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文亨夫 여수대학교 1989 論文集 Vol.3 No.-
The design of waste treatment facility and the establishment of environmentally-acceptable effluent standards for rivers require that the dilution attributable to natural turbulence be estimated for particular river and particular disposal sites. Dilution of natural-buoyant liquid wastes is achieved by an interaction between turbulent diffusion and differential convection ; the overall process is referred to as dispersion. The objective of this research is to develop an efficient computational model for the prediction of time-dependent mass dispersion in natural streams. The computational model developed in this study is based on a finite-difference solution to the depth-averaged dispersion equation ; the model may be used to predict depth-averaged concentrations resulting from a pollutant source of arbitrary time and space configuration in a stream of arbitrary geometry and nonuniform but steady flow. Problems of numerical instability and damping in the convective stage of the computation are avoided through the use of a half-implicit and half explicit second order differencing scheme for the space derivative ; numerical dispersion cannot be eliminated, but may be minimized by judicious choice of time and distance steps.
文亨夫 國立 麗水大學校 環境問題硏究所 1998 環境硏究論文集 Vol.1 No.-
Field study of pollutants discharged from non-point sources to a natural water channel. A characteristics of discharge of non-point source was tested using data from natural streams in rainfall runoff. Rainfall run-off samples were collected from river. The water surface, water velocity, discharge, COD and SS were measured. COD and SS loads were determined for rural areas of watershed using measured concentration and runoff volumes estimated by the load of non-point source. The run-off of hydrological and pollutants from non-point source were tested on the study site of I-sa River and its major tributaries. The results of the field study were analyzed and presented in this paper.
Enhancde Start-up Operation of Upflow Anaerobic Sludge Blanket Reactors
MOON, Hyoung-Bu 여수대학교 1990 論文集 Vol.4 No.-
UASB reactors treating complex soluble wastewaters with high concentration of proteins and lipids could maintain concentrated sludge through the intermittent withdrawals of effluent during the start-up period. Increased superficial flow rate promoted releasing biogas entrapped in the sludge at high organic loading rate and increased the amount of methane content in the biogas. The upflow liquid velocity was found to affect the growth rate of the granular sludge and the particle size distribution of sludge. Inoculation of powdered activated carbon(PAC) to the seed sludge enhancde the granulation process, but not the COD removal efficiency and the methanogenic activity of sludge.
BOX 모델을 이용한 광양만 유역의 비점오염원 COD 원단위 추정
구자공,김유리,문형부,이우범 한국물환경학회 1993 한국물환경학회지 Vol.9 No.2
Although Kwangyang bay (Chonnam, Korea) had a beautiful landscape, the inner bay had been polluted by the industrial wastewaters and domestic sewage since 1969 of industrialization. During two years from 1989, quality of sea water in the bay was surveyed and using the collected data, this study applied the Box model under the assumption that the water body was completely mixed in each Box. and performed the sensitivity analysis to estimate the effective loading for non-point sources. From summer to early fall, the water quality of the bay showed that the salinity was low and COD was over the environmental criteria. Because the calculated value by the Box model is well satisfied the measured value, it can be used for the predicition of water quality for salinity and COD at the Kwangyang bay. Result showed that the non-point COD unit loadings from farm dry field, paddy field for rice farming, silviculture area and the normal industrial and residential land in Kwangyang bay area are 31.04, 22.38, 4.15 and 383.64㎏ COD/ha-year respectively.