Recovery of Phosphorus in the Form of Struvite from the Anaerobic Fermentation Supernatant of Excess Sludge

被引：0
|
作者：
Chang X. [1 ]
Zeng W. [1 ]
Wang B.-G. [1 ]
Xu H.-H. [1 ]
机构：
[1] National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing
来源：
Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 09期
关键词：
Ammonia nitrogen; Anaerobic fermentation; Excess sludge; Phosphate; Struvite;
D O I：
10.13227/j.hjkx.201811258
中图分类号：
学科分类号：
摘要：
To recover nitrogen and phosphorus from the supernatant of anaerobic fermentation of excess sludge in the form of struvite (MAP, MgNH4PO4•6H2O), the optimum conditions of nitrogen and phosphorus dissolution and the effects of different reaction conditions on nitrogen and phosphorus recovery were studied. The results showed that the concentration of ammonia nitrogen and orthophosphate that dissolved in the fermentation liquid peaked on the fifth day of the experiment at pH 10.5 and 35℃. When a phosphorus source was and was not added, the optimum conditions for recovering phosphorus were pH=9.5, N:P=0.8, and Mg:P=1.8 and pH=9.5, Mg:P=1.6, and speed=200 r•min-1, respectively. In addition, reducing the N:P molar ratio had a significant effect on the morphology and purity of the struvite. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) were used to analyze the surface appearance and phase composition of the recovered products. The main component of the precipitate was MAP. Recovery of nitrogen and phosphorus in excess sludge in the form of struvite is an effective means for realizing sludge resource utilization. © 2019, Science Press. All right reserved.
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页码：4169 / 4176
页数：7
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