کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4482867 | 1316872 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The contribution of exopolysaccharides induced struvites accumulation to ammonium adsorption in aerobic granular sludge The contribution of exopolysaccharides induced struvites accumulation to ammonium adsorption in aerobic granular sludge](/preview/png/4482867.png)
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.
► Potassium magnesium phosphate (K-struvite) accumulated in aerobic granular sludge.
► K-struvite was found to be a potassium source for ion exchange with ammonium.
► The formation of struvites is induced by alginate-like exopolysaccharides.
Journal: Water Research - Volume 46, Issue 4, 15 March 2012, Pages 986–992