摘要
分别采用纳米零价铁(nZVI)和超声(US)技术对过硫酸盐(PS)进行活化,探究PS、nZVI/PS和US/PS 3种预氧化工艺对城市污水厂二级出水中不同类型抗生素抗性基因(antibiotic resistance genes,ARGs)和溶解性有机物(dissolved organic matter,DOC)的去除效能与机制。结果表明:最佳PS和nZVI投加量为4,2 mmol/L,US最佳功率为40 kHz,经过PS、nZVI/PS和US/PS预氧化反应后,二级出水中ARGs(tetA、tetC、sulⅠ、sulⅡ),intⅠ1及16S rRNA的浓度分别为10^(4.38)~10^(6.82),10^(4.02)~10^(5.97),10^(4.02)~10^(6.98)copies/mL;在最佳反应条件下DOC去除率分别为11.2%、17.2%和15.3%;其中,nZVI/PS对ARGs和DOC的去除效果最好。3种预氧化过程中均有OH·和SO^(-)_(4)·参与反应,相较于PS和US/PS,nZVI/PS预氧化过程中产生的SO^(-)_(4)·和OH·含量最多,且SO^(-)_(4)·在反应体系中的浓度最高。因此,nZVI/PS预氧化方式可作为后续处理二级出水中ARGs和DOC的有效去除方法。
This paper used iron nanoparticles(nFe)and ultrasound(US)to activate persulfate(PS),then explored the removal efficiencies of PS,nFe/PS and US/PS in pre-oxidation processes on antibiotic resistance genes(ARGs)and dissolved organic matter(DOC)in secondary effluent,and discussed their removal mechanisms.The results showed that the optimal dosages of PS,nFe and US were determined to be 4 mmol/L,2 mmol/L and 40 kHz,respectively.After PS,nFe/PS and US/PS pre-oxidation reactions,concentrations of ARGs(tetA,tetC,sulⅠ,sulⅡ),intⅠ1 and 16 S rRNA were 10^(4.38)~10^(6.82),10^(4.02)~10^(5.97)and 10^(4.02)~10^(6.98),respectively.Under the optimal reaction conditions,the removal rates of DOC were 11.2%,17.2%and 15.3%,respectively.Among them,nFe/PS had the best removal effect on the above-mentioned ARGs and DOC.In the three pre-oxidation processes,OH·and SO^(-)_(4)·all participated in the reaction.Compared with PS alone and US/PS combined processes,the content of OH·and SO^(-)_(4)·generated was the highest in the pre-oxidation of nFe/PS,and the concentration of SO^(-)_(4)·was the highest in the reaction system.Therefore,the nFe/PS pre-oxidation method could be used as a subsequent treatment to effectively remove ARGs and DOC in the secondary effluent.
作者
孙丽华
梅筱禹
高呈
冯萃敏
SUN Lihua;MEI Xiaoyu;GAO Cheng;FENG Cuimin(Key Laboratory of Urban Rainwater System and Water Environment,Ministry of Education,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;School of Environmental and Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing General Municipal Engineering Design&Research Institute Co.,Ltd,Beijing 100082,China)
出处
《环境工程》
CAS
CSCD
北大核心
2022年第9期74-80,134,共8页
Environmental Engineering
基金
国家自然科学基金(52070011)
北京建筑大学市属高校基本科研业务费项目(X18025)
