Ammonium removal by struvite precipitation with cheap magnesia

YU Rongtai; HUANG Ping; REN Hongqiang; XIE Zhipeng; WANG Chang'an; MA Xiang

doi:10.11949/j.issn.0438-1157.20150857

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Ammonium removal by struvite precipitation with cheap magnesia

更新时间：2025-12-10

- Ammonium removal by struvite precipitation with cheap magnesia
- CIESC Journal Issue 12, Pages: 5040-5044(2015)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150857
  CLC： 703
- Online First：05 December 2015，
  
  Published：05 December 2015
- 稿件说明：
移动端阅览
YU Rongtai, HUANG Ping, REN Hongqiang, et al. Ammonium removal by struvite precipitation with cheap magnesia[J]. CIESC Journal, 2015, (12): 5040-5044.
DOI：

YU Rongtai, HUANG Ping, REN Hongqiang, et al. Ammonium removal by struvite precipitation with cheap magnesia[J]. CIESC Journal, 2015, (12): 5040-5044. DOI： 10.11949/j.issn.0438-1157.20150857.

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。

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.

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