Effect of iron ions (Fe 2+ , Fe 3+ ) on the formation and structure of aerobic granular sludge

摘要: Aerobic granulation is a promising technology for wastewater treatment, but problems regarding its formation and stability need to be solved. Divalent metal ions, especially Ca2+, Mg2+ Mn2+, have been demonstrated play an important role in the process of aerobic granulation. Here, we studied whether iron ions can affect Granular sludge formed without ion addition (<0.02 mg Fe2+ L-1) was fluffy had finger-type structure filamentous out-growth. The concentrations 1 10 mg L-1 repressed results show that chemical precipitation granules with higher than ferrous addition. amount precipitates inside outside. This study demonstrates (Fe2+/Fe3+) increase size granular do not time, which time first observed. shows confidently applied actual containing high concentration compounds.