Ferric iron enhances granule densification and pollutant removal in microalgal-bacterial granular sludge via iron-homeostatic microbial rewiring.
Microalgal-bacterial granular sludge (MBGS) is a promising low-energy wastewater treatment technology, but the role of Fe3+ concentration in regulating its structure and function remains unclear. MBGS was cultivated under four Fe3+ concentrations (0.1, 1, 3, and 5 mg/L). At 5 mg/L Fe3+, granules became more compact, wi...