廉价氧化镁回收废水中氨氮

doi:10.11949/j.issn.0438-1157.20150857

化工学报 ›› 2015, Vol. 66 ›› Issue (12): 5040-5044.DOI: 10.11949/j.issn.0438-1157.20150857

廉价氧化镁回收废水中氨氮

余荣台¹, 黄平¹, 任洪强², 谢志鹏³, 汪长安³, 马湘¹

1 景德镇陶瓷学院材料科学与工程学院, 江西景德镇 333001;
2 南京大学污染控制与资源化研究国家重点实验室, 江苏南京 210023;
3 清华大学材料学院, 北京 100084

收稿日期:2015-06-08 修回日期:2015-07-03 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: 余荣台
基金资助:
国家自然科学基金项目(51178216)。

Ammonium removal by struvite precipitation with cheap magnesia

YU Rongtai¹, HUANG Ping¹, REN Hongqiang², XIE Zhipeng³, WANG Chang'an³, MA Xiang¹

1 School of Materials Science and Engineering, Jingdezhen Ceramic College, Jingdezhen 333001, Jiangxi, China;
2 State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China;
3 School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Received:2015-06-08 Revised:2015-07-03 Online:2015-12-05 Published:2015-12-05
Supported by:
supported by the National Natural Science Foundation of China (51178216).

摘要/Abstract

摘要：

药剂成本过高是阻碍磷酸铵镁结晶技术推广应用的关键难题之一。通过改变结晶反应的初始条件,采用廉价氧化镁为镁盐,有效回收废水中的氨氮。研究结果表明,起始pH为2时,氧化镁为镁盐时,废水氨氮去除效率达到90%以上;采用Mg²⁺:NH₄⁺:PO₄^3- 摩尔比为1:1:1,煅烧温度在200～400℃时,氨氮回收率超过82%;XRD和FTIR分析结果表明,不同温度条件下,氧化镁的晶体结构出现畸变,导致Mg O键键长出现变化,红外光谱出现红移及蓝移现象,而Mg O键键长的变化与沉氨效率存在直接的相关性。

关键词: 廉价氧化镁, 磷酸铵镁, 化学过程, 回收, 废水

Abstract:

The high cost of magnesium is one of the key problems for the practical application of struvite chemical precipitation. Ammonium in wastewater was recycled by changing the initial conditions of struvite precipitation with cheap magnesia. The results showed that when the initial pH was 2, the removal rate of ammonium was above 90% by struvite precipitation technology with cheap magnesia as magnesium, which was above 82% at the conditions of the mole ratio of Mg²⁺:NH₄⁺:PO₄^3-, 1:1:1 and calcination temperature of magnesia of 200-400℃. The XRD and FTIR results also showed that the crystal structure of magnesia was distorted with changed bond length of Mg O at different calcination temperature, leading to redshift and blueshift. A direct correlation was found between Mg O bond length and ammonium removal ratio.

Key words: cheap magnesia, struvite, chemical processes, recovery, wastewater

中图分类号:

X703

余荣台, 黄平, 任洪强, 谢志鹏, 汪长安, 马湘. 廉价氧化镁回收废水中氨氮[J]. 化工学报, 2015, 66(12): 5040-5044.

YU Rongtai, HUANG Ping, REN Hongqiang, XIE Zhipeng, WANG Chang'an, MA Xiang. Ammonium removal by struvite precipitation with cheap magnesia[J]. CIESC Journal, 2015, 66(12): 5040-5044.

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廉价氧化镁回收废水中氨氮

Ammonium removal by struvite precipitation with cheap magnesia

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