| 从剩余污泥厌氧发酵上清液中以鸟粪石形式回收磷 |
| 摘要点击 3138 全文点击 1001 投稿时间：2018-11-30 修订日期：2019-03-21 |
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| 中文关键词 剩余污泥 厌氧发酵 氨氮 磷酸盐 鸟粪石 |
| 英文关键词 excess sludge anaerobic fermentation ammonia nitrogen phosphate struvite |
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| 中文摘要 |
| 为了实现以鸟粪石（MAP，MgNH4PO4·6H2O）的形式回收剩余污泥厌氧发酵上清液中的氮磷，研究了氮磷溶出的最佳条件及不同的反应条件对氮磷回收的影响.结果表明在pH为10.5，温度为35℃时，发酵液中溶出的氨氮与正磷酸盐质量浓度皆在第5 d达到峰值；在添加磷源的条件下，磷回收的最佳条件为pH=9.5、N：P=0.8、Mg：P=1.8；未添加磷源的条件下，回收磷的最佳条件为pH=9.5、Mg：P=1.6、转速200 r·min-1.此外，降低N：P摩尔比对于鸟粪石的形态和纯度均有显著影响.利用扫描电镜（SEM）、X光微区分析（EDS）、X射线衍射（XRD）和傅里叶红外光谱（FTIR）等手段对回收产物进行了表面相貌及物相组成分析，证实了沉淀物的主要成分为MAP.以鸟粪石形式回收剩余污泥中的氮磷，是实现污泥资源化的一种有效手段. |
| 英文摘要 |
| 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. |
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