What Google AI says
Biochar effectively reduces polycyclic aromatic hydrocarbons (PAHs) in contaminated soil by immobilizing them through adsorption (due to its porous structure and surface area) and promoting microbial degradation by creating a better habitat for PAH-degrading microbes, leading to reduced plant uptake and overall lower contaminant levels. The best biochar type depends on the PAH: woody biochar from high-temp pyrolysis helps with stubborn high-ring PAHs, while biowaste biochar from lower temps suits less complex ones. How Biochar Works
- Adsorption: Biochar's large surface area and porous structure physically trap PAHs, making them less available in soil water.
- Biodegradation: It creates a favorable environment (better habitat, increased microbial diversity) for microbes that break down PAHs, especially promoting degraders.
Key Factors for Effectiveness
- Pyrolysis Temperature: High-temperature biochar (e.g., from wood) is better for highly-ringed (HMW) PAHs; low-temperature biochar (e.g., from biowaste) works well for less complex (LMW) PAHs.
