Monitoring respiration and biological stability during sludge composting with a modified dynamic respirometer

▸ A respirometer was adapted to dynamic conditions and used to measure solid wastes respiration indices. ▸ Airflow recirculation system through the waste reduced O2 transfer limitations and increased respiration rates. ▸ This technique would improve biological stability measurements. ▸ It was applied to measure compost stability during a sludge composting process.