Co-digestion to support low temperature anaerobic pretreatment of municipal sewage in a UASB-digester

- Co-digestion enhances direct anaerobic treatment of low temperature sewage.
- Soluble sewage COD removal efficiency of the system improved due to co-digestion.
- Co-digestion tripled specific methanogenic activity of UASB and of digester sludge.
- Additional advantage of co-digestion is improved suspended COD capture in the UASB.