Energy-Efficient Ammonia Recovery in an Up-Scaled Hydrogen Gas Recycling Electrochemical System.

ABSTRACT: Nutrient and energy recovery is becoming more important for a sustainable future. Recently, we developed a hydrogen gas recycling electrochemical system (HRES) which combines a cation exchange membrane (CEM) and a gas-permeable hydrophobic membrane for ammonia recovery. This allowed for energy-efficient ammonia recovery, since hydrogen gas produced at the cathode was oxidized at the anode. Here, we successfully up-scaled and optimized this HRES for ammonia recovery. The electrode surface area was increased to 0.04 m² to treat up to 11.5 L/day (∼46 g_N/day) of synthetic urine. The system was operated stably for 108 days at current densities of 20, 50, and 100 A/m². Compared to our previous prototype, this new cell design reduced the anode overpotential and io

SUBMITTER: Kuntke P 

PROVIDER: S-EPMC5989698 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature