The Passavant AD Process
The stages of the process are understood to be as follows:- (Please contact Passavant to confirm these details which are not verified.)
 The first action after the weighing and delivery of waste is a recycling and separation stage which results in a residual organic fraction that cannot be recycled; - The separation stage is based upon grinding, which facilitates the automatic separation of non-ferrous metals;
- This is followed by automatic separation of the organic rich fraction;
- Transport of non-recyclable residue to landfill;
- Second grinding of the organic rich fraction, with further separation, including separation of heavy reject (inert materials e.g. sand, stones, glass, ceramic, batteries, heavy plastic, etc);
- Feedstock is then sent to modular digestion units, where pasteurisation is carried out to comply with Animal By-Products biosecurity regulations, followed by either mesophilic or thermophilic anaerobic digestion;
- Dewatering of sludge,
- Aerobic maturation of digested sludge;
- Biogas preparation, condensate separation, filtering, de-sulphurisation;
- Biogas utilisation in combined heat and power stations CHP.
The system is designed for MSW.
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