Improved anaerobic digestion of swine manure by simultaneous ammonia recovery using gas-permeable membranes

In feedstocks containing high ammonia (NH3) concentration, removal of the NH3 during anaerobic digestion (AD) process can improve AD performance. present study, effect using gas-permeable membrane (GPM) technology on performance and biogas production was investigated swine manure feedstock. Batch semi-continuous experiments were carried out under mesophilic conditions. reactor with recovery, total nitrogen (TAN) concentration reduced 28% in batch 23% average semicontinuous experiment compared without recovery. Free (FA) concentrations also decreased by 4% experiments, respectively. These reductions TAN FA GPM system positively impacted both quality quantity produced manure. Specifically, specific methane yield increased 9% 17% experiment. Furthermore, higher percentages obtained retrofitted system, 24% increase 11% (range 8.3-13.6%). Simultaneously, a uniform recovery rate 6.7 g N per m2 day for 205 days operation; recovered form ammonium sulphate solution. Therefore, AD-GPM configuration produces beneficial results while recovering sulphate.