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

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Ammonium removal by struvite precipitation with cheap magnesia

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

  1. 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).

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. 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
  • 通讯作者: 余荣台
  • 基金资助:

    国家自然科学基金项目(51178216)。

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+:PO43-, 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

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+:PO43- 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

CLC Number: