Fabrication and optimization of a clay-bonded SiC flat tubular membrane support for microfiltration applications

Permeability behavior of silicon carbide‐based membrane and performance study for oily wastewater treatment

“…The dead‐end filtration system with pore size 250 nm showed pure‐water permeability 240 Lm −2 h −1 bar −1 . Literature report indicates that depending on the pore size of the membrane support, thickness of the membrane filtration layer, oil concentration in the feed water, the flux and permeability the membranes varied and our membranes show comparable or even better results than reported value. Relative contributions due to inertia and viscous effect on membrane resistance in the interval 0.3‐2.5 bar were calculated and found to be 1.5, 10.0, 11.2, and 5.8% for inertia and 98.5, 90.0, 88.8, and 94.2% due to viscous effects, respectively, for SC1, SC2, SC3, and SC4 membranes.…”

“…For fabrication of SiC ceramics at low temperature most common solutions used are changing the heat treatment environment and sintering aids . Porous SiC membrane supports fabricated from 23 µm SiC and 15 wt % glass frit at 850°C showed variation in water flux from 600 to 1100 Lm −2 h −1 with variation in TMP .…”

“…The alumina‐coated glass‐bonded SiC membrane showed steady‐state flux rate ~1.789 × 10 −5 ‐5.29 × 10 −5 m 3 /m 2 /s at an applied pressure of 1 bar with oil concentration 600 ppm . The multichannel flat clay‐bonded SiC membrane (20 mm length, 50 mm width, 4 mm thick containing 16 inner channels) with 44% porosity, 3.3 µm pore diameter, and flexural strength 32.7 MPa reported to exhibit pure water permeability of 25 000 Lm −2 h −1 bar −1 continuously for 5 hours . The membrane consisting of clay‐bonded SiC support with SiC‐based filtration layer sintered at 1100°C with an average pore size 93 nm showed pure‐water permeability of 210 Lm −2 h −1 bar −1 and reported to exhibit very stable permeance over a long period of time .…”

“…To reduce high sintering temperature and costly inert atmosphere, oxide‐bonding technique is accepted as a simple technique for fabrication of macroporous SiC membrane in which an oxidation‐derived SiO 2 glass or reaction derived oxide bond phases bonded SiC particles . Recently, the fabrications of oxide‐bonded SiC microfiltration membranes by partial sintering using clay or other inorganic oxides as bond phase additives are reported for wastewater treatment and particulate filtration . Partial sintering is the simplest and easiest way to fabricate porous SiC ceramics.…”

Microstructures and Properties of Porous Liquid-Phase-Sintered SiC Ceramic by Hot Press Sintering

“…Moreover, with the increase of coarse particle sizes, there is a decrease in flexural strength due to the small interparticle-bonding area and irregularity in the pore shape. According to Bukhari’ study [33], small bonding areas between SiC grains formed by the initial powder with the larger particle size reduced the flexural strength of the porous L-SiC ceramic. Figure 5 shows the difference of the neck structures of the porous L-SiC ceramics respectively from small and big SiC particles.…”