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김종부,신명국,성낙환,최문정,김경주,이동석 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A
This experiment was done to investigate the leaching and adsorption properties of heavy metals on porphyry. The comparison with respect to the leachability of heavy metals from porphyry between the Korea Standard Leaching Test (KSLT) and the Toxicity Characteristic Leaching Procedure (TCLP) was carried out. The fractional composition of leachate and the total concentration of heavy metal of porphyry were studied through Sequential Extraction Procedure (SEP) and EPA Method 3050. Adsorption experiment of porphyry has pointed out that the optimum dosage of porphyry for 50ppm Pb was over 10g/L, the effective particle size for absorption was below 200 mesh and the optimum pH was about 7. From the Freundlich' adsorption equation, l/n was 1.0722, and k was 0.0041. After adsorption, the fractional composition of Pb was changed. The exchangeable, carbonate, reducible fractions were increased, and the organic fraction was not changed, and the residual fraction was decreased.
Microbiological Purification of L-Arabitol from Xylitol Mother Liquor
( Ming Guo Jiang ),( Ben Wang ),( Li Fang Yang ),( Shuang Jun Lin ),( Hai Rong Cheng ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.1
As a rare sugar alcohol, L-arabitol can be used in food and can prevent extra fat deposits in the intestinal tract. Commercially, L-arabitol is prepared from pure L-arabinose by hydrogenation, which needs a high temperature and high pressure, leading to a high production cost for Larabitol. Therefore, this study describes a novel L-arabitol production method based on biological purification from the xylitol mother liquor, a cheap and readily available raw material that contains a high concentration of Larabitol. First, a novel Bacillus megaterium strain was screened that can utilize xylitol, sorbitol, and mannitol, yet not L-arabitol. The isolated strain was inoculated into a medium containing the xylitol mother liquor under formulated culture conditions, where a high L-arabitol yield (95%) and high purity (80%) were obtained when the medium was supplemented with 50 g/l of xylitol mother liquor. Upon further purification of the fermentation broth by ion exchange and decolorization, L-arabitol was crystallized with a purity of 98.5%.
The influence of water level and flow rate on vortex occurrence in pump sump
Ming Guo,최영도 한국마린엔지니어링학회 2019 한국마린엔지니어링학회지 Vol.43 No.2
A pump sump is an indispensable facility in cargo ships, irrigation, drainage, agriculture and industrial processes. The water intake conditions around suction bell mouth significantly affect the performance of the whole pumping system. However, there are different types of undesirable vortices that occur in pump sump, such as submerged vortex and air entraining vortex. Accompanying with the variety of vortex, noise and vibration also appears. In this study, a scaled down model of a pump sump was designed and constructed. The occurrence of the vortex was the concentrated target which was investigated under various suction pipe inlet conditions. With different water levels, flow rates and a fixed distance from the bottom to suction pipe bell mouth, detailed experiments were conducted. Additionally, a computational fluid dynamics (CFD) analysis was performed, verifying the influence of water level and flow rate on visualization and formation of vortex obtained in the experiment. The CFD analysis results were compared with those of the experiment.