• Journal of Korean Society of Environmental Engineers
• /
• v.29 no.1
• /
• pp.74-81
• /
• 2007

Using the new experimental method named "filtration-permeation", the average specific resistances which plays an important role in designing cake filtration apparatus and the development of cake filtration theory were measured in this study. By this new experimental method, two kinds of average specific resistances are measured. The one from the filtration is named 'filtration average specific resistance $\alpha_{avf}$, and the other from the permeation of particle eliminated water through the pre-formed cake is named 'permeation average specific resistance $\alpha_{avf}$. The "filtration-permeation" method is applied to three different kind of suspensions(i.e. particulate suspension, pre-flocculated suspension and macro-molecule suspension) to obtain filtration and permeation average specific resistances. A theoretical procedure of cake filtration is studied based on the values of permeation average specific resistance. With the study it was concluded that the influence of the sedimentation during particlulate filtration operation could not be ignored as commonly used. And the solid content of suspension, S, which also regarded usually as constant, changes during filtration of particles. It is also verified that the exact value of solid content of cake for floe filtration could not be obtained. These significant problems are all solved by our new "filtration-permeation" experimental method.

• Korea-Australia Rheology Journal
• /
• v.18 no.4
• /
• pp.191-197
• /
• 2006

The measurement of the compressional rheological parameters for an aggregated particulate suspension is described. The parameters include the compressive yield stress and hindered settling function, describing the extent and rate of dewatering respectively. The variation of these parameters with shear rate and time of shear is also considered in the light of their sensitivity to low shear rates, with particular reference to the case of flocculated particulate suspensions. The latter is seen to be important in the future development of a comprehensive understanding of compressive rheology of aggregated particulate suspensions in industrial applications such as thickening, filtration and centrifugation.

• Journal of Korean Society of Environmental Engineers
• /
• v.30 no.2
• /
• pp.161-167
• /
• 2008

Using an experimental method named filtration-permeation, the influence of sedimentation during filtration was studied for the suspensions composed of particles and that of flocs. The average specific cake resistances measured by filtration do not give accurate values because of the sedimentations during filtration, but the permeation data give quite accurate values. The prolonged permeation rates for the cake formed from particulate suspension do not change, but that rate from the floc filtration changes by the sweeping of flocculant. It is proposed that the cake compressibility can be measured with one set of filtration-permeation experiment by step increase of pressure during permeation period. The another experimental method which can shorten experimental time for floc filtration using filtrationpermeation is also proposed.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2016.02a
• /
• pp.150-150
• /
• 2016

Mankind is enjoying a great convenience of their life by the rapid growth of secondary industry since the Industrial Revolution and it is possible due to the invention of huge power such as engine. The automobile which plays the important role of industrial development and human movement is powered by the Engine Module, and especially Diesel engine is widely used because of mechanical durability and energy efficiency. The main work mechanism of the Diesel engine is composed of inhalation of the organic material (coal, oil, etc.), combustion, explosion and exhaust Cycle process then the carbon compound emissions during the last exhaust process are essential which is known as the major causes of air pollution issues in recent years. In particular, COx, called carbon oxide compound which is composed of a very small size of the particles from several ten to hundred nano meter and they exist as a suspension in the atmosphere. These Diesel particles can be accumulated at the respiratory organs and cause many serious diseases. In order to compensate for the weak point of such a Diesel Engine, the DPF(Diesel Particulate Filter) post-cleaning equipment has been used and it mainly consists of ceramic materials(SiC, Cordierite etc) because of the necessity for the engine system durability on the exposure of high temperature, high pressure and chemical harsh environmental. Ceramic Material filter, but it remains a lot of problems yet, such as limitations of collecting very small particles below micro size, high cost due to difficulties of manufacturing process and low fuel consumption efficiency due to back pressure increase by the small pore structure. This study is to test the possibility of new structure by direct infiltration of SiC Whisker on Carbon felt as the next generation filter and this new filter is expected to improve the above various problems of the Ceramic DPF currently in use and reduction of the cost simultaneously. In this experiment, non-catalytic VS CVD (Vapor-Solid Chemical Vaporized Deposition) system was adopted to keep high mechanical properties of SiC and MTS (Methyl-Trichloro-Silane) gas used as source and H2 gas used as dilute gas. From this, the suitable whisker growth for high performance filter was observed depending on each deposition conditions change (input gas ratio, temperature, mass flow rate etc.).