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마그네타이트 분말의 표면개질화에 의한 부유물질의 고속 제거
이혁희,박상원 한국환경과학회 2003 한국환경과학회지 Vol.12 No.9
The high speed elimination process of suspended solid was investigated to treat the pulp waste water by using surface modified magnetite particle and magnetic power. The effects of the various aluminum salts such as Al(NO₃)₃ 9H₂O, AICI₃ 6H₂O, Al₂(SO₄) ₃ 13 ~14 on the COD, BOD and suspended solid were systematically studied. It has been found that the 2.0 wt% of Al was most effective for the modification of Fe₃O₄ powder and then best for the treatment of pulp waste water. Optimum quantity of modified magnetite in this study was 12 wt%, and aging time was found to be 12 hours. Comparing with the conventional process, the required time for SS removal was drastically decreased. BOB and COD were also effectively removed when applied to the pulp wastewater.
Rapid Removal of Green Algae by the Magnetic Method
Huk Hee Lee,Hyung Sock Suh,Tae Sun Chang 대한환경공학회 2012 Environmental Engineering Research Vol.17 No.3
This research described the magnetic method for the rapid removal of green algae in water. We modified the pH, cation concentration, and magnetic powder concentration to discover the best removal performance. In order to rapidly remove green algae from water, we added magnetic powder and chitosan into algae water to make a magnetic substance and this was extracted by a strong neodymium magnet. The optimized conditions were pH of 6.5-7.5, chitosan concentration of 10 mg/L, and magnetite powder concentration of less than 0.05%. A higher removing rate was observed when a higher amount of magnetite or chitosan was used, but the total amounts of phosphorus or nitrogen were not decreased.
Rapid Removal of Green Algae by the Magnetic Method
Lee, Huk-Hee,Suh, Hyung-Sock,Chang, Tae-Sun Korean Society of Environmental Engineers 2012 Environmental Engineering Research Vol.17 No.3
This research described the magnetic method for the rapid removal of green algae in water. We modified the pH, cation concentration, and magnetic powder concentration to discover the best removal performance. In order to rapidly remove green algae from water, we added magnetic powder and chitosan into algae water to make a magnetic substance and this was extracted by a strong neodymium magnet. The optimized conditions were pH of 6.5-7.5, chitosan concentration of 10 mg/L, and magnetite powder concentration of less than 0.05%. A higher removing rate was observed when a higher amount of magnetite or chitosan was used, but the total amounts of phosphorus or nitrogen were not decreased.
자전연소합성법을 이용한 비정질 나노 붕소 분말 특성에미치는 첨가제의 영향
주신형,이태혁,조영희,김홍물,이혁희,이종현,Joo, Sin Hyong,Nersisyan, Hayk H.,Lee, Tae Hyuk,Cho, Young Hee,Kim, Hong Moule,Lee, Huk Hee,Lee, Jong Hyeon 한국재료학회 2015 한국재료학회지 Vol.25 No.12
The self-propagating high temperature synthesis approach was applied to synthesize amorphous boron nano-powders in argon atmospheres. For this purpose, we investigated the characteristics of a thermally induced combustion wave in the $B_2O_3+{\alpha}Mg$ system(${\alpha}=1.0-8.0$) in an argon atmospheres. In this study, the exothermic nature of the $B_2O_3-Mg$ reaction was investigated using thermodynamic calculations. Experimental study was conducted based on the calculation data and the SHS products consisting of crystalline boron and other compounds were obtained starting with a different initial molar ratio of Mg. It was found that the $B_2O_3$ and Mg reaction system produced a high combustion temperature with a rapid combustion reaction. In order to regulate the combustion reaction, NaCl, $Na_2B_4O_7$ and $H_3BO_3$ additives were investigated as diluents. In an experimental study, it was found that all diluents effectively stabilized the reaction regime. The final product of the $B_2O_3+{\alpha}Mg$ system with 0.5 mole $Na_2B_4O_7$ was identified to be amorphous boron nano-powders(< 100 nm).