Page 178 - 《精细化工》2022年第7期

第 39 卷第 7 期 精 细 化 工 Vol.39, No.7
2022 年 7 月 FINE CHEMICALS July 2022

水处理技术与环境保护
吸附-磷酸铵镁结晶耦合法去除低浓度氨氮

2
1
1*
1
2
黄高鑫 ，唐玉朝 ，伍昌年 ，刘 俊 ，宋永莲
(1. 安徽建筑大学 水污染控制与废水资源化安徽省重点实验室，安徽 合肥 230601；2. 安徽中环环保科
技股份有限公司，安徽 合肥 230001)
摘要：以活性白土（AC）、氯化镁和氢氧化钠为原料，通过复合改性制得载镁活性白土（AC-Mg），将其作为
高效吸附剂，并与模拟污水中的低浓度氨氮和磷发生磷酸铵镁结晶反应。对改性活性白土和反应后的回收产物
采用 BET、XRD、SEM、FTIR 和激光粒度分析仪进行了表征。探究了吸附-磷酸铵镁结晶耦合法对低浓度氨氮
去除和回收的机理，考察了磷源质量浓度、反应温度和溶液初始 pH 对氨氮去除效果的影响。结果表明，氧化
镁负载量为 0.85%的 AC-Mg（以改性活性白土复合材料的质量为基准，下同），在氨氮质量浓度为 60 mg/L，AC-Mg
投加量为 5 g/L，磷源质量浓度为 60 mg/L，温度为 25 ℃，pH 为 9.0 条件下，反应 2.5 h 可达到去除平衡，AC-Mg
2
对氨氮的去除量为 6.79 mg/g，去除率为 56.58%。AC-Mg 对氨氮的去除过程符合准二级动力学模型（R ＞0.98），
2
氨氮的吸附受到表面扩散和内部扩散共同作用。吸附过程符合 Langmuir 模型（R =0.9923），氨氮最大去除量为
37.05 mg/g。其中，吸附去除量为 5.56 mg/g，磷酸铵镁结晶反应去除量为 31.49 mg/g。
关键词：活性白土；磷酸铵镁；复合改性；反应动力学；吸附等温线；水处理技术
中图分类号：X703 文献标识码：A 文章编号：1003-5214 (2022) 07-1464-10

Low concentration ammonia nitrogen removal via
adsorption-struvite crystallization coupling method

1
1*
1
2
2
HUANG Gaoxin , TANG Yuchao , WU Changnian , LIU Jun , SONG Yonglian
(1. Anhui Key Laboratory of Water Pollution Control and Wastewater Recycling, Anhui Jianzhu University, Hefei 230601,
Anhui, China; 2. Anhui Zhonghuan Environmental Protection Technology Co., Ltd., Hefei 230001, Anhui, China)
Abstract: Active clay loaded with magnesium (AC-Mg) was prepared by composite modification using
active clay (AC), magnesium chloride and sodium hydroxide as raw materials, and then used as an efficient
adsorbent to remove low concentration ammonia nitrogen and phosphorus by magnesium ammonium
phosphate precipitation in simulated sewage. The AC-Mg obtained and products recovered from simulated
sewage were characterized by BET, XRD, SEM, FTIR and laser particle size analyzer, followed by
exploration on the mechanism of low concentration ammonia nitrogen removal and recovery by adsorption-
magnesium ammonium phosphate crystallization coupling method with the effects of mass concentration of
phosphorus source, reaction temperature and initial pH of solution on ammonia nitrogen removal investigated.
The results showed that the removal equilibrium could be achieved under the conditions of AC-Mg
magnesium oxide loading (based on the mass of modified active clay composite, the same below) 0.85%,
ammonia nitrogen mass concentration 60 mg/L, AC-Mg dosage 5 g/L, phosphorus source mass concentration
60 mg/L, temperature 25 ℃, pH 9.0, and reaction time 2.5 h with ammonia nitrogen removal capacity by
AC-Mg 6.79 mg/g, and the removal rate 56.58%. The removal process of ammonia nitrogen by AC-Mg
2
conformed to the quasi-second-order kinetic model (R > 0.98), and the adsorption of ammonia nitrogen
was influenced by both surface and internal diffusion. The adsorption process was in accordance with
2
Langmuir model (R =0.9923), and the maximum ammonia nitrogen removal was 37.05 mg/g, of which

收稿日期：2021-12-14; 定用日期：2022-06-11; DOI: 10.13550/j.jxhg.20211283
基金项目：国家自然科学基金（51978003，51578002）；安徽省高校自然科学研究重大项目（NO.KJ2019ZD54）
作者简介：黄高鑫（1995—），男，硕士生，E-mail：hgx161843011@163.com。联系人：唐玉朝（1975—），男，教授，E-mail：tangyc@
ahjzu.edu.cn。