The contribution of exopolysaccharides induced struvites accumulation to ammonium adsorption in aerobic granular sludge.
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.
Department of biotechnology, Delft university of Technology, Julianalaan 67, 2628BC Delft, The Netherlands. Yuemei.Lin@tudelft.nl
Y M
YM
Lin
J P
JP
Bassin
M C M
MC
van Loosdrecht
D000327:Adsorption / Q000187:drug effects; D000332:Aerobiosis / Q000187:drug effects; D000464:Alginates / Q000302:isolation & purification / Q000494:pharmacology; D000693:Anaerobiosis / Q000187:drug effects; D001673:Biodegradation, Environmental / Q000187:drug effects; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D011232:Chemical Precipitation; D003460:Crystallization; D020723:Glucuronic Acid / Q000302:isolation & purification / Q000494:pharmacology; D006603:Hexuronic Acids / Q000302:isolation & purification / Q000494:pharmacology; D007477:Ions; D017616:Magnesium Compounds / Q000302:isolation & purification*; D009566:Nitrates / Q000032:analysis; D009573:Nitrites / Q000032:analysis; D010710:Phosphates / Q000302:isolation & purification*; D010758:Phosphorus / Q000032:analysis; D011134:Polysaccharides / Q000302:isolation & purification / Q000494:pharmacology*; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification*; D012722:Sewage / Q000382:microbiology*; D012995:Solubility / Q000187:drug effects; D000069877:Struvite; D013696:Temperature; D014961:X-Ray Diffraction
D000464:Alginates; D006603:Hexuronic Acids; D007477:Ions; D017616:Magnesium Compounds; D009566:Nitrates; D009573:Nitrites; D010710:Phosphates; D011134:Polysaccharides; D000644:Quaternary Ammonium Compounds; D012722:Sewage; D010758:Phosphorus; D020723:Glucuronic Acid; D000069877:Struvite