• The Journal of Engineering Geology
• /
• v.20 no.4
• /
• pp.381-390
• /
• 2010

This study assessed the hydrogeological characteristics of a seepage area of white leachate. The geological characteristics of the leachate were determined by a surface survey, and an electrical resistivity survey and borehole image processing system (BIPS) were applied to estimate the distribution of discontinuities, to assess the geological structure of the seepage areas. Fluctuations in groundwater level within boreholes were measured during periods of precipitation in the dry and wet seasons. The results show that electrical resistivity is lower in the seepage section than in non-seepage sections. The distribution of fracture zones and limestone cavities was inferred from the logging data and BIPS data. Variations in groundwater level and groundwater recharge, related to rainfall events, show the direct effect of rainfall events during the rainy season. We obtained a strong relationship between seepage amount and rainfall (correlation coefficients of 0.83-0.97).

• Korean Journal of Microbiology
• /
• v.33 no.1
• /
• pp.43-48
• /
• 1997

여러가지 난분해성 물질에 대한 생분해능을 지닌 백색부후균에 의한 매립지 침출수의 탈색을 조사하였다. 국내에서 분리한 Coriolus versicolor KR-11W와 Irpex lacteus KR-39W가 이제까지 주로 연구되어 온 Phanerochaete chrysosporium보다 높은 탈색능을 나타내었는데 I. lacteus KR-39W는 산소공급시 10%의 침출수가 함유된 YMG 배지의 진탕배양에서 85%의 색도제거율을 나타내었으며 최소배지에서도 80%의 탈색율을 보였다. P. chrysosporium에 의한 리그닌 분해능 및 분해효소 생성 보고들과 달리 진탕배양이 정치배양보다 탈색능이 높았으며 산소공급은 색도제거에 증가효과가 있었다. 균체 접종량(10-30%)과 온도(25,37.deg. C)는 탈색에 큰 차이를 보이지 않았으나 탄소원과 질소원의 농도는 상당한 영향을 나타내었다. 리그닌 분해효소군의 여러 가지 inducer와 cofactor를 C. versicolor KR-11W 배양에 첨가한 결과 많은 경우 균접종 대조군보다 2배 이상의 탈색율과 lignin peroxidase 활성의 증가를 보였으며 FeS $O_{5}$ 첨가시에는 최대 2.9배의 증가를 나타내었다. 탈색에 관여하는 효소군은 접종물에 이미 어느 정도 존재할 수 있으며 배지 및 배양조건에 따라 그 생성이 변화할 수 있으므로 이런 조건들을 잘 맞출 경우 보다 높은 탈색능이 기대된다.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.38 no.3
• /
• pp.372-376
• /
• 2009

Physicochemical changes in persimmon were examined during natural organic acid fermentation. Major organic acids in raw persimmon juices were lactic acid (980 mg%) and acetic acid (245 mg%). The content of acetic acid was continuously increased during the whole period of fermentation up to 3 years. Glucose was the dominant free sugar, but the content was decreased after 20 days of fermentation. Most of the glucose was converted to ethanol until 40 days after initiation of acid fermentation. L- and a values of Hunter's color in fermented persimmon juice, which was naturally exuded from persimmon fruit as fermentation continued, increased gradually, while b value decreased. Acetic acid (1584 mg%) was the most abundant organic acid followed by lactic acid (712 mg%) and citric acid (48 mg%) in a persimmon fruit juice after completion of 3 year fermentation. A minute amount of residual free sugars, mainly glucose, even after 3 years of fermentation may cause changes in quality characteristics while storage for edible use.

• KSBB Journal
• /
• v.16 no.6
• /
• pp.632-637
• /
• 2001

The cells obtained from diesel contaminated site were tested for diesel degradation by culturing them on the culture medium that contained diesel as the only carbon source. Two strains that grew well in the culture media were separated: one formed white colony and another strain formed yellow colony. When they were cultured together, much higher diesel degradation was obtained compares to that of individual cell culture. Mixed culture of white and yellow colony forming strains grew well with 1%(v/v) diesel and the addition of growth nutrients increased the diesel degradation. Additional nitrogen source was efficient for higher diesel degradation (over 90%) when it was compared with that without nitrogen source. When mixed culture of white and yellow colony forming cells were applied to the soil column system contaminated by diesel, 30 mL/min of air flow rate was found to be sufficient to degrade diesel oil. The diesel degradation did not increase noticeably at higher flow rate. The addition of nitrogen source resulted in the increase in diesel degradability.