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충전부상탑모델을 이용한 오염토양입자의 선별적 분리의 평가
박규홍 中央大學校 建設環境硏究所 1995 環境科學硏究 Vol.6 No.-
Flotation is a relatively effective and economic method for selectively separating fine particles in liquid. This study was performed to apply the flotation process to the pretreatment of the contaminated sediments in rivers or estuaries for the purpose of reduction of the volume to be treated. Sensitivity analysis was conducted to examine the effect of several operating conditions as independent variables on the performance of flotation separation, e. g., recovery and removal efficiency of contaminants, grade of uncontaminated soil. Utilization of these results can be helpful to the design and operation of the actual flotation experimental tests.
EXPERIMENTAL EVALUATION ON REFLUX ENHANCED PERFORMENCE USING PACKED FLOTATION COLUMN
박규홍 中央大學校 建設環境硏究所 1994 環境科學硏究 Vol.5 No.-
Flotation experiments were performed using packed column to investigate the influence of air flowrate, surfactant dose, column section lengths, and reflux ratio on the recovery and grade. Especially, the potential of the reflux enhanced flotation was examined comparing with the performance of non-reflux flotation. The use of reflex in column flotation showed some improvement of grade for selected test. When compared with other processes, packed flotation column produced grade/recovery that may approach release analysis.
김한용,박규홍 中央大學校 建設環境硏究所 2002 環境科學硏究 Vol.13 No.2
본 연구에서는 회전원판공정에서 Polypropylene 재질의 평판, 파형판, 요철판, 그리고 SUS 재질의 네트판 등 각기 다른 원판표면형태에 따른 질산화 특성을 조사하였다. 본 연구에 사용된 원수는 수리학적 부하 205ℓ/㎡·day, SBOD_5 98.2±10.8mg/ℓ, CODcr 197.5±36.5mg/ℓ, NH_4^+-N 22.0±2.9mg/ℓ, 그리고 NO_3^--N 0.5±0.4mg/ℓ인 일반적인 하수를 대상으로 각기 다른 여재를 사용한 회전원판 공정을 이용하여 연구를 수행하였다. 그 결과 유기물 제거율은 원판표면의 조도가 클수록 제거율이 약간씩 높은 것으로 나타냈다. 암모니아성 질소 제거의 경우 평판, 파형판, 요철판이 거의 동일한 제거율을 보이고 있으며, 네트판은 그 차이는 크지 않지만 다른 원판에 비해 우수한 제거율을 나타낸다. 질산성 질소 제거 측면에서도 네트판이 다른 원판에 비해 약간은 우세함을 보이고 있다. 그러나 네트판의 경우 여재의 중량감과 그로 인한 기계적인 문제점, 유출수의 악화 등을 유발할 가능성이 있으며, 요철판과 파형판의 경우 평판과 거의 동일한 제거율을 나타내므로 제작이 용이하고 경제적인 평판이 질산화에 가장 적합한 원판표면형태로 판단된다. The purpose of this study was to investigate the characteristics of nitrification in rotating biological contactors (RBCs) using several disc forms. Pilot-scale RBCs equipped with four different discs were operated using municipal sewage of the constant hydraulic load of 205ℓ/㎡·day, 98.2±10.8mg/ℓ of SBOD_5, 197.5±36.5mg/ℓ of CODcr, 22.0±2.9mg/ℓ of NH_4^+-N, 0.5±0.4 mg/ℓ of NO_3^--N. The removal efficiency of SBOD_5 was slightly increased as the roughness of the suface of the discs was increased. For the flat disc, ripple disc, and sand-blasted disc, the removal efficiencies of NH_4^+-N did not show significant difference while the removal of NH_4^+-N for the netty disc was slightly improved. Compared with the other discs, the netty disc showed a little improved removal efficiency for the NO_3^--N as well. Since the netty discs can cause a mechanical trouble resulting from the excessive weight of attached biomass and aggravation of effluent quality, however, the flat discs relative to the ripple discs and sand-blasted discs could be advantageous with respect to the manufacturing and cost-effectiveness.
강병준,유순유,박규홍,Kang, Byongjun,Yoo, Soonyu,Park, Kyoohong 대한상하수도학회 2020 상하수도학회지 Vol.34 No.4
Sewer deterioration models are needed to forecast the remaining life expectancy of sewer networks by assessing their conditions. In this study, the serious defect (or condition state 3) occurrence probability, at which sewer rehabilitation program should be implemented, was evaluated using four probability distribution functions such as normal, lognormal, exponential, and Weibull distribution. A sample of 252 km of CCTV-inspected sewer pipe data in city Z was collected in the first place. Then the effective data (284 sewer sections of 8.15 km) with reliable information were extracted and classified into 3 groups considering the sub-catchment area, sewer material, and sewer pipe size. Anderson-Darling test was conducted to select the most fitted probability distribution of sewer defect occurrence as Weibull distribution. The shape parameters (β) and scale parameters (η) of Weibull distribution were estimated from the data set of 3 classified groups, including standard errors, 95% confidence intervals, and log-likelihood values. The plot of probability density function and cumulative distribution function were obtained using the estimated parameter values, which could be used to indicate the quantitative level of risk on occurrence of CS3. It was estimated that sewer data group 1, group 2, and group 3 has CS3 occurrence probability exceeding 50% at 13th-year, 11th-year, and 16th-year after the installation, respectively. For every data groups, the time exceeding the CS3 occurrence probability of 90% was also predicted to be 27th- to 30th-year after the installation.