前言： 垃圾卫生填埋法的关键技术之一是防渗垫层的铺设，国内外对防渗垫层的要求是“防渗”，所设计的防渗垫层所用材料种类多、价格贵、铺设复杂、成本高。
One of the key techniques for garbage sanitary burial is the pavement of a liner, which is designed to prevent seepage. It is very expensive.
膜分离法成本较贵，但工业化前景很好，目前主要集中于实验室制膜技术的研究。
Membrane separation had the disadvantage of expensive cost but it had appreciable application foreground and it mainly presented in the field of membrane preparation research at present.
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