城市生活垃圾中含有多种微量金属元素，并且在填埋处理过程中会产生重金属的二次污染，是城市垃圾填埋处理中最难解决的问题。
There are various trace metals in Municipal Solid Wastes(MSW). Secondary pollution of heavy metals in the process of MSW landfill is the most difficult problem to be solved.
另外，据北京城市环境管理委员会统计，94%的垃圾都填埋处理。
Moreover, according to statistics released by the Beijing municipal commission of city administration and environment, 94 percent of the garbage was disposed in landfills.
研究人员接着仔细观察了200多种可能出现的垃圾处理情形，并将垃圾废料回收的效应与其燃烧或填埋的效应做了对比分析。
The researchers then looked at more than 200 scenarios, comparing the impact of recycling with that of burying or burning particular types of waste material.
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