http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이수구,전명순,최기덕 서울産業大學校 1991 논문집 Vol.34 No.1
This study was performed to find the effect of nutrients on the biological treatment of synthetic wastewater, paper industrial wastewater, pharmaceutical wastewater, municipal sewage and tannery wastewater. The composite nutrients were used such as defluorided phosphoric acid, MAP (monoammonium phosphate), MAP crystal, DAP(diammonium phosphate) which were produced in Jinhae Chemical Co. These nutrients were compared with basal salt medium, urea and phosphoric acid. Balance of nutrients and pH control were the important parameters in the biological treatment of synthetic and industrial wastewater. In order to improve removal efficiency of organic materials, MAP crystal and DAP as nutrients were found to be effective for the paper, pharmaceutical and tannery wastewater and these contained sufficient nutritive substances especially nitrogen and phosphate. In the paper wastewater COD removal efficiency could be attained to 60% with DAP at aeration time 15 hr, while it was no more than 40% without nutrient. In the pharmaceutical wastewater, COD removal efficiency was 80% with nutrients and 40% without nutrient. In the biological treatment of tannery wastewater, MAP crystal was the most effective nutrient, COD removal efficiency could be attained up to 82% while 37% in the control system without nutrients.
이기택, 최기덕, 이은비, 유성환 가톨릭관동대학교 대원환경연구소 2018 보건환경연구논문집 Vol.23 No.-
esearch to find out the efectivenes of sorbent solutions by using sorbent for household water waste filters that are discarded for countries where even heavy water is dificult to use worldwide. Among the types of sorbent, we used sulphur soil, large particle activated carbon, smal particle activated carbon, and sand, and we examined the treatment eficiency of each filter through BOD, T-N, T-P and SS experiments.
190-m Heliox 해상 포화잠수에서의 수면패턴과 하루주기리듬
서유진,최기덕,松本一?,문세근,장영민,김보선 대한인간공학회 2006 대한인간공학회 학술대회논문집 Vol.- No.-
The purpose of this study is to examine sleep structure and circadian rhythmicity under the hyperbaric environment to obtain fundamental data so that a desirable sleep environment for divers may be organized using actigraphy. The actigraph activities were measured over a period of 55 nights under a He?O₂ opensea hyperbaric saturation dive to 20 ATA with excursions to 21 ATA. Individual time series were analyzed according to autocorrelation function, fast fourier transform, and power spectrum analysis (PSA) using wrist actigraphy, in order to estimate the prominent circadian period (tau=24-h) and to evaluate each days differences. The autocorrelation function for the time series of each day showed significant circadian rhythmicity with circasemidian rhythmicity (tau= about 12-h) except the 1st day of the bottom period. The PSA for the time series of each day showed significant, about 25-h circadian rhythmicity with circasemidian rhythmicity, on the 1st, 2nd, and 5th days of the decompression period. The 2nd day of the bottom period showed a significant circadian rhythmicity with circasemidian rhythmicity, about 26-h. The results of FFT showed similar changes to the autocorrelation function.
영양제로서 결정 NH₄H₂PO₄를 첨가한 피혁 공장 폐수의 생물학적 처리
전명순,임병란,최기덕,이수구 서울산업대학교 산업대학원 1993 大學院論文集 Vol.2 No.-
피혁 공장 폐수의 생물학적 처리에 있어서 유입 폐수의 급격한 부하변동, 독성물질의 유입 및 미생물의 성장에 필요한 각종 영양소의 불균형 등으로 인해 처리효율이 낮고 운전관리상 어려움이 많다. 따라서 본 연구에서는 피혁공장 폐수의 생물학적처리효율을 높이기 위하여 각종 영양제의 주입에 따른 처리효과에 관한 실험을 실시하여 적절한 영양제를 선정하고, 최적 주입량 등을 결정 하였다. 실험대상 폐수는 반월공단내의 피혁 공단 폐수로서 중화 및 응집참전 밥법으로 전처리 한 후 포기조에 유입되는 폐수를 대상으로 하였다. 영양제로는 회분식 실험에서 피혁폐수의 처리효율이 가장 우수한 것으로 나타난 결정 APM (ammonium phosphate monobasic, NH₄H₂PO₄)을 이용하였다. 연속식 활성 슬러지 공장에 있어서 폐수의 유량, 슬러지 반송율, 결정 APM 주입량 등을 변화시켜 그에 따른 처리효율에 미치는 영향을 실험 고찰하였으며, 생물 반응공학적인 반응해석을 통하여 설계에 필요한 반응상수 등을 구하였다. 연속식 활성슬러지법에서체류시간 12시간의 조건에서 영양제 미주입시 BOD 제거효율은 68%에 불과하였으나, 영양제로서 요소와 인산을 주입한 경우 73%로 증가하였으며 결정APM을 주입한 경우 90% 이상의 높은 처리율을 얻을 수 있었다. 결정 APM의 최적 주입량은 회분식 실험의 경우 300㎎/L이었으나, 연속식 실험의 경우 50㎎/L로 낮게 나타났는데, 이는 반송되는 슬러지내의 높은 인농도와 미량원소에 기인한다. 결정 APM을 50㎎/L 주입한 후 수리학적 체류시간을 6∼30 시간의 범위로 변화시켜 실험한 결과, BOD 제거효율은 체류시간 6시간에서는 67%에 불과하였으나, 12시간의 경우 93%, 30시간의 경우 98%이었다. 따라서 BOD제거효율 90%이상을 얻기 위해서는 수리학적 체류시간은 11시간 이상, F/M비는 0,65 ㎏ BOD/㎏ MLVSS·d 이하로 운전하여야 하는 것으로 나타났다. This study was performed to enhance the treatment efficiency of leather wastewater adding APM(ammonium phosphate monobasic, NH₄H₂PO₄) crystal as nutrient which contained the sufficient mineral components. The effect of APM crystal on biological treatment were studied and its optimum dosage and kinetic coefficients were determined. In the continuous activated sludge system for field wastewater of Banwol leather complex, BOD removal efficiency could be obtained over 90% with adding APM crystal, while it was 68% without nutrients and 73% with urea and phosphoric acid in the condition of HRT 12hr and SRT 3 days. The optimum dosage of APM crystal was 50㎎/L which was low compared with 300㎎/L in batch test due to recycling sludge contained high content of phosphate and mineral nutrients. In the condition of adding APM crystal 50㎎/L and hydraulic retention time in the range 6∼30hr, BOD removal efficiencies were 67% for HRT 6hr, 93% for 12hr and 98% for 30hr. In order to obtain over 90% of BOD removal efficiency, HRT should be maintained over 11 hr and F/M ratio within 0.65 ㎏ BOD/㎏ MLVSS·d.