Study on Fabrication of Ceramic Membrane from Shirasu Balloon for Waste Water Filtration

Abstract

The fabrication of low cost ceramic membranes for microfiltration were studied by using a natural materials (shirasu balloon) which are produced from glassy volcanic materials. The shirasu powder was formed into cylindrical shaped membranes and sintered at five different temperatures from 600 °C to 800 °C using spark plasma sintering (SPS). The porosity and density of membranes were measured according to Archimedes method. The effect of sintering temperatures on microstructure and phase of the membranes has been investigated using FESEM and XRD. A filtration experiment was carried out to study the membrane performance for waste water filtration. The quality of the filtered water was determined by analyse the pH, turbidity, suspended solid, chemical oxygen demand (COD) and biochemical oxygen demand (BOD5). The porosity reduced from 48.9% to 40.32% while the membrane density increased from 1.15 g/cm3 to 1.33 g/cm3 with increasing sintering temperatures from 600 °C to 800 °C. A little shrinkage occur during spark plasma sintering process. From the FESEM microstrcture, the maximum pore size of the membrane that has been observed at 600 °C is about 4.7 µm. Shirasu membrane are able to produce clean and clear treated water during the microfiltration test with membrane sintered at 800 °C and there is an improvement in quality of water that has been filtered. The ceramic water filter was successfully produced without the involvement of the high-tech, sophisticated machines and methods as well as complex materials

Hierarchically porous and mechanically stable monoliths from ordered mesoporous silica and their water filtration potential

“… 92 The oil in water filtration of the S-sintered COK-12 monolith is more effective in comparison to S-sintered monoliths produced from volcanic shirasu balloon, which exhibit lower porosities and larger pores at comparable processing parameters. 93 Further S-sintered materials such as diatomite were suggested to be suitable for water purification applications. 94 Furthermore, the produced COK-12 monoliths may present additional benefits, such as molecule capture, due to their hierarchical pore structure from the macro-to the meso-/micropore scale.…”

Hydroxyapatite Coating of Volcanic Glass Microballoons by a Homogeneous Precipitation Process

“…The raw micro balloon shows a broad diffraction peak around 44°, 36° and 27° in Figure 3(e). In regard to the XRD patterns of raw microballoons, Ahmad et al reported the peak at 26.5° and 27.8°derived from quartz, and the peak at 28.2° derived from albite [10] . Therefore, the diffractions we observed correspond to quartz.…”

Low-Cost Antibacterial Ceramic Water Filters for Decentralized Water Treatment: Advances and Practical Applications

“…The filtration process occurs through size exclusion, sedimentation, and adsorption mechanisms. − In addition to its ability to remove turbidity and pathogens, the CWF can produce clear water without changing the flavor or odor of the water. CWF can be fabricated in different geometries, making it flexible for various conditions. − Another advantage of a CWF is its service life of up to 5 years, making it an affordable option for decentralized POU systems …”

“…CWF can be fabricated in different geometries, making it flexible for various conditions. 17 − 19 Another advantage of a CWF is its service life of up to 5 years, making it an affordable option for decentralized POU systems. 20 …”