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최형일,정경훈,김인수,송영일 조선대학교 환경연구소 1994 環境公害硏究 Vol.11 No.-
The contents of heavy metals and total organics in bottom mud of the Mokpo marine have been investigated. This area was divided into three regions; Daebul, Mokpo, and Sanjung, and sampling sites region were selected by eight sites. Marine bottom mud mere investigated three times during this study and twenty-four samples are taken from eight sampling sites. Analytical species were Cdmium, Copper, Lead, zinc, Arsenic and total organics. The Heavy metals were analyzed by atomic absorption spectrophotometry, also total organics were analyzed by gravimetry. The major resurts of the studies were as follows: 1. The contents of the heavy metals and total organics in marine bottom mud were Cadium 0.272 mg/kg, Copper 3.384 mg/kg, Lead 9.647 mg/kg, zinc 10.031 mg/kg, Arsenic 0.636 mg/kg, Total organics 5.99 wt%. 2. The Zinc was higher than any other heavy metals in the marine bottom mud. The mean contents of heavy metals in Sanjung region was the lowest. 3. Lead and Arsenic species were influenced by the pollutants influxed from Youngsan River, and Cadium and Copper were less than it's contents of the natural soils. 4. The total organics in the marine bottom mud was exceedingly increased as the contrasted with the small particle size of the marine bottom mud, and the corelation coefficients between heavy metals and total organics were high. (0.5<r<0.8)
崔炯一,鄭京勳 조선대학교 환경연구소 1993 環境公害硏究 Vol.10 No.-
In order to research the water quality of artificial BOSUNG river which is now constructing for multi-purpose dam and water source Chuam DAM and its branch we did in May 1991, Dec. 1991 and the result were as follows: 1. In everywhere pH was 6.6-7.6 and very similar to our general rivers and there is no evidence to change the pH 2. In the investigation DO was 7.4-9.7(May-Oct.) and it was lower than 8.7-12.2 ppm(Nov.-Dec.) 3. BOD was 0.30-2.70 so it was estimated good quality 4. The values of average T-N and T-P showed up 0.131㎎/l, 0.028㎎/l during May, 0.141㎎/l, 0.033㎎/l during June But the analyzed results showed Poor-middle stage below the Eutrophication standard value of RV.Vollenweider. 5. In order to control the water quality of Chuam Dam thoroughly, it needs to minimize the upper inflow pollutants through sewage treatment, farming wastewater treatment, composting, usage decrease of chemical fertilizers and agricultural medicines, and so on For this, it is necessary to assign the waterworks protection area and to establish the special counterplan and the whole responsibility concerning body for control constantly as soon as possible.
崔炯一,申大允,鄭京勳 조선대학교 환경연구소 1991 環境公害硏究 Vol.8 No.-
The activated sludge treatment for the synthetic waste water was investigated under low temperature of 5℃ and the results were as follows ; 1. In the case, of the synthetic waste water of peptone was used the COD removal was unstable. 2. In the synthetic waste water of starch, we could found that pH was stable and the COD removal was about 83%. 3. Inspite of change of MLSS on the activated sludge the constant COD removal was obtained. 4. When the synthetic waste water was treated for long term in the activated sludge the SVI was increased gradually. 5. Non filamentous flocculation on the activated sludge was transformed into filamentous bulking floc. 6. Bioflocculation formed on the activated sludge was small compared with that of conventional activated sludge.
적조생물 Amphidinium Carterae 의 사멸에 미치는 자외선의 영향
김살혁,최칠남,차월석,정경훈,정오진 한국환경과학회 2000 한국환경과학회지 Vol.9 No.6
The effect of UV on the mortality rate of toxic dinoflagellate Amphidinium carterae causing a red tide in the coastal area of south Korea was investigated in the batch and continuous-scale reactor equipped with ultraviolet irradiation-apparatus. Degussa P_25 titanium oxide, a photocatalyst proved to be effective for the mortality of Amphidinium carterae supplied with photocatalyst and UV radiation were greater than 95% in 2 minutes of UV radiation and the rate were higher than that by UV-radiation without titanium dioxide in the batch and continuous-flow scale reactor. The mortality time of Amphidinium carterae increased with the cell density under UV-illumination in the batch scale reactor. The mortality rate in the density of 5.0×10 exp (4) cells/mL at the same experimental condition was more than 90% in 4 minutes in the continuous flow scale reactor. The percentage of 99.9±0.1% of Amphidinium carterae in the density of 5.0×10 exp (4) cells/mL was died in 20 minutes when the phytoplankton was illuminated with UV-radiation without photocatalyst.