STEP sludge is therefore our sludge from the treatment of the wastewater treatment plant and which is therefore located in the lagoons. Normally, we spread this sludge on the fields in August.
DAF sludge is the suspended solids found in the PVI process water. No degradation has taken place on this flow, it is just a separation by physical treatment.
This sludge is therefore biodegradable and non-hazardous.