SHEC Engineering Design & Research Institute, Xi'an 710065, China
Abstract：To investigate the coupling effect of two special wettability filter media with opposite wettability, the superhydrophobic and superhydrophilic quartz sand filter medium and the superhydrophilic and underwater superhydrophobic quartz sand filter medium were mixed, and the wettability and filtration performance for oil removal of the mixed filter media were studied. The results showed that the wettability of the solid surface composed of the two kinds of filter media did not satisfy the weighted average relationship with the wettability of each filter medium. It was more consistent with the relation of conic curve, and the determination coefficient is as high as 0.9992. The oil removal efficiency of filtration was coupled with the alternate wettability. The more hydrophobic and lipophilic the mixed filter media was, the greater the oil removal efficiency, normalized adhesion efficiency and permeability coefficient were, and vice versa. The smaller the particle size of filter material was, the greater the slope of the normalized adhesion efficiency was, while the effect of filter speed and bed depth on the slope of the normalized adhesion efficiency was not noticeable. The hydrophobicity of the filter material has the effect of increasing resistance; the increase of the filter rate increased the permeability coefficient of the filter layer. This work demonstrated the filtration of mixed filter media for oil removal and provided a new idea for filtration treatment of oily wastewater.
满世德, 祁军业, 车应龙, 未碧贵. 混合滤料的润湿性及其过滤处理含油废水性能[J]. 中国环境科学, 2022, 42(5): 2105-2111.
MAN Shi-de, QI Jun-ye, CHE Ying-long, WEI Bi-gui. Wettability of mixed filter media and its performance in filtering and treating oily wastewater. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2105-2111.
Ying T, Su J, Jiang Y, et al. A pre-wetting induced superhydrophilic/ superlipophilic micro-patterned electrospun membrane with self- cleaning property for on-demand emulsified oily wastewater separation [J]. Journal of Hazardous Materials, 2020,384:121475.
[2]
Kintisch E. An audacious decision in crisis gets cautious praise [J]. Science, 2010,329(5993):735.
[3]
胡卓祺,陈泉源.磁性氧化石墨处理乳化含油废水及磁致增强效应 [J]. 中国环境科学, 2020,40(7):2970-2977. Hu Z Q, Chen Q Y. Treatment of emulsified oily wastewater by magnetic graphite oxide and magneto-induced enhanced effect [J]. China Environmental Science, 2020,40(7):2970-2977.
[4]
Zhao C, Zhou J, Yan Y, et al. Application of coagulation/flocculation in oily wastewater treatment: A review [J]. Science of the Total Environment, 2021,765:142795.
[5]
Wu S L, Quan L N, Huang Y T, et al. Suspended membrane evaporators integrating environmental and solar evaporation for oily wastewater purification [J]. ACS Applied Materials & Interfaces, 2021,13(33):39513-39522.
[6]
Wei B, Yue C, Liu J, et al. Fabrication of superhydrophilic and underwater superoleophobic quartz sand filter for oil/water separation [J]. Separation and Purification Technology, 2019,229:115808.
[7]
Hwang J, Sharma M M. Generation and filtration of O/W emulsions under near-wellbore flow conditions during produced water re-injection [J]. Journal of Petroleum Science and Engineering, 2018,165:798-810.
[8]
Wei B, Chang Q, Bao C, et al. Surface modification of filter medium particles with silane coupling agent KH550 [J]. Colloids and Surfaces A, 2013,434:276-280.
[9]
Singh C J, Mukhopadhyay S, Rengasamy R S. Oil separation from oil in water emulsion by coalescence filtration using kapok fiber [J]. Environmental Technology, 2021:1-13.
[10]
Kota A K, Kwon G, Choi W, et al. Hygro-responsive membranes for effective oil–water separation [J]. Nature communications, 2012,3(1):1-8.
[11]
Liu J, Zhu X, Zhang H, et al. Superhydrophobic coating on quartz sand filter media for oily wastewater filtration [J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018,553:509-514.
[12]
Wei B, Chang Q, Yan C. Wettability determined by capillary rise with pressure increase and hydrostatic effects [J]. Journal of Colloid and Interface Science, 2012,376(1):307-311.
[13]
Zhou Y, Tang X, Xu Y, et al. Effect of quaternary ammonium surfactant modification on oil removal capability of polystyrene resin [J]. Separation & Purification Technology, 2010,75(3):266-272.
[14]
Chang Q, Wei B, He Y. Capillary pressure method for measuring lipophilic hydrophilic ratio of filter media [J]. Chemical Engineering Journal, 2009,150(2):323-327.
[15]
Whyman G, Bormashenko E, Stein T. The rigorous derivation of Young, Cassie–Baxter and Wenzel equations and the analysis of the contact angle hysteresis phenomenon [J]. Chemical Physics Letters, 2008,450(4-6):355-359.
[16]
Panchagnula M V, Vedantam S. Comment on how wenzel and cassie were wrong by gao and mccarthy [J]. Langmuir the Acs Journal of Surfaces & Colloids, 2007,23(26):13242-13242.
[17]
Kulkarni P S, Patel S U, Chase G G. Layered hydrophilic/hydrophobic fiber media for water-in-oil coalescence [J]. Separation and Purification Technology, 2012,85:157-164.
[18]
Latthe S S, Kodag V S, Sutar R S, et al. Sawdust-based superhydrophobic pellets for efficient oil-water separation [J]. Materials Chemistry and Physics, 2020,243:122634.
[19]
Chaudhury M K, Chakrabarti A, Tibrewal T. Coalescence of drops near a hydrophilic boundary leads to long range directed motion [J]. Extreme Mechanics Letters, 2014,1:104-113.
[20]
O'Melia C R, Stumm W. Theory of water filtration [J]. Journal - American Water Works Association, 1967,59(11):1393–1412.
[21]
Huang Q G, Pan G, Song B W, et al. Numerical simulation of superhydrophobic surface's flow field characteristic and drag reduction rule [J]. Journal of Ship Mechanics, 2014,18(1):1-11.
[22]
Monfared M, Alidoostan M A, Saranjam B. Experimental study on the friction drag reduction of superhydrophobic surfaces in closed channel flow [J]. Journal of Applied Fluid Mechanics, 2019,12(1):69-76.
[23]
Min T, Kim J. Effects of hydrophobic surface on skin-friction drag [J]. Physics of Fluids, 2004,16(7):L55-L58.
[24]
Wang X, Wang Y, Tian H, et al. Effects of the slip wall on the drag and coherent structures of turbulent boundary layer [J]. Acta Mechanica Sinica, 2021,37(8):1278-1290.
