Optimization of BPMED for the recovery of ammonia and citric acid from ammonium citrate scrubber effluents by response surface methodology

The excessive nitrogen in waterbodies, often caused by the discharge of ammonia-rich wastewaters, leads to eutrophication, disrupting aquatic ecosystems. Wastewater treatment plants play an important role in the removal and recovery of nitrogen from wastewater streams, thereby preventing pollution. Air stripping in combination with acid...

Recovery of sulfuric acid and ammonia from scrubber effluents using bipolar membrane electrodialysis: Effect of pH and temperature

Simulated ammonium sulfate scrubber effluent was treated using bipolar membrane electrodialysis (BPMED) to recover sulfuric acid for reuse in the scrubber, and ammonium hydroxide as a product, without using any chemicals. The effect of pH and temperature of the feed solution on the energy consumption of the BPMED and the purity of the...

Evaluation of organic acids as scrubbing agents for ammonia recovery from wastewater through Aspen Plus® simulations

This study evaluates the effectiveness of organic acids, specifically citric acid, lactic acid, and malic acid, as scrubbing agents for ammonia (NH3) recovery from waste air streams. The acid scrubbing process was modeled using Aspen Plus® and validated against sulfuric acid scrubbing process data available in the literature. The effects of...

Fuelling a solid oxide fuel cell with ammonia recovered from water by vacuum membrane stripping

Gaseous ammonia (NH3) recovered from residual waters may be used as a fuel in solid oxide fuel cells (SOFCs) to generate electricity without emission of undesirable oxidised nitrogen species. NH3 can be directly recovered from water as a gas by vacuum membrane stripping (VMS), which also results in the evaporation of water (H2O), leading to the...

Bipolar membrane electrodialysis for energetically competitive ammonium removal and dissolved ammonia production

Removal of ammoniacal nitrogen from residual waters traditionally relies on energy-consuming biochemical processes, while more novel alternative strategies focus on the recovery of total ammoniacal nitrogen for the production of fertilisers or the generation of energy. The recovery of total ammoniacal nitrogen as gaseous ammonia is more...