Digestate treatment from biogas and biomethane plants
In the anaerobic digestion process, Biogas and Biomethane plants (agricultural, industrial, OFMSW) produce digestate, which requires further treatment in order to obtain a stabilized and environmentally compatible material.
Normally, through a separation process (with presso-coclea or centrifuge) they produce:
- Solid, palatable digestate that is sent to a composting process;
- Liquid digestate, which can have different physical, chemical and biological characteristics depending on the matrices entering the plant.
Liquid digestate has a high water content and is loaded with ammonia nitrogen (NH4), characteristics, these, which can lead to a number of problems related to:
- Spreading (Nitrates Directive);
- Biological instability in the anaerobic digestion process;
- Increased storage volumes;
- High transportation or disposal costs.
Biowaste proposes the following technologies (or a combination thereof) applicable to solving these problems:
In the most complex cases, to determine the most cost-effective treatment process in terms of “capex” and “opex,” we propose a feasibility study before proceeding with the final plant bid that includes:
- Wastewater sampling and analysis;
- Treatment trials on pilot plants;
- Drafting the final report.