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질소와 암모니아 존재하에서 1 keV 에너지의 알곤과 수소 이온 조사에 의한 PTFE(polytetrafluoroethylene)의 표면형상 변화연구
유대환,김기환,강동엽,김중수,고석근,김현주,Yeu, Dae-Hwan,Kim, Ki-Hwan,Kang, Dong-Yeob,Kim, Joong-Soo,Koh, Seok-Keun,Kim, Hyun-Joo 한국재료학회 2006 한국재료학회지 Vol.16 No.6
Polytetrafluoroethylene (PTFE) surface was modified for improving hydrophilicity by ion irradiation in environmental gas of $N_2$ and $NH_3$, respectively. The water contact angle onto the PTFE surface increased from $104{\circ}$ to over $140{\circ}$ by Ar ion irradiation in $N_2$ gas. In the case of $NH_3$ as environmental gas, there were a slight increase of contact angle from ion dose of $1{\times}10^{15}\;to\;5{\times}10^{15}\;ions/cm^2$, and its dramatic decrease to the value of 35o at the conditions of ion dose higher than $1{\times}10^{16}\;ions/cm^2$. It was found from SEM results that the surface morphology of PTFE was changed into one with filament structure after Ar ion irradiation in $N_2$ gas environments. On the contrary, Ar ion irradiation in $NH_3$ gas condition induced the PTFE surface with network structure. Hydrogen ion irradiation resulted in a little change of PTFE surface morphology, comparing with the case of Ar ion irradiation. The water contact angle of hydrogen ion irradiated PTFE surface in reactive gas decreased with increment of ion dose. Hydrogen ion irradiation could improve hydrophilicity with little change of surface morphology. It might be considered from FT-IR results that the improvement in wettability of PTFE surface by ion irradiation in $N_2$ and $NH_3$ gases could be due to the hydrophilic groups of NHx bonds.
DPB를 포함한 5 - Stage BNR 공정을 이용한 생물학적 질소 , 인 제거
유대환(Dae Hwan Rhu),박종복(Jong Bok Park),이재진(Jae Jin Lee),이원권(Won Kwon Lee) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.1
The biological nutrient removal from wastewater with low C/N and C/P is difficult. This study was carried to remove nitrogen and phosphorus from wastewater by using the 5-stage BNR process with denitrifying phosphorus removing bacteria(DPB). The 5-stage BNR process could achieve stable phosphorus and nitrogen removal with less substrate consumed. These laboratory experiments revealed that step feed with DPB showed a possibility of biological nitrogen and phosphorus removal from low organic municipal wastewater. With DPB, specific denitrification rate was 1.3 ㎎NO₃-N/gVSS/hr and specific phosphorus utilizing rate was 2.0 ㎎SP/gVSS/hr.