What is the solids retention time for a mesophilic digestion system?

The solids retention time for a mesophilic digestion system typically ranges from 10 to 30 days. This is a critical period during which microorganisms break down organic matter in the anaerobic environment, allowing for the reduction of volatile solids and the stabilization of sludge. Within this time frame, the conditions in the digester facilitate the optimal activity of mesophilic bacteria, which thrive at moderate temperatures, typically around 30 to 38 degrees Celsius (86 to 100 degrees Fahrenheit).

The selected range is ideal for ensuring that enough time is allowed for effective digestion, which not only reduces the volume of waste but also helps in pathogen reduction and produces biogas as a byproduct. This process is essential for treatment facilities to manage their sludge effectively, improving overall operational efficiency and sustainability.