Lime sludge consists primarily of the fine fraction, or the carry-over, from the water softening process. It contains mainly calcium carbonate and its dry-matter content is around 20%. Depending of the production process, the sludge can also contain a significant amount of ferric (hydr)oxide, in which case it is usually referred to as iron-lime sludge.
The sludge can be pumped and its colouration ranges from white to red-brown. The material is produced throughout the Netherlands. Its applications include lime fertilisation in agriculture.
The lime sludge has REACH registration and is included in annex Aa of the Fertiliser Law.
Details are available on request. For more information click here.