Evaluation of resource value and development of recovery process of buried metal in waste landfills

在垃圾填埋场中鉴定了几种贱金属和稀有金属的丰度和浸出性。多种化学成分的估算表明，必须在垃圾填埋场稳定阶段对废物中的金属进行浸出和回收。考察了废样生物浸出的可行性。硫氧化菌和铁氧化菌作为接种体混合培养的效果已得到证实。利用铁氧化菌电培养对垃圾填埋场开挖垃圾进行生物浸出，对垃圾中所含金属进行了有效的动员。垃圾填埋场应具有较高的金属资源价值，表明金属生物回收的可行性高。

Abundance and leachability of several base metals and rare metals were identified in waste landfills. Estimation of multi-chemical composition indicated that the leaching and recovery of metals from waste must be applied during the stabilized phase of waste landfills. Feasibility of bioleaching for waste sample was examined. Efficiency of mixed culture of sulfur-oxidizing bacteria and iron-oxidizing bacteria as inoculums has been shown. Bioleaching of excavated waste from the landfill by electric incubation of iron-oxidizing bacterium indicated the efficiency of mobilization of metals contained in the waste. Waste landfills should possess high value of metal resources, indicating the high feasibility of biological metal recovery.