CAJ | 학술논문

微生物对铝硅酸盐矿物的风化分解包含直接作用与间接作用两种方式.采用微孔滤膜将细菌与矿物隔离,在细菌?矿物直接接触与间接接触两种模式下,研究环状芽孢杆菌对铝土矿风化分解行为的影响.结果表明:在细菌生长的0~216 h 内,细菌及代谢产物能通过直接和间接作用共同促进铝土矿的分解,但直接作用的强度明显大于间接作用的;Al 的溶出主要受直接作用的影响,而铝土矿中 K、Fe 和 Si 的溶出率主要受间接作用的影响;细菌代谢产物对溶出的 Al 具有明显的絮凝抑制作用,对 Si 具有良好的分散性能;细菌对铝土矿中不同晶体结构的硅酸盐矿物具有“选择性”的分解作用,具层状结构的高岭石、伊利石、绿泥石较架状结构的石英更易被细菌风化分解;在直接作用模式下,细菌在生长过程中会产生大量的胞外多聚物,细菌和矿粉之间会形成菌体?矿物聚集体,促进铝土矿的分解.分析认为,细菌对铝土矿的分解过程包括机械破坏、代谢产物溶蚀、络合作用及这3种作用的协同效应.
미생물대려규산염광물적풍화분해포함직접작용여간접작용량충방식.채용미공려막장세균여광물격리,재세균?광물직접접촉여간접접촉량충모식하,연구배상아포간균대려토광풍화분해행위적영향.결과표명:재세균생장적0~216 h 내,세균급대사산물능통과직접화간접작용공동촉진려토광적분해,단직접작용적강도명현대우간접작용적;Al 적용출주요수직접작용적영향,이려토광중 K、Fe 화 Si 적용출솔주요수간접작용적영향;세균대사산물대용출적 Al 구유명현적서응억제작용,대 Si 구유량호적분산성능;세균대려토광중불동정체결구적규산염광물구유“선택성”적분해작용,구층상결구적고령석、이리석、록니석교가상결구적석영경역피세균풍화분해;재직접작용모식하,세균재생장과정중회산생대량적포외다취물,세균화광분지간회형성균체?광물취집체,촉진려토광적분해.분석인위,세균대려토광적분해과정포괄궤계파배、대사산물용식、락합작용급저3충작용적협동효응.
@@@@The microbial decomposition mechanisms of bauxite include direct and indirect mechanism, while the contribution of each mechanism to the mineral weathering is still in controversy. The impact of Bacillus circulans on decomposition of bauxite was studied under the conditions of microbe-mineral direct contact and indirect contact. The microfiltration membrane was used to segregate mineral powder from bacteria. The results show that Bacillus circulans and its metabolites can clearly promote the degradation of bauxite through either mechanisms during incubation in 0?216 h, and the effect of direct mechanism on the mineral degradation is more efficient than that of indirect one. The Al dissolution from bauxite is mainly determined by the direct mechanism, and K, Fe, Si are considered to be released by indirect mechanism. The bacterial metabolites can flocculate and inhibit Al in supernatants, but have good dispersibility on Si. The Bacillus circulans can selectively degrade different minerals due to the difference in mineral crystal structure. Kaolinite, illite and chlorite with layer structure are more easily decomposed than quartz with framework structure by bacteria. The Bacillus circulans can produce extracellular polymeric substances during incubation, and form the mycelium-mineral aggregate between bacteria and mineral powder. It is concluded that the Bacillus circulans can decompose bauxite at the mechanical breakage of the mycelium growth, the corrosion and complexation of metabolites and their synergetic operation.