Part 3: Nitrogen recovery technologies

Abstract

Dairy farms are looking for ways to further partition and recover concentrated nutrient components of nitrogen, phosphorus, and potassium, from manure that has been preprocessed, typically with anaerobic digestion and/or initial manure separation. Advanced manure treatment technologies for nitrogen recovery and removal including nitrification-denitrification, vermifiltration, and ammonia stripping are reviewed with a comparison of relative costs and efficiencies.