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Assessment of Waste-Derived Biochars on the Health and Biological Activity of Soil

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Published on: October 10, 2025

Bio-refinery approach for spent coffee grounds valorization.

Teresa M Mata¹, António A Martins¹, Nídia S Caetano²

¹LEPABE, Faculty of Engineering-University of Porto (FEUP), R. Dr. Roberto Frias S/N, 4200-465 Porto, Portugal.

Bioresource Technology

|October 4, 2017

Summary

Waste can be transformed into valuable products like metals and oils through effective management and bio-refinery processes. This approach supports sustainable economies and offers higher commercial value than traditional waste treatments.

Keywords:

Bio-refinery Circular economy High value products Life cycle assessment Spent coffee grounds Waste valorization

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Area of Science:

Biotechnology
Waste Management
Sustainable Chemistry

Background:

Waste is often viewed as a problem, but current strategies recognize its potential as a valuable resource.
Effective waste management aligns with sustainable and circular economy principles.
Traditional waste treatment methods often yield lower commercial value compared to resource recovery.

Purpose of the Study:

To demonstrate the application of the bio-refinery framework for deriving high-value products from organic waste.
To present a sequential process for maximizing product recovery and sustainability.
To highlight challenges in the development and implementation of waste-based bio-refineries.

Main Methods:

Utilizing a bio-refinery framework for waste valorization.
Implementing a sequential extraction process to prioritize high-value compounds.
Case study focusing on spent coffee grounds as a feedstock.

Main Results:

Successful recovery of valuable products such as oils, fats, lignin, cellulose, hemicelluloses, tannins, antioxidants, caffeine, polyphenols, pigments, and flavonoids.
Demonstrated economic viability and increased sustainability through sequential product recovery.
Identified key components for valorization from spent coffee grounds.

Conclusions:

The bio-refinery approach offers a viable pathway for transforming organic waste into valuable commercial products.
Sequential processing enhances the economic and environmental benefits of waste valorization.
Overcoming implementation challenges is crucial for the widespread adoption of waste-based bio-refineries.