Ammoniacal nitrogen recovery from swine slurry using a gas-permeable membrane: pH control strategies and feed-to-trapping volume ratio.

ABSTRACT: Gas-permeable membrane (GPM) technology is gaining interest to recover nitrogen from residual effluents due to its effectiveness, simple operation and capacity of producing a nutrient rich product with fertilising value. In this study, a GPM contactor was used at 25 °C to recover total ammoniacal nitrogen (TAN) from swine slurry as a concentrated (NH₄)₂SO₄ solution. Firstly, a synthetic solution was tested on a wide pH range (6-12). Results showed that the ammonia mass transfer constants (K_m) increased from 7.9·10^-9 to 1.2·10^-6 m/s as the pH increased. The reagent consumption to control the pH per mole nitrogen recovered had a minimum at pH 9, which showed a K_m value of 3.0·10^-7 m/s. Secondly, various p

SUBMITTER: Serra-Toro A 

PROVIDER: S-EPMC12696102 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature