Pig Slurry Concentration by Vacuum Evaporation: Influence of Previous Mesophilic Anaerobic Digestion Process

This study looked at removing water from pig slurry by evaporating it under vacuum to reuse the clean water. Researchers tested how different pH levels and whether the slurry was fresh or already digested affected the quality of the condensed water. They found that the amount of ammonia and other substances in the condensate depended strongly on the pH. Anaerobic digestion before evaporation had clear benefits, because it used up smelly and volatile compounds, helping produce cleaner condensed water and reducing pollution.