A Systematic Study of Ammonia Recovery from Anaerobic Digestate Using Membrane-Based Separation.

ABSTRACT: Ammonia recovery from synthetic and real anaerobic digestates was accomplished using hydrophobic flat sheet membranes operated with H2SO4 solutions to convert ammonia into ammonium sulphate. The influence of the membrane material, flow rate (0.007, 0.015, 0.030 and 0.045 m3 h-1) and pH (7.6, 8.9, 10 and 11) of the digestate on ammonia recovery was investigated. The process was carried out with a flat sheet configuration at a temperature of 35 °C and with a 1 M, or 0.005 M, H2SO4 solution on the other side of the membrane. Polytetrafluoroethylene membranes with a nominal pore radius of 0.22 µm provided ammonia recoveries from synthetic and real digestates of 84.6% ± 1.0% and 71.6% ± 0.3%, respectively, for a membrane area of 8.6 × 10-4 m2 and a reservoir volume of 0.5 L, in 3.5 h with a 1 M

SUBMITTER: Rivera F 

PROVIDER: S-EPMC8777830 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature