Environmental Technology & Innovation, Год журнала: 2024, Номер 33, С. 103535 - 103535

Опубликована: Янв. 8, 2024

Phosphogypsum (PG) is the largest by-product of phosphate industry. Nearly 300 M tons PG are annually discarded, which 58% dry stacked. The exposure stacks to rainwater and processed waters moisture creates hydraulic pressure, generating acidic leachates into nearby aquifer systems. Because its elevated levels sulfates, phosphorus (P) heavy metals, water leachate can negatively affect surrounding environments. This work investigates effect activity on leaching, by studying different PG:Water ratios leaching process, followed anaerobic bioremediation through biological sulfate removal (BSRA). later involves using sulfate-reducing bacteria consortium within an bioreactor, allowing a simultaneous monitoring leachate's biochemical changes, impurities removal, microbial community dynamics results determined highest sulfates from with ratio 1:200 (w:v). Subsequently, treatment exhibited efficient (79%), P (99%) chemical oxygen demand (93%), substantial decline in metal concentrations (Cd, As Al 99%, Zn 70%) leachate. Moreover, acidity was also neutralized SRA process increasing pH 4 7.52. Furthermore, unveiled significant correlation between changes co-existence specific phyla, including Desulfobacterota, Firmicutes, Proteobacteria, eco-friendly

Язык: Английский