LIUYu-sen,GAOMing-chang,SUNShao-fang,et al.Yeast Induced Magnesium Ammonium Phosphorus Crystallization for Treatment of Phosphorus-rich Sludge Supernatant[J].China Water & Wastewater,2022,38(11):1-6.
Yeast Induced Magnesium Ammonium Phosphorus Crystallization for Treatment of Phosphorus-rich Sludge Supernatant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第11期
Page:
1-6
Column:
Date of publication:
2022-06-01
- Keywords:
- yeast; magnesium ammonium phosphate (MAP); phosphorus-rich supernatant; crystalline products
- Abstract:
- A high-efficient phosphorus removal yeast strain, which can form local phosphorus rich areas during phosphorus removal, was introduced into magnesium ammonium phosphate (MAP) crystallization process to carry out a new technology for phosphorus removal and recovery. The effects of pH, Mg/P, N/P, reaction time and stirring intensity on the treatment efficiency of the phosphorus-rich supernatant from A2/O sludge thickener were investigated, and the crystalline products were characterized through scanning electron microscope coupled with energy dispersive spectrometer (SEM-EDS) and X-ray diffraction (XRD). The results showed that the optimal parameters were as follows: pH of 10.0, Mg/P of 2.0, N/P of 2.0, reaction time of 30 min, stirring intensity of 300 r/min. The effluent phosphorus concentration was 1.71 mg/L, and the phosphorus removal rate was 97.14% under optimal conditions. The analysis of crystallized product suggested that yeast could secrete lots of extracellular polymeric substances absorbing phosphorus and magnesium ion to form phosphorus-rich areas around yeast. MAP crystallization products formed outside the yeast cell to realize phosphorus removal and recovery.
Last Update:
2022-06-01