This study integrates urban water management by linking iron salt production, its application in urban water systems, and high-quality bioenergy recovery from wastewater. An iron-oxidizing electrochemical cell removes CO2 (along with H2S and NH3) from biogas, upgrading it while producing FeCO3. This FeCO3 effectively removes sulfide and phosphate from wastewater and sludge, improving sludge settleability and dewaterability. The process offers a self-reliant, secure, and environmentally friendly iron salt supply chain for water utilities, reducing costs and improving bioenergy recovery.
