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폐타이어 담체가 충전된 유동상 생물막법을 이용한 도시하수 처리
송준상,문형극,이홍근 ( Jun Sang Song,Hyung Keuk Moon,Hong Keun Lee ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.3
Samkwang Aqua-Clear, Inc. has developed the fluidized bed biofilm method using the SAC Bio-Carrier made of waste tire powder and called Bio-SAC Process. The removal rate of organic matter of this method can treat the wastewater 4 times faster than the conventional activated sludge method and it has specially designed aerobic bio-reactor filled with 20% SAC Bio-carrier of the volume of reactor. We have done the application research for the municipal sewerage treatment and the results are summarized as follows: The removal rate of biochemical oxygen demand(BOD) and chemical oxygen demand(COD-Mn) was around 90% and the Hydraulic retention time(HRT) of the aerobic bio-reactor is 1.5 hours. Although the suspended solids(SS) concentration of raw water was very high and varied widely because this method has no primary sedimentation tank, its concentration of the effluent is only around 10㎎/L. Also nitrification reaction was occurred and the removal rate of total kjeldahl nitrogen(TKN) was around 80% during the short HRT. The removal rate of total phosphorus was around 70% with chemical coagulation process using the alum and polymer. Its rate was higher than that of the conventional activated sludge method. The bio-film microorganism grew abundantly on the surface of the SAC Bio-carrier. Epistylis spp. was observed as a predominant species, and the depth of the biofilm was 0.3∼1.0㎜. This species is one of the peritrichita that grow well in the aerobic reactor at the good treatment condition. The treatment coefficient(T₁) of Bio-SAC^R process from the Grau`s multicomponent degradation model was four times higher than that of the activated sludge method. This SAC treatment method can not only reduced the 50% of the building area of the wastewater treatment plant, but also reduced the 20% of the capital cost. Because the removal rate of the total phosphorus is much higher than the activated sludge method, this treatment method is more effective process as the tool of the prevention method for the point source control of the eutrophication.
安領美(Ryong Me Ahn),李弘根(Hong Keun Lee) 한국환경보건학회 1984 한국환경보건학회지 Vol.10 No.1
The stochastic characteristics of the daily range of water temperature variation was analyzed by employing the techniques of autocorrelation coefficient, autoreggresive model and crosscorrelation model. These time series inc1uded dai1y observations on maximum and minimum values of water temperature and air temperature. The measurement was made.by automatic recording instrument at Gu-yee and Dook-<io in Han River, and at Waegwan and Gu-mi in Nackdong River in 198 1. As a result of this study, it was found that (1) The correlogram of daily water temperature ranges AAT j and daily air temperature l:!,ATj at Gu-mi and Gu-yee showed the exponential curves. (2) The most high frequency valuesof l:!,ATj and l:!,WTjwere l1 Y C and O.5 Y C respectively at every measuring site. (3) The correlation coefficients between the daily mean air temperature ATj and the dai1y mean water temperature were fairly high as 0.966 at Dook-do and 0.949 at Gu-yee, but the correlation coefficients between l:!,ATj and l:!,WTj were very low as 0.1074 at Gu-yee and 0.0324 at Dook-Do. (4) It was analyzed that the most adequate autoregressive model of the four types were 父j + 1 v ~ _ 2 \Y.z_ ... ____ _1 __ -...:1_ C. _ ,7 (I - PI)X + p, Xj + P (I - p, ) Ej type at Gu-yee and Dook。, and Xj + 1 =(l -p,)X+ p 1 Xj +P (1 一p, 2)V2 Ej type at Waegwan and Gu-mi. (5) The most adequate simple regressive model of the four types for predicting l:!,WT j was Y =(1 - r)Y + r Xj + (1 - r2 )V2 Ej at Gu-yee and Dookφ in the view of matching the vz probability denslty function of 0nal time series, and Y = (1 - r)Y + r ~ Ej type or Y =(1 - r)Y + ‘ + 0, (1 - r2 )1/2 type at each site in the view of closing to the mean value of UX the original time series.
염색폐수의 수질독성시험을 이용한 한국의 수질배출허용기준 평가연구
김영희,이민정,최경호,어수미,이홍근,Kim, Young-Hee,Lee, Min-Jung,Choi, Kyung-Ho,Eo, Soo-Mi,Lee, Hong-Keun 한국환경보건학회 2004 한국환경보건학회지 Vol.30 No.3
Acute aquatic toxicity of effluents discharged from five dyeing plants in Gyeong-gi province were evaluated to assess whether the current Korean water quality standards(KWQS) could protect aquatic life. Chemical analyses of all parameters regulated under KWQS, except for E-coli, were also carried out to determine regulation compliance of the samples. All the effluent samples were satisfied with KWQS except for the color in only one sample. In acute Daphnia magna toxicity tests, significant mortality was observed in one of five samples and EC50 was 12.1%(95% confidence interval 9.1-16.2), which was in compliance with KWQS. The result of the Microtox assay indicated that acute microbial toxicity existed in effluents from three out of five plants, two of which were in compliance with KWQS. The agreement between regulation compliance of chemical concentrations of effluent and observed toxicity from various biological toxicity tests was very poor to fair (kappa = 0.194~0.250). The data presented suggest that exposure to dyeing wastewater which were in compliance with Korean water quality standards may not be safe to aquatic biota, and multiple tropical levels should be considered in aquatic toxicity monitoring of dyeing industry.