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미생물산 고분자를 이용한 활성슬러지 효율증진에 대한 연구
박대원,정윤철 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
A experiment was conducted to monitor the change of treatment efficiency in a activated sludge tank when the microorganism producing polymer was added. Z.ramigera, a microorganism which produce polymer in the activated sludge tank, was cultured to produce the polymer. Once a day the microorganism producing polymer was added to the activated sludge tanks, R-l, R-2, R-3, at the concentration of 0, 10, 100 mg/l, respectively, based on dry weight. Effluents from the activated sludge tanks were analyzed and compared. Total chemical oxygen demand (TCOD) removals in R-l, R-2, R-3 were 78%, 82%, 85%, respectively. The activated sludge tank where microorganism producing polymer was added showed higher removal rate of organic substance. Suspended solid(SS) removal was 77% in R-l. However 89% and 95% of SS removals were obtained in R-2 and R-3, respectively, where microorganism producing polymer acted as a coagulant. When organic loading to an activated sludge tank is increased, sludge bulking is often observed. To investigate the effect of microorganism producing polymer addition under the operating condition leading to sludge bulking, TCOD concentration in the influent was increased from 145 mg/l to 200 mg/l. The treatment efficiency of R-l decreased. However those of R-2 and R-3 increased. After organic loading was increased, sludge bulking was observed in R-l. Good sludge setllability was achieved in R-2 and R-3.
고정상 생물막 공법을 이용한 상수원수 전처리에 대한 연구
박대원 ( Dae Won Pak ),김동건 ( Dong Kun Kim ),장원석 ( Won Seak Chang ),고창일 ( Chang Il Koh ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.6
We performed the tests using two different mada(R1-bioball. R2-bioball) fixed biofilm reactors, investigated the efficiencies as pretreatment of drinking water, and identified the connecting possibilities of membrane treatment as posttreatment. As results of 100 days monitoring under different HRT (2, 4, 6 hr), organic compound removal of two reactors showed 38.5 % and 34.3 % in spite of increasing 8 to 10 times of loading rate, the color, turbidity, and chloropyll-a also showed higher removal 78.0 % to 94.9%. Therefore, the application of fixed biofilm is proved effective pretreatment process of removing color, turbidity, algae (chloropyll-a) as well as organic compounds. And also, as results of connecting possibility with membrane process (UF and NF). TOC and turbidity removals in UF system showed 45.4% (R1) and 40.2 % (R2); 98.5 % (R1) and 98.3% (R2), respectively, those in NF system showed 59.4% (R1) and 53.4 % (R2); 99.2 % (R1) and 99.1 %, respectively. In spite of conventional drinking water treatment system, combination of fixed biofilm and membrane system would be used to water purification system on pretreatment and posttreatment.
CERTAIN INFINITESIMAL TRANSFORMATIONS ON QUATERNIONIC KA¨HLERIAN MANIFOLDS
PAK, JIN SUK,YOON, DAE WON 경북대학교 위상수학 기하학연구센터 1999 硏究論文集 Vol.8 No.-
In the present paper, we study conformal and projective Killing vector fields and infinitesimal Q-transformations on a quaternionic Ka¨hlerian manifold, and prove that an infinitesimal conformal or projective automorphism in a compact quaternionic Ka¨hlerian manifold is necessarily infinitesimal automorphism.
ON NULL SCROLLS SATISFYING THE CONDITION ${\triangle}$H = AH
Pak, Jin-Suk,Yoon, Dae-Won Korean Mathematical Society 2000 대한수학회논문집 Vol.15 No.3
In the present paper, we study a non-degenrate ruled surface along a null curve in a 3-dimensional Minkowski space E31, which is called a null scroll, an investigate some characterizations of null scrolls satisfying the condition H=AH, A Mat(3, ), where denotes the Laplacian of the surface with respect to the induced metric, H the mean curvature vector and Mat(3, ) the set of 3$\times$3-real matrices.