不同镁源对磷酸铁废水生成鸟粪石的效能

徐小虎; 沈耀良

doi:10.13205/j.hjgc.202409010

不同镁源对磷酸铁废水生成鸟粪石的效能

doi: 10.13205/j.hjgc.202409010

徐小虎¹,
沈耀良^1,2,3, ,

1. 苏州科技大学环境科学与工程学院, 江苏苏州 215000;
2. 城市生活污水资源技术国家地方联合工程实验室, 江苏苏州 215000;
3. 江苏省水处理技术与材料协同创新中心, 江苏苏州 215000

基金项目:

江苏省水处理技术与材料协同创新中心自主项目“污水处理节能和碳氮磷资源化关键技术研究”

详细信息

作者简介:
徐小虎(1998-),男,硕士研究生,主要研究方向为废水处理及资源化利用技术。919571089@qq.com

通讯作者:
沈耀良(1961-),男,教授,主要研究方向为污水生物处理理论与技术、污水处理资源化。ylshenniu@126.com

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出版历程
- 收稿日期: 2024-01-19
- 网络出版日期: 2024-12-02

EFFICIENCIES OF DIFFERENT MAGNESIUM SOURCES IN STRUVITE FORMATION FROM IRON PHOSPHATE WASTEWATER

XU Xiaohu¹,
SHEN Yaoliang^{1,2,3
, ,}

1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China;
2. National and Local Joint Engineering Laboratory of Urban Domestic Sewage Resources Technology, Suzhou 215000, China;
3. Jiangsu Provincial Collaborative Innovative Center of Water Treatment Technology and Materials, Suzhou 215000, China

摘要

摘要: 采用正交试验和单因素优化的方法,以海水、盐卤和工业氧化镁替代传统商业镁源,对磷酸铁废水中的磷生成鸟粪石(Struvite)的不同效能、鸟粪石的组分、影响因素及其条件的优化进行了比较分析。结果表明:以海水为镁源,在最佳反应pH=10、n(Mg)/n(P)=1.2、搅拌速度=200 r/min、反应时间=20 min时磷的去除率为93.2%,生成的鸟粪石纯度和产量分别为76.8%和522.5 g/m³,单位量Mg²⁺(1 g)获得的鸟粪石量为4.6 g;以工业MgO为镁源,在最佳反应条件pH=7、n(Mg)/n(P)=1.4、搅拌速度=250 r/min、反应时间=1 h时磷去除率达98.0%,生成的鸟粪石纯度和产量分别为78.0%和633.0 g/m³,单位量Mg²⁺(1 g)获得的鸟粪石量为5.0 g;盐卤被认为是本研究最优镁源,在最佳反应pH=10、n(Mg)/n(P)=1.4、搅拌速度=200 r/min、反应时间=30 min时,磷去除率达96.7%,生成的鸟粪石纯度和产量最高,为93.0%和674.2 g/m³,单位量Mg²⁺获得的鸟粪石量也最大,为5.1 g。综合对比,3种镁源中盐卤效果最佳,可作为最优镁源。
- 海水 /
- 盐卤 /
- 工业氧化镁 /
- 鸟粪石 /
- 磷酸铁废水
Abstract: The different efficiencies of struvite generation from phosphorus in iron phosphate wastewater, the components of struvite, the influencing factors, and the optimization of the conditions were compared and analyzed by using seawater, salt brine, and industrial magnesium oxide as the magnesium sources, using orthogonal test and one-way optimization method. The results showed that using seawater as the magnesium source, the phosphorus removal rate was 93.2% at the optimum reaction pH=10, n(Mg)∶n(P)=1.2, stirring speed=200 r/min, reaction time=20 min, and the purity and yield of struvite were 76.8% and 522.5 g/m³, respectively, and the amount of struvite per unit amount of Mg²⁺ (1 g) was 4.6 g; using industrial magnesium oxide as the magnesium source, the removal rate of phosphorus reached 98.0% at the optimal conditions of pH=7, n(Mg)∶n(P)=1.4, stirring speed=250 r/min, and reaction time=1 h, and the purity and yield of struvite were 78.0% and 633.0 g/m³, respectively, and the amount of struvite per unit of Mg²⁺ was 5.0 g. Salt brine can be used as the optimal magnesium source for this study, and at the optimum reaction of pH=10, n(Mg)∶n(P)=1.4, stirring speed=200 r/min, and reaction time=30 min resulted in 96.7% phosphorus removal, the highest purity and yield of 93.0% and 674.2 g/m³ of struvite, the maximum amount of struvite obtained per unit of Mg²⁺ was 5.1 g at the same time. By comprehensive comparison, the effect of salt brine among the three magnesium sources is the best, and it can be used as the optimal magnesium source.
- seawater /
- salt brine /
- industrial magnesium oxide /
- struvite /
- iron phosphate wastewater

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