Nutritional Factors Affecting Efficiency of a Bioremediation Process for Diesel-Contaminated Soil

경유오염 토양의 생물정화공정에 대한 영양인자의 영향 분석

  • Published : 1999.08.01

Abstract

In order to analyze nutritional factors affecting in situ bioremediation of diesel degradation and cell viability were studied by varying nutritional conditions. In column experiments packed with diesel-contaminated soil, nitrogen was found to be the major limiting nutrient. When nitrogen was added to soil at four different levels of C : N (100 : 5, 100 : 10, 100 : 15, and 100 : 20 mg N/kg dry soil), the greatest simulation of microbial activity occurred at the lowest, rather than the highest nitrogen addition. However, no significant effects was observed when phosphorus and air were added. No matter how the incubation mode varied, less than 50% of the diesel was remained after 7 days of treatment, presumably because the residual hydrocarbons were adsorbed on soil particles, adsorption

한국해양연구소에서 분양받은 유류분해효모 Yarrowia lipolytica CL180를 이용하여 경유로 오염된 토양에 대한 질소원, 인원 aeration rate, 그리고 균체량에 따른 영향을 조사하였다. 실험결과 질소원이 미생물 성장의 limiting factor로 작용하였으며, 다양한 비(C : N =100 : 5, 100 : 10, 100 : 15, 100 : 20 mg/kg soil)의 질소원을 첨가한 결과 C : N의 비(w/w)가 100 : 5일 때 가장 우수한 분해율과 균체수를 나타내었다. 질소원이 이 비율 이상으로 첨가되었을 때 분해율과 균체수가 낮게 나타났으며 이는 암모니아의 독성으로 인한 영향으로 사료된다. 그러나 인원과 통기에 따른 경유분해율의 변화는 없었으며 질소원이 첨가된 soil column에서는 7일이 경과된 후 약 50%의 경유잔류량을 나타내었다. 잔류경유를 제거하기 위하여 최초 접종량과 동일한 양의 균주를 접종하였으나 일정기간의 경과후에도 경유잔류량은 거의 변화가 없었다. 이는 경유의 토양 흡착 때문으로 사료된다.

Keywords

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