Abstract
Aerobic granular sludge from a lab-scale reactor with simultaneous nitrification/denitrification and enhanced biological phosphorus removal processes exhibited significant amount of ammonium adsorption (1.5 mg NH4+-N/g TSS at an ammonium concentration of 30 mg N/L). Potassium release accompanied ammonium adsorption, indicating an ion exchange process. The existence of potassium magnesium phosphate (K-struvite) as one of potassium sources in the granular sludge was studied by X-ray diffraction analysis (XRD). Artificially prepared K-struvite was indeed shown to adsorb ammonium. Alginate-like exopolysaccharides were isolated and their inducement for struvite formation was investigated as well. Potassium magnesium phosphate proved to be a major factor for ammonium adsorption on the granular sludge. Struvites (potassium/ammonium magnesium phosphate) accumulate in aerobic granular sludge due to inducing of precipitation by alginate-like exopolysaccharides.
Copyright © 2011 Elsevier Ltd. All rights reserved.
Publication types
-
Research Support, Non-U.S. Gov't
MeSH terms
-
Adsorption / drug effects
-
Aerobiosis / drug effects
-
Alginates / isolation & purification
-
Alginates / pharmacology
-
Anaerobiosis / drug effects
-
Biodegradation, Environmental / drug effects
-
Biomass
-
Bioreactors / microbiology
-
Chemical Precipitation
-
Crystallization
-
Glucuronic Acid / isolation & purification
-
Glucuronic Acid / pharmacology
-
Hexuronic Acids / isolation & purification
-
Hexuronic Acids / pharmacology
-
Ions
-
Magnesium Compounds / isolation & purification*
-
Nitrates / analysis
-
Nitrites / analysis
-
Phosphates / isolation & purification*
-
Phosphorus / analysis
-
Polysaccharides / isolation & purification
-
Polysaccharides / pharmacology*
-
Quaternary Ammonium Compounds / isolation & purification*
-
Sewage / microbiology*
-
Solubility / drug effects
-
Struvite
-
Temperature
-
X-Ray Diffraction
Substances
-
Alginates
-
Hexuronic Acids
-
Ions
-
Magnesium Compounds
-
Nitrates
-
Nitrites
-
Phosphates
-
Polysaccharides
-
Quaternary Ammonium Compounds
-
Sewage
-
Phosphorus
-
Glucuronic Acid
-
Struvite