Crop Production Department, High Polytechnic School, University of Santiago de Compostela, 27002 Lugo, Spain.
Waste Manag. 2010 Mar;30(3):492-503. doi: 10.1016/j.wasman.2009.09.021. Epub 2009 Oct 29.
Spain is one of the main municipal sewage sludge producers of Europe. This paper aims to agronomically characterise different types of sewage sludge stabilised by different methods (anaerobically digested, composted, and pelletised) and deliver policy recommendations from the results of this characterisation. Anaerobic sewage sludge quality is found to be better in plants with a lower volume of water processing. Composted sludge shows the best quality from a heavy metal point of view, but its low available nitrogen content increases the input of heavy metals when spread, as compared to digested or pelletised sludge. Pelletised sludge has higher heavy metal content than anaerobically digested sludge. Despite the good quality of the sludges, future regulations, especially with regard to Cd levels, will limit the use of this waste in agriculture.
西班牙是欧洲主要的市政污水污泥生产国之一。本文旨在从农业角度对不同方法（厌氧消化、堆肥和制粒）稳定的污水污泥进行特性描述，并根据这些特性描述提出政策建议。研究发现，在处理水量较少的工厂中，厌氧污水污泥的质量更好。从重金属的角度来看，堆肥污泥的质量最好，但由于其有效氮含量低，与消化或制粒污泥相比，在施用时会增加重金属的输入。制粒污泥的重金属含量高于厌氧消化污泥。尽管污泥质量良好，但未来的法规，特别是关于 Cd 水平的法规，将限制这种废物在农业中的使用。
