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고정상 생물막 반응기를 이용한 DMSO 함유폐수의 처리
신정훈 ( Sin Jeong Hun ),정진영 ( Jeong Jin Yeong ),정윤철 ( Jeong Yun Cheol ),손대희 ( Son Dae Hui ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.5
The objective of this study was to investigate the performances of the activated sludge and fixed-film biological reactor in treating industry wastewater containing dimethyl sulfoxide [DMSO, (CH₃)₂SO]. When the influent DMSO concentration increased from 400 ㎎/L to 800 ㎎/L at hydraulic retention times from 48 to 24 hours, the soluble TOC removal efficiencies of the activated sludge and fixed-film reactors were in the range of 95.3-97.5% and 96.5-97.6% respectively. Meanwhile, the TCOD removal efficiency of the activated sludge was in the range of 80.5-98.0%. while that of the fixed-film reactor was 94.9-98.5%. The reason for the high fluctuation of TCOD removal in the activated sludge process was the increase in the SS concentration in the effluent. The sludge washout was caused by the destruction of sludge floc due to the DMSO concentration in the suspended culture. However, the fixed-film reactor showed a stable effluent quality compared to that of the activated sludge reactor during whole operating period.
비자성 유도가열시스템을 위한 IGBT를 이용한 고속스위칭 구동에 관한 연구
김정태(kim Jeong-Tae),권경안(Kwon Kyung-Ahn),정윤철(Jung Yun-Cheol),박병욱(Park Byoung-Wook) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
A new high frequency switching drive method using IGBT is proposed for non-magnetic induction heating system, Using this method, the switching and conduction losses of the switching devices can be reduced. In addition, since IGBT cost is lower than MOS-FET one, the system cost can be remarkably pared down. The prototype induction heating system with 1.2㎾ power consumption is builted and tested to verify the operation of the proposed high frequency switching drive method.<br/>
손대희 ( Son Dae Hui ),정윤철 ( Jeong Yun Cheol ),유명진 ( Yu Myeong Jin ),정진영 ( Jeong Jin Yeong ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.1
Zeolite is well known material for its ability to preferentially remove ammonium ions from wastewater. However, its usage has been limited by high cost for chemical regeneration on this purpose. As an alternative, biological regeneration of zeolite has been suggested by some researchers. In this study, the characteristics of biological regeneration of zeolite was studied at various conditions, i.e. changes in microorganism and Na^(+) concentration. In the first test, the percentage of bio-regeneration via nitrification in the columns(MLVSS 2,250㎎/ℓ and 4,500㎎/ℓ) was 2.6 times higher than the column with NaHCO₃(2M980 ㎎/ℓ) addition only. In the second test MLVSS were changed(400, 800 and 3,200㎎/ℓ) but, for alkalinity supply, NaHCO₃ concentration was fixed at 745㎎/ℓ. The regeneration rates were proportional to the MLVSS concentration, but the same amounts of total regenerated nitrogen were achieved in all columns tested. In the third, test the regeneration tests were performed to evaluate effects of Na^(+) concentration on regeneration were tested. The regeneration effficiency was enhanced about 5% when Na^(+) concentration increased from 342 to 734㎎/ℓ. There was no difference in regeneration rate by nitrification. Therefore the higher regeneration efficiency of zeolite could be obtained by nitrification than by chemical methods. The regeneration rates with the fixed Na^(+) concentration were proportional to nitrification rate, and the regeneration efficiencies with the fixed microorganism concentration were highly dependent on cation concentrations such as Na^(+)
