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以鸟粪石形式从剩余污泥中回收氮和磷

DOI: 10.11830/ISSN.1000-5013.2013.04.0429

Keywords: 污泥, 厌氧发酵, 氨氮, 正磷酸盐, 鸟粪石

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Abstract:

以鸟粪石形式从固体废弃物――剩余污泥中回收氮磷,探讨pH值和发酵时间对污泥发酵溶出氮和磷的影响,以及Mg和P摩尔比对回收磷的影响.结果表明:在强酸或强碱条件下,溶出的氮、磷的质量浓度较高,而且随着发酵时间延长,发酵液中氨氮与正磷酸盐质量浓度增加,其最佳发酵时间为2 d.此外,随着投加镁的增加,氮磷回收率增加,当发酵液中Mg和P的摩尔比为1.2∶1时,磷的回收率最高.对回收产物进行组分分析、电镜扫描与X射线衍射分析,证明沉淀主要成分为鸟粪石.

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