| 摘要 |
<p>The invention relates to additives for conditioning and preliminary dewatering and for downstream solidification of sewage sludges and organic sludges, which exhibit the following features: (I) they contain at least two components, of which at least one component is selected from the group A which comprises: (A) fine lime (CaO) and hydrated lime (Ca(OH)2), and one further or two further components selected from the group B, which comprises: (B) clays and kieselguhr; (II) the weight fractions of the components A and B in the total mass of A and B, the sum of which is always 100% by mass, are as follows: total mass fraction A: 50 to 98% by mass, total mass fraction B: 2 to 50% by mass The invention further relates to processes for the preparation and the use of these additives for the production of sludges suitable for landfilling. These additives, in the sludge solidification, in comparison with conventional additives, lead to significantly higher, adjustable firmnesses of the solidified products, which at the same time have lower extractability and thus give a low leaching water load in landfills. The conditioning according to the invention leads to higher dry matter contents of the pre-dewatered products.</p> |