천연 제올라이트가 충전된 SBBR을 이용한 암모니아성 질소 함유 폐수처리
손대희 ( Son Dae Hui ),정윤철 ( Jeong Yun Cheol ),유명진 ( Yu Myeong Jin ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.4
Continuous experiments in laboratory scale SBBR(Sequencing batch biofilm reactor) with granular natural zeolites were conducted to investigate the effect of ammonium removal and regeneration by ion-exchange and nitrification. The proposed process used the ion exchange material as the media for the nitrifying and denitrifying biomass. The entire process was carried out in a single reactor. The SBBR type of three reactors were prepared for comparison of removal of nitrogen, organics and phosphorus. The first (modified Zeo-SBBR) and the second(Zeo-SBBR) reactors were filled with granular zeolite, and the third(A.C-SBBR) with granular activated carbon. Modified Zeo-SBBR and A.C.-SBBR were operated in new mode ; fill, mix, drain, backwash, and aeration, and Zeo-SBBR in conventional mode ; fill, mix aeration, backwash, and drain. The synthetic wastewater having 200㎎/L of NH₄^(+) was tested in this process. Results of this experiment were that modified zeo-SBBR showed the highest nitrogen removal efficiency. Total nitrogen removal efficiency showed 94%(modified zeo-SBBR), 75% (zeo-SBBR) and 79% (A.C-SBBR) respectively. In the case of modified zeo-SBBR, nitrogen removal was effectively enhanced by ion-exchange of the zeolite. And the zeolite saturated by ammonium was continuously regenerated by nitrification without a regeneration chemical such as NaCl. The results support that the proposed nitrogen removal process is very effective for treating ammonium bearing wastewater.
서주완(Joo Wan Seo),김현성(Hyun Sung Kim),박태영(Tae Young Park),송병준(Byung Joon Song),정윤철(Yun Cheol Jeong),김종진(Jong Jin Kim),천정훈(Jung hoon Chun),정영태(Young Tae Jung) 한국화재소방학회 2022 한국화재소방학회 학술대회 논문집 Vol.2022 No.추계
최근 짓는 건물은 고층화, 대형화로 점점 복잡해지고 있으며, 화재하중도 높아 고층건물의 연소 확대 방지를 위해서는 연결송수관설비를 활용한 진압전술이 필요하다. 2022년 소방청 통계연보 소방장비 현황에 의하면, 소방서의 화재진압차종은 소방펌프차, 소방물탱크차 등이며, 화재를 진압하는 대다수의 소방차는 A-1소방펌프(규격방수압력 0.85 MPa의 규격방수량 2.8 ㎥/min이상, 고압방수압력 1.4 MPa의 고압방수량 2.0 ㎥/min이상)을 사용한다. A-1소방펌프의 특징은 우햐항 펌프성능시험곡선을 가진다. 본 연구에서는 고층건물 화재 시 건물 연결송수관설비 가압송수장치(증압용 펌프)가 작동하지 않는 상황을 가정하여, 소방차 1대 고압방수압력(1.4 MPa, 1.6 MPa) 단독방수와 소방차 2대를 직렬로 중계(2대 동일 특성이 같은 A-1펌프 사용, 2대 특성이 다른 펌프 사용)하고, 소방펌프 2대의 압력변화를 다양하게 하면서 소방차 1대 단독방수일 경우와 압력유량 값을 비교하였다. 실험결과 고압방수압력(1.4 MPa, 1.6 MPa)에서 소방차 2대의 특성이 같은 펌프와 특성이 다른 펌프 모두 압력과 유량이 소방차 1대 단독방수보다 높았다. 단독방수 시 방수구를 막고, 압력상승 후 1.4 MPa, 1.6 MPa로 개방하였을 때 실질적으로 방수압력이 급격히 떨어졌다. 소방펌프중계효율은 중계차(방수하는 차로 물을 보내주는 차)와 방수차(물을 직접 방수하는 차)의 압력편차가 크거나, 중계차의 압력이 방수차보다 상대적으로 낮을 때 중계효율이 낮았다. 따라서, 고층건물 화재 시 또는 훈련 시에 건물 송수압력 범위를 확인하고, 1.4 MPa이상 시 소방차 2대를 각각 규격방수압력 부근에서 압력편차를 적게 한 중계방수가 필요함을 제시한다.