城市污泥农用处置研究进展

Progress in Research on Agricultural Application of Sewage Sludge

城市污泥的处置方式主要有农业利用、陆地填埋、焚烧和排海。城市污泥中含有大量的植物营养元素,其土地利用能改善土壤的理化性质,提高作物产量,减少污泥对环境的二次污染,从而实现污泥的资源化、无害化、稳定化和减量化处置目标。虽然城市污泥中含有重金属等有害物质,但大量研究表明,经过无害化处理的城市污泥适量施用不会对土壤环境和作物品质造成影响。城市污泥的农林利用已成为最具潜力的污泥处置方式。

Land Application, burying in deserted soil, incineration and dumping inside the sea are the main four sewage sludge disposal methods. Sewage sludge contains abundant plant nutrition, which could improve the physical and chemical character of the soil while applying sewage sludge into the crop land and increase the yields. Land application of sewage sludge not only avoiding the second pollution to the environment, also realizing the resourced, harmless, stabilization, and decreased disposal purpose. Land application has been a expected method in many countries. Plenty studies indicate that it is not a concern when appropriated dose sewage sludge used though it contains much harmful things such as heavy metal.