Biochar from paddy field - A solution to reduce PFAS pollution in the environment

Area of Science:

• Environmental Chemistry
• Materials Science
• Agricultural Science

Background:

• Per- and polyfluoroalkyl substances (PFAS) are persistent environmental contaminants.
• Conventional activated carbons show limited efficacy for short-chain PFAS removal.
• Andosol soil and rice husk biochar show potential for PFAS remediation.

Purpose of the Study:

• To evaluate the adsorption capacity of various activated carbons for PFAS in water.
• To identify effective materials for removing diverse PFAS chain lengths.
• To propose a sustainable rice cultivation system for integrated PFAS removal.

Main Methods:

• Testing thirteen commercial activated carbons for PFAS adsorption.
• Characterizing adsorption capacity across ultrashort-chain to long-chain PFAS.
• Evaluating Triporous™-PFAS derived from rice husk.
• Assessing the potential of a rice cultivation system using Andosol and biochar.

Main Results:

• Triporous™-PFAS demonstrated over 95% adsorption for PFAS from ultrashort-chain (C1-C2) to long-chain (C10-C13).
• Activated carbon derived from rice husk showed superior performance compared to others tested.
• The proposed rice cultivation system integrates biochar production for continuous PFAS removal.

Conclusions:

• Rice husk-derived activated carbon, Triporous™-PFAS, is highly effective for broad-spectrum PFAS removal.
• A novel Japanese rice cultivation system utilizing Andosol and biochar offers a sustainable approach to environmental PFAS remediation.
• Triporous™-PFAS-F may aid in lowering detection limits for total PFAS measurement methods.