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류근갑,노석용 ( Keun Garp Ryu,Seok Yong Rho ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.6
The pretreatments of kraft pulp with an alkaline xylanase and a peroxidase were studied to enhance the bleaching efficiency. Xylanase was most effective in a buffer solution of pH 9. The pretreatment of kraft pulp with xylanase for more than 3 hours at 40℃ resulted in a sufficient bleaching effect. The pretreatments of kraft pulp with the simultaneous use of xylanase, peroxidase, H₂O₂(0.1 mM), and a phenolic compound(1 mM) increased the bleaching efficiency as compared to the pretreatments with xylanase only. Guaiacol was most effective among the phenolic compounds used. Results from scaled-up pretreatments(5 L reactor) of kraft pulp showed that xylanase and peroxidase can lose their activities by the shear force caused by the agitation of the pulp solution. Intermittent addition of H₂O₂, guaiacol, and peroxidase, in this turn, resulted in the best bleaching efficiency of kraft pulp. In this case the kappa number of kraft pulp decreased from the initial value of 18.25 to 9.62 after the enzymatic pretreatment followed by an alkaline extraction in a 0.5 N NaOH solution. Enzymatic pretreatments of kraft pulp enhanced the alkaline extraction efficiency to a great extent.
효소반응을 이용한 폐수속의 페놀제거 : 금속이온이 Peroxidase 에 의해서 생성된 페놀침전물의 침강에 미치는 영향
류근갑(Keun Garp Ryu),권상욱(Sang Wook Kwon),김영태(Young Tae Kim) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
The use of metal ions was studied for the efficient sedimentation of phenolic precipitates which were formed by peroxidase and H₂O₂ in aqueous solutions. Over 80% of phenol was removed from aqueous solutions by enzyme reactions using peroxidase and H₂O₂followed by centrifugation. Adding metal ions, Al^(3+), Fe^(2+), Fe^(3+), Cu^(2+) to a solution containing phenolic precipitates increased the sedimentation efficiency of the phenolic precipitates. The use of Fe^(3+) ion over 0.1 mM was most effective for the sedimentation of the phenolic precipitates.
생물화공 에너지 / 환경 / 섬유소분해효소에 의한 중규모 고급폐지재생 탈묵공정
이상목(Sang Mok Lee),류근갑(Keun Garp Ryu) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3
Enzymatic deinking of office-waste paper was studied using crude cellulose and papain-hydrolyzed cellulose from Trichoderma reesei Rut C-30 in small-scale and mid-scale. The results were compared with deinkings using commercial enzyme(Novozym 342) and conventional chemical methods. Maximum brightness and freeness were obtained at 3 units/g Oven Dry Paper(ODP) of CMCase activity using crude cellulose in mid-scale deinking experiments. The deinked pulp had higher physical strength and brightness, and lower freeness and yield than the pulp deinked in small scale. In small scale deinking, maximum brightness and freeness were obtained at 2 unit/g ODP Deinking by papain-hydrolyzed cellulose showed similar results with those by Novozym 342. It was better in brightness and freeness, but showed lower physical strength and yield, than the conventional deinking by sodium hydroxide. The ratio of endo-l,4-glucanase and exo-l,4-glucanase components in papainhydrolyzed cellulose from Trichoderma reesei Rut C-30 was similar to that of commercial enzyme, Novozym 342, implicating a successful application as a deinking enzyme.