Gas-Permeable Membrane Technology Coupled With Anaerobic Digestion for Swine Manure Treatment

Hydrophobic membranes for ammonia recovery from digestates in microbial electrolysis cells: Assessment of different configurations

“…The obtained results agree with the observations of other studies, which reported an increase in ammonia flux through tubular gas permeable membranes when increasing pH or ammonium concentration of the substrate [25,30,49,69,70].…”

“…Recently, hydrophobic membranes made of polypropylene (PP), polyvinylidene fluoride (PVDF) or polytetrafluoroethylene (PTFE), permeable to gases, are being applied to ammonia recovery, in the form of flat, tubular, or hollow fibre membranes [23][24][25][26]. This technology has been tested in anaerobic digestion [27][28][29][30][31][32] or from raw manure [33][34][35][36][37], among other substrates. Recovery efficiencies of more than 97% have been achieved in these assays.…”

Sustainable nutrient recovery from animal manure: A review of current best practice technology and the potential for freeze concentration

“…They reported that the separation and filtration of P and N are correlated to pH, membrane electric charge, and ionic speciation. Molinuevo-Salces et al (2018) investigated the performance of two anaerobic digesters coupled to gas-permeable membrane technologies, targeting the recovery of N from liquid manures in a concentrated stable ammonium solution and achieved ammonia and organic matter removal efficiencies of 96% and 69%, respectively; the final product could be used as a stable fertilizing salt solution. A recent study conducted by Shi et al (2020) assessed the application of three bipolar membrane electro-dialysis (BMED) units configured for nutrient recovery from animal manure.…”

Energy and Nutrients from Apple Waste Using Anaerobic Digestion and Membrane Technology

“…In this way, the treated digestate can be applied in the field to provide the advantages of a fertilizer rich in organic matter, but without N excess. The GPM technology has been successfully used in several studies for N recovery from such organic wastes as SM, obtaining N recovery percentages up to 98% [22][23][24], and from different digestates generated in anaerobic co-digesting systems, with N recovery percentages up to 99% [6,25,26]. Some of these studies used SM co-digested with organic co-substrates, such as fruit and vegetable sludge from peppers and artichokes, as well as by-products of the tomato processing industry [26], or tobacco powder and cereal powder [6].…”