SCT Composting

The SCT composting unit process:

• Pasteurises the material, killing pathogens and weed seeds
• Reduces the mass and volume of the material
• Provides an area for rehydration of the organics, achieved by recycling water from other processes within the Facility
• Transforms putrescible organic matter into high quality organic growth media.

After being washed and cleaned in the ISKA Percolation process, the solid organic material is directed to the compost bay within the SCT composting building.

Intensive composting occurs inside the fully enclosed composting building, in a negatively aerated bay. Aeration rates and moisture content are controlled to maintain aerobic conditions and high decomposition rates. The material is maintained in the thermophilic temperature range of 45ºC to 75ºC.

A patented auger bridge crane (named BioMax-G) runs above the composting bay. It consists of a portal bridge crane that travels on rails fixed on the ground outside of the bay containment walls for the full length of the composting bay. An auger carrying trolley runs transversely on the bridge crane.

The auger carrying trolley is fitted with two inclined counter rotating augers with their tips turned towards the bay loading side. The combined rotation action of the augers, the tripper trolley and the auger bridge crane translation, turns the composting material and transports it from the loading to the unloading side of the composting bay.