Ammonia stripping from buffalo manure digestate for future nitrogen upcycling into bio-based products

Abstract

Mitigating ammonia emissions from the livestock sector offers the opportunity to combine environmental protection with resource recovery through emerging circular bioeconomy approaches. In this work, we tested the potential of low-rate stripping techniques to enable techno-economically feasible nitrogen recovery and valorization from buffalo manure digestate. The proposed process achieved more than 80% ammonia stripping at mild temperatures (35-55 °C) and without the need of caustic agents to increase pH. Coupling such low-rate ammonia stripping with innovative biological resource valorization processes could offer interesting future perspectives.