ReciDigest - Implementation of Digestate Treatment and Recirculation - Influence on Anaerobic Digestion

摘要

The ReciDigest project aims at improving the overall efficiency of anaerobic digesters processing organic waste and side streams by introducing digestate treatment and recirculation to the digesters. Application of ultrasound technology or oxidation-based techniques (ozone and hydrogen peroxide) on the digestate leads to the conversion of the residual refractory organic matter to easily biodegradable (soluble) organic components. When subsequently recirculating this treated digestate back to the digester, it becomes a new, secondary substrate, hence achieving a higher degree of conversion for the organic matter present in the original feed. Furthermore, ammonia inhibition caused by feeding nitrogen-rich substrates such as manure, is tackled by introducing a second treatment, i.e., the addition of a stripping & scrubbing step in the recycle stream.