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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.
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.