城市污水中残留纳米颗粒对氯化消毒副产物生成规律影响

苏浩; 封莉; 张立秋

doi:10.13205/j.hjgc.202308005

城市污水中残留纳米颗粒对氯化消毒副产物生成规律影响

doi: 10.13205/j.hjgc.202308005

北京林业大学环境科学与工程学院, 北京 100083

详细信息

作者简介:
苏浩(1998-),男,硕士研究生,主要研究方向为水环境污染控制。408869486@qq.com

通讯作者:
张立秋(1972-),男,博士,教授,主要研究方向为新污染物去除与控制技术。zhangliqiu@bjfu.edu.cn

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出版历程
- 收稿日期: 2022-08-19
- 网络出版日期: 2023-11-15

INFLUENCE OF RESIDUAL NANOPARTICLES IN MUNICIPAL SEWAGE ON FORMATION OF CHLORINATION DISINFECTION BY-PRODUCTS

College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China

摘要

摘要: 为明确污水厂中频繁暴露的纳米颗粒(NPs)对消毒副产物(DBPs)生成规律的影响,以二级出水为底物,重点考察了氯消毒与UV/氯消毒过程中NPs存在浓度对DBPs生成的影响,并通过三维荧光光谱与紫外可见差分光谱分析NPs与二级出水中残留的有机物(EfOM)的络合情况。实验结果表明:3种NPs的存在降低了二级出水UV₂₅₄与SUVA含量,并通过疏水作用络合EfOM,造成Zeta电位、荧光强度、紫外吸光光度下降。当nTiO₂、nAg、NZVI 3种NPs的存在浓度均为500 μg/L时,在氯消毒过程中,三氯甲烷(TCM)、二氯已腈(DCAN)、一溴二氯甲烷(BDCM)生成量的减少量约是NPs存在浓度为10 μg/L时的2~5倍。在UV/氯消毒过程中,nAg的存在导致TCM、DCAN生成量分别上升了2.18,1.53 μg/L,对BDCM生成的影响不明显;nTiO₂的存在导致TCM、DCAN、BDCM生成量分别减少了4.09,2.02,2.15 μg/L;NZVI的存在导致TCM、DCAN、BDCM生成量分别减少了2.36,1.3,1.16 μg/L。实验通过研究污水厂残留NPs对DBPs生成机制的影响,为污水厂的安全运行提供数据支撑。
- 二级出水 /
- 消毒副产物 /
- 纳米颗粒 /
- 氯消毒 /
- UV/氯消毒
Abstract: In this study, in order to clarify the influence of frequent exposure of nanoparticles (NPs) in wastewater plants on disinfection by-products (DBPs) generation, the secondary effluent was used as the substrate to investigate the effect of NP_S concentration on DBPs generation in the chlorination disinfection and UV/chlorination disinfection process. Additionally, the complexation of NPs with residual organic matter (EfOM) in secondary effluent was analyzed by 3D-EEM and UV-vis differential spectra. The results showed that the content of UV₂₅₄ and SUVA in secondary effluent decreased by the presence of three NPs, and the Zeta potential, fluorescence intensity and UV absorbance were decreased by hydrophobic complexation of EfOM. When the concentration of NPs (nTiO₂, nAg, NZVI) was all 500 μg/L, In the process of chlorine disinfection, the reduction of chloroform (TCM), dichloroacetonitrile (DCAN) and bromodichloromethane (BDCM) was about 2 to 5 times that of NP_S at 10 μg/L. In the process of UV/chlorine disinfection, the generation of TCM and DCAN increased by 2.18 and 1.53 μg/L respectively in the presence of nAg, but the effect of nAg on the generation of BDCM was not obvious; the generation of TCM, DCAN and BDCM was reduced by 4.09,2.02,2.15 μg/L, respectively, in the presence of nTiO₂; The generation of TCM, DCAN and BDCM was reduced by 2.36,1.3,1.16 μg/L, respectively, in the presence of NZVI. This study investigates the impact of residual NPs from wastewater treatment plants on the mechanism of DBP formation, providing data support for the safe operation of such facilities.
- secondary effluent /
- disinfection by-products /
- nanoparticles /
- chlorination disinfection /
- UV/chlorination disinfection

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