What is biopile treatment for contaminated soil?

Biopile treatment is an ex situ bioremediation technique where contaminated soil is excavated and formed into heaps (piles) for biological treatment. Key features include: pile construction with proper base and containment to prevent leachate migration, aeration systems (passive pipes or active blowers) to supply oxygen, irrigation systems to maintain optimal moisture (40-60% water-holding capacity), nutrient addition (nitrogen and phosphorus) to support microbial growth, and covers to control temperature and moisture. Treatment enhances natural biodegradation of petroleum hydrocarbons and other organic contaminants. Monitoring includes tracking contaminant concentrations, microbial activity (respiration rates), temperature, and moisture. Treatment times range from weeks to months depending on contamination levels and conditions. Biopiles combine advantages of controlled treatment with lower costs than fully enclosed bioreactor systems.