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  

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

作　　者：苏浩 封莉[1] 张立秋[1] SU Hao;FENG Li;ZHANG Liqiu(College of Environmental Science and Engineering,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学环境科学与工程学院,北京100083

出　　处：《环境工程》2023年第8期33-40,共8页Environmental Engineering

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nTiO_(2)、nAg、NZVI 3种NPs的存在浓度均为500μg/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10μg/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2.18,1.53μg/L,对BDCM生成的影响不明显;nTiO_(2)的存在导致TCM、DCAN、BDCM生成量分别减少了4.09,2.02,2.15μg/L;NZVI的存在导致TCM、DCAN、BDCM生成量分别减少了2.36,1.3,1.16μg/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。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 NPS 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(nTiO_(2),nAg,NZVI)was all 500μg/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 NPS at 10μg/L.In the process of UV/chlorine disinfection,the generation of TCM and DCAN increased by 2.18 and 1.53μg/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 4.09,2.02,2.15μg/L,respectively,in the presence of nTiO_(2);The generation of TCM,DCAN and BDCM was reduced by 2.36,1.3,1.16μg/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.

关 键 词：二级出水 消毒副产物 纳米颗粒 氯消毒 UV/氯消毒 

分 类 号：X703[环境科学与工程—环境工程]