Preparation of Activated Carbon from C-rich Waste of Rice Husk Ash-based Sodium Silicate Process

This integrated technology converts the carbonaceous waste from the sodium silicate process, starting from rice husk ash/char, into activated carbon. It enables full valorization of agro-waste, reduces environmental impact, and offers revenue streams from both sodium silicate and activated carbon. 

The carbonaceous waste generated during the production of sodium silicate from rice husk ash/char is utilized to produce activated carbon through hydrothermal or thermochemical methods. This activated carbon serves as an effective adsorbent in various applications, especially in oil decolourisation. Since the primary process uses rice husk ash to generate sodium silicate and the by-product is fully valorized, the approach maximizes resource utilization. As a result, the technology supports a zero-waste industrial model with enhanced economic and environmental benefits.

1. The process ensures zero-waste operation.
2. It generates value-added by-products—sodium silicate and activated carbon—from a single agricultural waste source.
3. It promotes environmental sustainability by reducing disposal issues and supporting circular economy principles.
4. The technology offers dual revenue streams, enhancing profitability through the sale of both sodium silicate and activated carbon.
5. The process is scalable and can be seamlessly integrated into existing sodium silicate manufacturing facilities.