미생물 활력도 측정을 통한 서간 폐광지 토양의 생물학적 복원 평가
Evaluation of Bioremediation on Abandoned Coal Mine Soil with Use of Microbial Activity Analysis
미생물 활력도 폐광지;
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Analysis of coal mine waste soil showed that characteristics of the coal mine soil were inhospitable to vegetative growth and microbial activity - high levels of heavy metals, low levels of nutrients and very low pH. Amendment of organic material (decomposed sludge) to the coal soil was attempted to evaluate bioremediation behavior of the organics. The decomposed sludge was applied separately or mixed with coal mine waste soil. Tree growth, microbial activity and heavy metal uptake were measured in the soils. Regardless of the way of the sludge amendment, it was clearly found to increase microbial biomass by adding the decomposed sludge. In comparison with control (no sludge amended coal soil), microbial activity was apparently induced in the coal soil located under the soil amended with decomposed sludge. Tree growth was prominent at the coal soil amended with 25% (v/v) of the decomposed sludge. Nutrient (K, Ca, Mg, Na) contents were very low in the effluent of the amended soil, and this effect was more apparent in the early stage of tree growth. Toxic heavy metals such as Cr, As, and Mn, was hardly detected in all the effluents, irregardless of plantation, amounts of decompose sludge and the way of sludge application. the quantity of a matured sludge and the ways of handling. Plantation likely reduced the concentrations of Fe and Cu in the effluents. Consequently, amendment of the decomposed sludge clearly increased microbial activity in the biological inactive coal soil. Therefore, bioremediation of coal mine waste soil can restore the ecosystem of the coal soil by means of supplying nutrients for plant growth and inducing microbial activity.