The role of anaerobic sludge recycle in improving anaerobic digester performance

- A pilot WWTP is operated with and without anaerobic digester sludge recycle.
- Anaerobic digester sludge recycling in traditional WWTPs increases CH4 production.
- Anaerobic digester sludge recycling decreases net solids yield.
- More consistent Archaea concentrations occurred system wide with sludge recycling.