Dual valorization of sewage sludge ash through phosphorus recovery and wastewater remediation

Sewage sludge ash (SSA) can be exploited for phosphorus recovery, as it contains about 5-15% of this element by mass. However, residual waste remains and requires valorization to avoid disposal costs. This study investigates fluidized bed mono-combusted ash from sewage treatment for water remediation within a circular economy framework. Acid treatment, primarily applied for phosphorus extraction and recovery, was here followed by the valorization of the residual ash as an adsorbent, since this s