• 한국수산과학회지
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• 제11권4호
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• pp.243-247
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• 1978

충무부근 굴 양식장의 노화정도를 구명코져 1978년 5월부터 11월까지 진해만의 가조도부근과 고성만의 읍도부근 그리고 거제만의 어구양식장에서 저질 및 저층수의 수질을 조사한 결과를 요약하면 다음과 같다. 1. 저이중의 COD와 유화물량은 대체로 여름에 많았는데, COD는 가조도부근에서 38.1mg/g, 읍도부근에서 32.3mg/g, 그리고 어구양식장에서 25.1mg/g 이었고, 유화물량은 가조도부근에서 0.313mg/g, 읍도부근서 0.517mg/g, 그리고 어구양식장에서 0.132 mg/g 이었다. 2. 저이중의 COD와 유화물량으로 보아, 가조도 부근 양식장과 읍도부근 양식장은 다 함께 COD의 부영양 최고치인 30.0mg/g을 초과하였고, 초화물량은 상한치인 0.30mg/g을 상회하여 이미 과영양수역에 속하는 반면, 어구양식장은 비교적 양호한 편이었다. 3. 저층수의 수질은 저질처럼 양식장간의 뚜렷한 차이가 없었다. 단, 9월중 가조도부근에서 유화물이 1,07mg/l로 많은 양이었는뎨 이는 8월중에 있었던 적조의 영향 때문이라고 추측된다.

• 한국환경과학회지
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• 제9권2호
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• pp.137-144
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• 2000

The observations on the seasonal fluctuation and distributional characteristic of organic matters on surface sediments and its origin were carried out at the 25 stations in Keogeum-sudo, southern coast of Korean Peninsula from February to October in 1993. I made an analysis on the environmental factors for surface sediments such as temperature, ignition loss, chemical oxygen demand, pheopigment, total sulphide, water content, mud content in grain size, COD/IL ratio and COD/sulphide ratio. The results are as follows ; 1) The range of temperature on the surface sediments was between 6.2${\circ}C$ and 24.6${\circ}C$. The highest mean temperatuer of mud was 24.0${\circ}C$ in summer, the lowest 6.6${\circ}C$ in winter. 2) Ignition loss(IL) fluctuated between 1.2% in winter and 16.8% in spring, that is to say, the seasons of increasing in temperature were very high ignition loss. 3) Chemical oxygen demand(COD) showed the highest mean value of 20.52 mg/g dry in summer within the range of 15/46~32.78 mg/g dry, while showed the lowest of 5.79 mg/g dry in winter within the range of 7.4~17.39 mg/g dry. 4) Pheopigment concentrations showed the highest mean value of 4.85 $\mu\textrm{g}$/g dry in autumn within the range of 0.84~9.21 $\mu\textrm{g}$/g dry, while it did the lowest mean value of 1.97 $\mu\textrm{g}$/g dry in summer within the range of 0.23~4.83 $\mu\textrm{g}$/g dry. 5) Total sulphide (H2S) fluctuated between no detect(ND) in spring, and 2.43 mg/g dry in sutumn. The highest mean value was 0.68 mg/g dry in sutumn, the lowest was 0.16 mg/g dry in spring. 6) Water content(WC) and mud content in grain size showed the mean value of 43.2% within the range of 26.5~59.7% and 91.0% within the range of 57.8~99.2%, respectively. 7) By the analytical results on the source of organic matter, it had been dumped from the seaweed farms in Keogeum-sudo coastal waters.

• 한국수산과학회지
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• 제10권4호
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• pp.259-265
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• 1977

굴 양식장의 환경연구중 거제만양식장의 밀도 및 노화정도에 관한 기초조사를 1977년 6월부터 11월까지 6개월간에 걸쳐 실시하였다. 1. 거제만해역의 면적은 $48.87km^2$이고 도수산국에 등록된 이 해역내의 양식장 수면적은 $10.91km^2$이다. 해역면적에 대한 면허면적은 $22.23\%$이고 면허면적과 해역면적의 비는 1 : 4.48이다. 2. 부영양화의 정도를 A,B,C로 구분하여 C단계를 과영양화로의 과도기단계라 할때, 거제만은 양식어장으로서 수질은 A단계로 양호한 편인데 비해 저질은 C단계로 부영양화의 한계치에 도달되었거나 또는 약간 상회하며 과영영화로 진입하고 있다.

• Journal of Microbiology and Biotechnology
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• 제15권2호
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• pp.412-420
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• 2005

In order to investigate factors affecting the denitrification in the F-STEP PROCESS using a loess ball as support media and Pseudomonas DWC 17-8, calcining temperature, loess ball size, pH, nitrate concentration, working temperature, and inhibitor were studied in batch mode using synthetic sludge. A 5- 10 mm of loess ball (960$^{circ}$ of calcining temperature) was the most suitable for denitrification. When the initial pH was increased from 3.0 to 7.0, the removal efficiency of nitrate was increased. Specifically, at initial pH of 7.0, the maximum removal efficiency of nitrate was 5.0 mg/min. When the initial concentration of nitrate was increased from 100 to 400 mg/l, the removal efficiency of nitrate was proportional to the concentration of nitrate. The maximum removal efficiency of nitrate was 5.72 mg/min at 400 mg/l of initial concentration. When the operating temperature was increased from 10 to 30$^{circ}$, the removal efficiency of nitrate was increased from 0.76 to 6.15 mg/min, and at above 40$^{circ}$ of operating temperature, it was decreased from 4.0 to 2.0 mg/min. Among the various inhibitors, higher than 10$^{-1}$ M of sodium azide abolished this reaction completely. When the KCN concentration was above 10$^{-1}$ M, the reaction was inhibited completely. In the case of 2,4-dinitrophenol and sodium sulphide, it was inhibited at above 10$^{-2}$ M completely. For testing the various flow orders of the F-STEP PROCESS for effective denitrification using practical wastewater, continuous experiments under the optimum conditions were carried out for 60 days. Among the various processes, the PROCESS A gave the highest efficiencies of denitrification, nitrification, and total nitrogen (TN) removal with 86.5, 89.5, and $90\%$, respectively. For scale-up in the PROCESS A, real farm wastewater was used and pilot tests carried out for 90 days. The denitrification efficiency was $97.5\%$, which was increased by $12.7\%$. The efficiencies of TN removal and nitrification were 96.6 and $70.0\%$, respectively. The removal efficiency of chemical oxygen demand (COD) was $63.7\%$, which was increased by $20\%$.