Resource Efficient Use of Waterwork Sludge

Important results from the project

Several million tons of waterworks sludge is generated annually worldwide. The amount is expected to increase due to urbanization, increasing water demand and quality changes in raw water which require greater chemical dosing. Cooperation has been established between water utilities and industry, which resulted in identification of three methods for recycling of waterworks sludge. All methods have a high potential to reduce landfilling and make communities more sustainable. In a continuation of the project, the methods should be developed and verified, also financially.

Expected long term effects

The project has concretely resulted in the establishment of a network of public and private companies active in the water sector. Three suitable methods to recycle and utilize waterworks sludge have been identified. The national and global market for water treatment sludge has also been assessed. An application to the UDI step 2 has been developed and if this is granted, the methods can be tested in practice. The outcome of the project is expected to be recycled products from the sludge with good functionality and price, as well as an end of landfilling of waterworks sludge.

Approach and implementation

Through meetings with project partners and literature study, the participants have gained a good understanding of the challenge with increasing production of waterworks sludge and shared knowledge between the partners. The participants have also identified solutions for recycling with great potential which are interesting to further develop. New partners with interesting solutions have joined the project. They are ready to engage in the project to develop their methods and establish good relationships with the utilities.