Clean blocks are specially produced drain blocks, consisting of mineral wool cubes that are used to filter sewage and to treat the water by the biological activity within the filters.
This technology focusses specifically on removing turbidity, COD, NH4-N and PO4-P and doesn’t require energy to operate. The filters will be tested as a passive in situ treatment step in the drain when the hydraulic capacity of the drain is sufficient during dry season, and as a pre-treatment of the PAS system on site.
The clean blocks consist of cotton candy made from molten rock with densities 120 – 80 – 45 kg/m3
High porosity > 98%
- High hydraulic conductivity ≤ 1 m/min
- High filtration rate
- Large internal surface area
- Biofilm formation