The application of nitrogen spring on cool punching die is introduced, and the elastic components such as 'heavy-load used polyurethane' components is briefly stated.
前言： 介绍氮气弹簧在冷冲模中的应用，另外还简单介绍了“高负载用聚氨酯”组件等弹性元件。
The character of granule, cultivation of special granule and its application to COD removal, de-nitrogen, toxic chemicals degradation, heavy metal adsorption in wastewater treatment were reviewed.
并详细介绍了颗粒污泥的特点，特种颗粒污泥的培养及其在COD去除、脱氮、降解毒性物质和重金属吸附等方面的应用，并对其应用前景进行了展望。
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