前言： 从包装的减量化、废弃物回收利用，以及开发新的可降解塑料等方面出发，探讨了塑料包装绿色化的主要途径和措施。
Starting from the respects of decreasing package, retrieve and use of wastes and developing new degradable plastics, main ways and measures for practising plastic package "Green" are expounded.
污泥处理与处置的目的与其他废弃物的处理与处置一样，都是以减量化、资源化、无害化为原则。
The purpose of mud disposal is the same of the disposal of other waste that is decreasing pollution.
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