Shin, Bora Kim, Choah Cho, Jinsoo SONG, KYUNG GUEN 2025-09-30T06:30:54Z 2025-09-30T06:30:54Z 2025-09-30 2026-01 0960-8524 https://pubs.kist.re.kr/handle/201004/153266 This study evaluates ammonia gas recovery from high-strength anaerobic digestate using a bipolar membrane electrodialysis (BPED) and membrane contactor (MC). Ammonia is a promising carbon-neutral energy carrier, while digestates present both environmental challenges and opportunities for ammonia recovery. The BPED was tested at 2,000 10,000 mg-N/L under varying voltages and flow rates, achieving up to 87.6 % ammonium separation at 10,000 mg-N/L. Subsequently, the MC enabled direct gas-phase NH3 recovery, using synthetic base solutions under different vacuum pressures and sweep gas flow rates. Recovery reached 80.9 % at low gas-to-liquid ratios (180-720), outperforming air stripping. Ammonia recovery followed first-order kinetics, with overall mass transfer (K & sdot;a) governed by vacuum pressure, sweep gas, and pH-dependent speciation. NH3-N flux showed nonlinear dependence on the ionization fraction (alpha 1), underscoring synergistic effects of pH and gas-phase configuration. The BPED-MC offers a scalable, chemical-free, and energy-efficient approach for sustainable ammonia recovery from high-ammonia waste streams. English Elsevier BV Synergistic ammonia recovery from high-ammonia anaerobic digestate via coupled bipolar electrodialysis and membrane contactor system Article 10.1016/j.biortech.2025.133293 1 Bioresource Technology, v.439 Bioresource Technology 439 N scie scopus 001572945300001 2-s2.0-105015879965 Agricultural Engineering Biotechnology & Applied Microbiology Energy & Fuels Agriculture Biotechnology & Applied Microbiology Energy & Fuels Article MANURE REMOVAL WASTE WATER DISTILLATION PRETREATMENT NITROGEN BPED-MC system Gas-phase separation Ammonia mass transfer NH3 recovery system High concentration ammonia digestate