我国污泥农用资源化的处置方法

目前，污泥的处置方法主要有填埋、焚烧和农用，前二者由于场地有限、费用昂贵等原因在应用上受到限制。污泥中富含N、P、K及有机质，是天然的有机肥料。因此，把污泥的处置与农用资源化相结合将成为最好的选择。我国污泥农用资源化的方法主要有：自然风干后直接施肥、干燥和造粒后施肥、污泥堆肥后施肥和污泥制复合微生物肥，前二种方法由于不能有效去除污泥中的有害物质，而在应用上受到限制，后二种方法通过众多学者田间试验，表明是一种很有前景的污泥资源化处置方法，但重金属离子易在土壤和植物体内积累是限制污泥大规模土地利用的最重要因素。本文结合实例阐述了我国污泥农用资源化处置现状及未来发展趋势。

An Overview of Sludge Resources Disposal Methods in China

Presently the disposal methods about Sludge are landfill, burning and agricultural ulitization. The former two methods, because of space and expensive cost are limited in using. sludge is rich in N, P, K and organic matter, it is the natural organic fertilizer. So sludge deposal combined with agricultural recycle treatment becomes the best choice. sludge agricultural disposal methods in China are:applying fertilizer directly, applying fertilizer after dried, sludge compost and sludge compounded bio-fertilizer. Because the first two kinds of methods can not get rid of the harmful substance in the sludge effectively, the last two kinds of methods are tested by scholars in fields. It indicates that it is a kind of very promising sludge recycle disposal method, but heavy metal ions are apt to accumulate in soil and plant. It is an important factor that affects sludge land utilization too. This paper has explained the current situation and future development trend in agricultural recycle treatment of sludge disposal in China.