| 海水为镁源的鸟粪石结晶法回收氮磷的研究 |
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| 引用本文： | 张萍,许强,钱清华.海水为镁源的鸟粪石结晶法回收氮磷的研究[J].连云港职业技术学院学报,2020(1):13-16. |
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| 作者姓名： | 张萍 许强 钱清华 |
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| 作者单位： | 连云港职业技术学院科技产业处;连云港职业技术学院公共管理学院;连云港职业技术学院医药与化学工程学院 |
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| 基金项目： | 连云港市“521”项目资助(2017001)。 |
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| 摘 要： | 鸟粪石结晶法(MgNH4PO4·6H2O,MAP)回收废水中氮磷的研究越来越受到关注。由于废水中镁的含量相对于氮和磷低,因此通常需要添加镁盐。利用海水作为低成本镁源,考察了pH、Mg/P和N/P摩尔比、反应时间及杂离子对氮磷回收率和鸟粪石纯度的影响。结果显示,鸟粪石形成速度快,10min内就能完成。当3种构晶离子摩尔比Mg^2+]:NH^4+]:PO43^-]为1.4:1.0:1.1,pH为9.5时,氮磷回收率分别为88.4%和96.9%。对合成鸟粪石进行了化学成分和XRD分析,海水合成鸟粪石的纯度为83.19%,与MgCl2作为镁源相当。
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| 关 键 词： | 海水 鸟粪石 氮回收 磷回收 |
Recovery of Nitrogen and Phosphorus through Struvite Crystallization Using Seawater as Magnesium Source |
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| ZHANG Ping,XU Qiang,QIAN Qinghua.Recovery of Nitrogen and Phosphorus through Struvite Crystallization Using Seawater as Magnesium Source[J].Journal of Lianyungang Technical College,2020(1):13-16. |
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| Authors: | ZHANG Ping XU Qiang QIAN Qinghua |
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| Institution: | (Department of Science and Technology Industry,Lianyungang Technical College,Lianyungang 222006,China;School of Public Administration,Lianyungang Technical College,Lianyungang 222006,China;School of Medicine and Chemical Engineering,Lianyungang Technical College,Lianyungang 222006,China) |
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| Abstract: | Recovery of nitrogen and phosphorus in wastewater through crystallization of struvite(MgNH4PO4·6H2O)has gained increasing interest.Since the content of magnesium in wastewater is low relative to nitrogen and phosphorus,magnesium salt is usually added.Seawater is used as a low-cost source of Mg2+,and the effect of pH,the mole ratio of Mg/P and N/P,the reaction time and impurity ion on the recovery rate of nitrogen and phosphorus as well as purity of struvite is observed.The findings show struvite formation proceeds rapidly and is completed within10 min.When the mole ratio of the three structured crystal ionsMg2+]:NH4+]:PO43-]is 1.4∶1.0∶1.1 and pH is 9.5,the recovery rate of nitrogen and phosphorus is 88.4%and 96.9%respectively.The chemical composition and XRD of synthetic struvite are analyzed.The purity of synthetic struvite through seawater is 83.18%,which is equivalent to that of MgCl2 used as a Mg2+source. |
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| Keywords: | seawater struvite nitrogen recovery phosphorus recovery |
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