Bottom ash recycling

Bottom ash is a by-product of the waste-to-energy process. With our state-of-the-art recycling service, we recover the valuable minerals and metals, which the bottom ash contains, that would otherwise be lost.

We offer bottom ash recycling services for waste-to-energy plants. Our service concept is cost-effective and versatile and can be tailored to meet the specific needs of our customers. We are also constantly developing and innovating new recycling solutions and productisation of metals and minerals.

Flexible, customer-oriented service

Our recycling service for bottom ash is reliable and fast and can also be tailored to meet the specific needs of our customers. We have seven sorting units that currently operate in Sweden, Finland, Norway, and the Baltics. The processing capacity of these units is 700 000 tons (kg) annually. Our flexible sorting units can be transferred from one processing site to another and be operational even within a day.

State-of-the-art process

Our recycling process maximises metal extraction from bottom ash. The novel technique liberates even the minute quantities of valuable metals that traditional methods have not been able to recover. We are also constantly developing and innovating new solutions for metals as well as mineral utilisation. The recycled mineral fraction is available for customers as Fortum Gravo® products, designed for roads and other civil engineering structures, for example, in filtration and sub-base layers.

Contributing to the circular economy

Recycling bottom ash and utilising the recovered minerals helps to save natural resources and contributes to the circular economy. Recycling metal reduces CO2 emissions by as much as 90% compared to primary metal production. Therefore maximising the recovery of valuable metals is essential.


Fortum Gravo

Aggregate-like products for civil engineering structures – produced from waste-to-energy plants’ bottom ash

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