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In the European context, storage and recycling of sludge from sewage treatment plants is a highly discussed and sometime a controversial subject. On the other hand, sludge production at the European level it can not to be neglected, being around 13.25 Mt/year. Even if for sewage sludge management there are many alternatives (including incineration or landfilling), its use in agriculture remains a preferred option in many countries due to the results obtained by farmers in terms of productivity levels achieved for ...