Innovative Approach to Sustainable Fertilizer Production: Leveraging Electrically Assisted Conversion of Sewage Sludge for Nutrient Recovery

Efforts addressing
sludge management, food security, and resource
recovery have led to novel approaches in these areas. Electrically
assisted conversion of sludge stands out as a promising technology
for sewage sludge valorization, producing nitrogen and phosphorus-based
fertilizers. The adoption of this technology, which could lead to
a fertilizer circular economy, holds the potential to catalyze a transformative
change in wastewater treatment facilities toward process intensification,
innovation, and sustainability. This paper provides insights into
the economic aspects of the technology, policy considerations, and
challenges involved in realizing the potential of electrified processes
for sludge valorization. To demonstrate the impact of the technology,
a case study for its implementation in the United States assuming
the municipal wastewater treatment plants market is discussed. It
was found that electrically assisted sludge conversion could enable
the recovery of nitrogen and phosphorus from waste, representing up
to 9% of the nitrogen and 32% of the phosphorus consumption of the
U.S. for fertilizer use. This technology also enables full electrification
and modularization of the process, thereby presenting significant
economic and environmental opportunities.