Migration and Transformation Characteristics of Organic Phosphorus in Municipal Sewage During Ozone-Based Advanced Oxidation

被引：0
|
作者：
Zhang Y. [1 ,2 ]
Shang W. [1 ]
Khu S.-T. [2 ]
Zheng X. [1 ]
Sun Y. [1 ]
Li P. [1 ]
机构：
[1] School of Environmental Science and Engineering, Tianjin University, Tianjin
[2] North China Municipal Engineering Design & Research Institute Co.，Ltd., Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2024年 / 57卷 / 03期
基金：
中国博士后科学基金;
关键词：
H[!sub]2[!/sub]O[!sub]2[!/sub; migration; municipal sewage; organic phosphorus(OP); ozone; transformation characteristics;
D O I：
10.11784/tdxbz202301022
中图分类号：
学科分类号：
摘要：
At present，the structural composition，migration，and transformation of organic phosphorus(OP)in municipal sewage treatment plants are not fully clear. In addition，the proportion of OP in effluents is high. In this study，the migration and transformation characteristics of phosphorus composition in an advanced oxidation technology based on ozonation were evaluated. Further，the degradation efficiencies of OP in sole ozonation and the O3/H2O2 process were compared. The conversion mechanism of different components of phosphorus and the residual refractory OP components in ozonation were analyzed comprehensively through 31P NMR and Fourier-transform infrared(FT-IR) spectroscopy. In sole ozonation，with an increase in the ozone dosage，the observed rate constant(kobs)of UV254 removal was 11.2 times that of the COD removal and 21.0 times that of the OP removal，indicating that ozone has a strong oxidation effect on organic matter that contains unsaturated bonds； however，the effect was weak for the refractory OP. The residual OP components were phosphomonoesters and phosphonates. Phosphodiester was easily decomposed into phosphomonoesters，other intermediates，and PO34- by ozonation. The residual OP was degraded effectively by the O3/H2O2 process. When the ozone dosage was 2.20 mg (O3)/mg (COD)，the optimal concentration of H2O2 was 2.45 mmol/L，and the OP removal rate was higher than 80%；the OP gradually converted to PO34- . However，there was no enhancement effect on OP removal when the H2O2 dosage was lower than 0.33 mmol/L because of the strong trapping effect of chloride ions and carbonate on the produced ·OH. These findings may motivate the development of new，advanced approaches and methods for phosphorus removal from municipal sewage and safe utilization of water technology. Further，it is important to study the migration and transformation characteristics of phosphor components in the advanced oxidation technology based on ozone as they are critical for selecting an advanced phosphorus removal process. © 2024 Tianjin University. All rights reserved.
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页码：265 / 275
页数：10
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