改良栄養塩内包マイクロカプセルによる原油の微生物処理効果

概要

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The rate of microbial degradation of crude oil on the sea surface is limited by nutrient concentrations around the oil. To enhance the biodegradation by adding nutrients, we improved nutrient microcapsules containing NH_4Cl and K_2HPO_4,and assessed the performance of stimulation of biodegradation of crude oil. The improved ways of preparation of microcapsules by hot methanol could decrease the rate of nutrient release from the microcapsules and enhance the maximum amount of nutrient release. Moreover, even if the improved ones were added at a concentration 25% less than the previous ones (about 9% of the initial weight of crude oil) only once to sea water, the percentage of biodegradation was almost the same as before. To confirm the enhancement of biodegradation by the addition of improved microcapsules in the sea, we used in situ microorganisms in the Keihin Canal in Tokyo Bay. Only 23% of oil was degraded in the sea water, but 56% was degraded in sea water with improved microcapsules added. This corresponded to 85% of the biodegradation in nutrient-enriched sea water.
公益社団法人日本生物工学会の論文
1990-05-25