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生物學的 方法에 의한 廢棄物의 再活用

Waste Recycling Through Biological Route

이승원|김동진|박경호|안종관|Debabrata Pradhan
한국자원리싸이클링학회|2008.04|자원리싸이클링 (Resources Recycling)|제17권 제2호|pp. 3-15

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키워드

industrial wastemicroorganisms폐촉매황화광물Bioleaching미생물 침출산업폐기물spent catalysts미생물 균주sulfide minerals
주제분류자원공학

초록

다양한 독성 폐기물이 주변 환경에 배출되면 궁극적으로 모든 생명체의 생존에 위협이 된다. 박테리아 및 곰팡이종의 반응을 이용한 미생물침출 및 미생물복원을 포함하는 바이오 습식제련은 환경문제를 극복하는데 적합한 경제성이 있는 잠재기술이다. 미생물 침출은 Thiobacillus ferrooxidans, Thiobacillus thiooxidans, Laptospirillum ferrooxidans와 같이 금속과 반응을 일으키는 박테리아를 이용하여 다양한 광물 및 폐기물로부터 금속 성분을 용해하는 것을 말한다. 일반적으로 미생물 침출반응은 직접 및 간접반응으로 나누어진다. 직접반응에서 박테리아는 성장 및 물질대사를 위하여 침출 기질로부터 전자를 받아 황산을 생산하므로써 황화광물을 산화시킨다. 반면 간접반응에서는 철산화 박테리아에 의해 생성된 Fe3+가 황화광물을 산화시킨다. 이러한 침출기구를 통하여 저품위 광물 및 정광, 슬러지, 광미, 플라이 애쉬, 슬래그, 전자 스크랩, 폐밧데리 및 폐촉매 등으로부터 금속을 회수할 수 있다. 생물학적 방법은 폐기물의 매립을 극복할 수 있는 대체기술로서 건강하고 깨끗한 환경 보존에 기여할 수 있다.

Abstract

Different toxic wastes are disposed of in our surroundings and these will ultimately threaten the existence of living organisms. Biohydrometallurgy, which includes the processes of bioleaching and bioremediation through the activities of microorganisms such as bacterial or fungal species, is a technology that has the potential to overcome many environmental problems at a reasonable economic cost. Bioleaching were carried out for dissolution of metals from different materials using most important metal mobilizing bacteria such as Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Laptospirillum ferrooxidans. According to the reaction, bioleaching is parted as direct and indirect mechanism. In direct mechanism the bacteria oxidize the sulphides minerals by accepting electron and producing sulphuric acid in leaching media for their growth and metabolism. In other hand the indirect bioleaching is demonstrated as the oxidation of sulphides mineral by the oxidant like Fe3+ produced by the iron oxidizing bacteria. Through this process, substantial amount of metal can be recovered from low-grade ores, concentrates, industrial wastes like sludge, tailings, fly ash, slag, electronic scrap, spent batteries and spent catalysts. This may be alternative technology to solve the high deposition of waste, which moves toward a healthy environment and green world.

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