Overview
This document provides a technical analysis of biochar production from municipal sewage sludge using the Biogreen® process. It highlights the benefits, specifications, and potential applications of biochar as a soil amendment and fertilizer.

Specifications

• Resistivity: 10823 ohm.cm
• Conductivity: 0.09 mS/cm
• pH at 20°C: 6.8
• Air porosity: 65% V/V
• Water porosity: 14% V/V
• PF1 porosity: 79% V/V
• Dry bulk density: 383 kg/m3
• Total Nitrogen: 4.9 g/100g
• Phosphorus: 8.1 g/100g
• Potassium: 0.46 g/100g
• Sulphur: 2.5 g/100g

Procedures
The Biogreen® process involves thermochemical conversion of sewage sludge, resulting in a dry, sterilized product with no odor and reduced fire risk. The process also allows for heat recovery from gas.

Norms and Standards
The biochar produced conforms to NfU42001 standards, ensuring its suitability for use as a soil amendment.

Recommendations

• Biochar can be used to improve soil fertility and water retention.
• The process is suitable for digestate from aerobic digesters.

Data and Analysis
The document includes data on the production and disposal of sewage sludge in the EU, with specific examples from France. It outlines the distribution of sewage sludge treatment methods, including agriculture, thermal processing, landfill, and composting.

Conclusion
The Biogreen® process offers a sustainable alternative for sewage sludge treatment, converting waste into valuable biochar while optimizing energy consumption and reducing environmental risks.