http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박철휘,정태학 ( Chul Hwi Park,Tai Hak Chung ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.3
Operational characteristics of the UASB Process were studied using a l㎥ pilot plant treating wastewater from a starch manufacturing industry. The reactor was operated with a HRT of 8 hours and the temperature was maintained at 35, 30, 25, and 20℃ for a significant period. COD loading rate varied from 7 to 14㎏/㎥-day as a result of fluctuating influent COD concentration. Both COD removal and the gas production decreased gradually as the temperature decreased. However, reduction of the treatment efficiency at low temperatures was not severe at all. Gas production decreased from 0.256㎥ per ㎏ COD removed to 0.191 as the temperature droped from 35℃ to 20℃. VS reduction efficiency also decreased gradually as the temperature decreased. Although slight increase of the volatile fatty acid was observed at low temperatures, stability of operation based upon pH, alkalinity and volatile fatty acid was maintained at all temperatures. It is believed that stable operation at low temperatures is possible due mainly to accumulation of active sludge granules in the reactor. The sludge granules, 0.7 to 1.2㎜ in size, were mostly composed of rod shaped and filamentous microorganisms with a number of pores.
상향류식 혐기성 입상슬러지 공법에 의한 전분폐수의 소화 특성
박철휘,홍승모,허관용,박영재 ( Chul Hwi Park,Seung Mo Hong,Kwan Yong Huh,Young Jae Park ) 한국물환경학회 1994 한국물환경학회지 Vol.10 No.2
The purpose of this study is to develop the advanced and high efficient upflow anaerobic reactor and put in practical use. To achieve this purpose, we built 4 reactors. 25㎥ scale each, and brought the seeding sludge for filling the reactors from K sewage treatment plant. The reactors were designed based on labotary scale reactors performed before and operated with changing the settling compartment and GSS device. During the operation, we came to get the result of DW-process characteristics. The seperation rate of gas and solid was elevated by increasing contact area and R2, R3 and R4 reactor showed good protection efficiency of 30.2, 52.5 and 23.0% from wash-out of sludge. All of 4 reactors gave over 90% COD_(nm) efficiency, 8hr HRT 6-10㎏ COD/㎥/day OLR and over 80% methane content in gas produced in the reactors.
박철휘(Chul Hwi Park) 한국수처리학회 1997 한국수처리학회지 Vol.5 No.3
Due to the complexity of the anaerobic digestion process, representing it with a mathematical model is more difficult than any other process. In these days, mathematical models for the kinetic behavior of the microorganisms for the Upflow Anaerobic Sludge Blanket which maintains high concentration of the microorganisms and settling efficiency by forming granular sludges through the self-immobilization of the microorganisms are being developed. In this research, using the experimental results, the simplified kinetic model of the UASB process is described. The UASB reactor can be divided in three compartments : the sludge bed and sludge blanket, both perfectly mixed with respect to the liquid phase, and a plug flow settling region. The mass balance for the concentration of influent and effluent, biomass concentration and gas production rate in two sludge bed and blanket is established. By this simplified model, simulation and verification is studied using the experimental analysis and data from lab scale and pilot plant. It is investigated that the calculated value is almost fitted to the experimental data and coefficient of temperature effect, the ratio of biomass in the sludge bed and blanket and biological kinetic parameters are appropriated.
침지형 분리막을 이용한 하수의 재이용 및 고도처리공정 최적화 연구
박철휘 ( Chul Hwi Park ),윤재곤 ( Jae Gon Yun ),신우균 ( Woo Kyun Shin ) 한국수처리학회 2004 한국수처리학회지 Vol.12 No.2
This study was conducted to examine the sewage reuse system that was consisted of single aerobic MBR in first test run and MLE MBR system, a kind of BNR process, considering membrane fouling and performance in second test run. The HRT of single aerobic MBR was 2hr, and the effluent quality was good enough for reuse water. And then, the MBR process was transformed into MLE MBR process which was operated with HRT of 4hr (anoxic: 2hr, aerobic: 2hr) from 66th day operation. In that process, removal efficiency of BOD_(5), COD_(Cr), SS, T-N were 96.8%, 88.6%, 98.9%, 55% respectively. Although influent average C/N ratio was 1.93 in MLE MBR process operation, nitrification rate, specific nitrification rate, denitrification rate and specific denitrification rate were 83.35%, 0.07gNH₃-N/gMLVSS·day, 56.92% and 0.06gNO₃-N/gMLVSS·day respectively in overall study period. The recovery rate in MBR process was best when the cleaning interval was 10 minutes with washing mode of 30 sec.
Media 를 이용한 4Stage BNR 운전특성에 관한 연구
박철휘(Chul Hwi Park),정운택(Woon Taeg Jung) 한국수처리학회 2001 한국수처리학회지 Vol.9 No.1
The objective of this study was to investigate the operating condition and the design parameter for the BNR in STP by 4 stage BNR with media. The effulent of primary settler in STP was fed to the pilot plant. The hydraulic retention time(HRT), temperature, COD/TKN ratio and COD/TP ratio were varied to examine the removal efficiency. In the HRT of 10, 8, 6 and 6hr(winter) at media reactor, the removal efficiencies of BOD, COD, SS, TN and TP were 80∼93.9%, 88∼92.7%, 86.2∼92.4%, 41.8∼62.6%, 43.3∼64.4% respectively, and showed the best efficiency at 6hr because of optimim organic loading rate. The media reactor could obtain a stable effulent quality in range of SNR of 1.5∼2.5㎎TKN/gMLVSS·hr by temperature and SDNR 2.2∼3.2㎎NO₃/gMLVSS·hr by COD/TKN ratio and COD/TP ratio due to the biomass.
치근단 감염 치아의 치근단 수술 후 예후에 관한 후향적 연구
김현민,박철휘,이상칠,김동우,박대송,정진환,이슬기,송민석,Kim, Hyeon-Min,Park, Chul-Hwi,Lee, Sang-Chil,Kim, Dong-Woo,Park, Dae-Song,Jung, Jin-Hwan,Lee, Seul-Ki,Song, Min-Seok 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.3
Purpose: The purpose of this retrospective clinical study was to monitor the outcomes of periapical surgery in periapically infected tooth with or without retrograde filling materials (MTA or IRM). Patients and Methods: A total of 85 teeth in 63 patients were included in the study between November 2004 and August 2008. Randomly, MTA or IRM was used as a retrograde filling material or only apical resection without retrograde filling. Teeth with advanced periodontal bone loss or presence of root fracture were excluded from the study. The patients were subjected to a minimum follow-up period of 12 months, with a mean of 17.1 months. Results: Successful healing was observed in 83.3% of the MTA-treated teeth, 80% of the IRM-treated teeth and 75% of the teeth which was not retrograde filling. Doubtful healing was seen 9.3% (MTA), 13.3% (IRM), 12.5% (no retro-filling). The success rate of upper incisors (92%) was higher than lower lincisor and molars (66.7% and 50%, respectively). Conclusion: In this study, periapical surgery including retrograde filling improves the prognosis. And, no statistically significant differences were found between retrograde filling materials (MTA or IRM).