Sludge and biogas



Treating wastewater is our main task. But we also exploit the nutrients and energy contained in the wastewater, and produce sludge and biogas that are recycled to the community.

Sludge used as fertilizer

Our sludge is certified annually in accordance with the Swedish Water & Wastewater Association’s (our industry organisation) certification system REVAQ, and can be used on arable land as an alternative to chemical fertilizers. The sludge is rich in nutrients, among them phosphorus and nitrogen. It undergoes continuous quality control. In recent years, we have been able to improve the quality of the sludge to such an extent that most of the nutrients can now be returned to the ecological cycle and used on arable land in the Stockholm region. The rest is used for production of soil and soil amendment products.

Biogas becomes fuel for buses

We produce the biogas in the Käppala plant’s digesters. We upgrade the biogas to vehicle fuel quality in our upgrading facility. The gas is used as an environmentally friendly fuel for public transport buses. In this way, we help reduce the emissions of fossil carbon dioxide in the Stockholm region.

Environmentally certified

The Käppala Association is environmentally certified in accordance with ISO 14001. Our own laboratory is accredited by SWEDAC in accordance with ISO 17025.

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