MECHANISMS AND EFFICIENCY OF REMOVAL OF ORGANIC MATTER AND ANTIBIOTIC RESISTANCE GENES IN SECONDARY EFFLUENT OF WATARPLANTS BY DIFFERENT PERSULFATE ACTIVATION METHODS

SUN Li-hua; MEI Xiao-yu; GAO Cheng; FENG Cui-min

doi:10.13205/j.hjgc.202209010

Volume 40 Issue 9

Nov. 2022

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SUN Li-hua, MEI Xiao-yu, GAO Cheng, FENG Cui-min. MECHANISMS AND EFFICIENCY OF REMOVAL OF ORGANIC MATTER AND ANTIBIOTIC RESISTANCE GENES IN SECONDARY EFFLUENT OF WATARPLANTS BY DIFFERENT PERSULFATE ACTIVATION METHODS[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 74-80,134. doi: 10.13205/j.hjgc.202209010

Citation:

SUN Li-hua, MEI Xiao-yu, GAO Cheng, FENG Cui-min. MECHANISMS AND EFFICIENCY OF REMOVAL OF ORGANIC MATTER AND ANTIBIOTIC RESISTANCE GENES IN SECONDARY EFFLUENT OF WATARPLANTS BY DIFFERENT PERSULFATE ACTIVATION METHODS[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 74-80,134. doi: 10.13205/j.hjgc.202209010

Citation:

SUN Li-hua, MEI Xiao-yu, GAO Cheng, FENG Cui-min. MECHANISMS AND EFFICIENCY OF REMOVAL OF ORGANIC MATTER AND ANTIBIOTIC RESISTANCE GENES IN SECONDARY EFFLUENT OF WATARPLANTS BY DIFFERENT PERSULFATE ACTIVATION METHODS[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 74-80,134. doi: 10.13205/j.hjgc.202209010

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MECHANISMS AND EFFICIENCY OF REMOVAL OF ORGANIC MATTER AND ANTIBIOTIC RESISTANCE GENES IN SECONDARY EFFLUENT OF WATARPLANTS BY DIFFERENT PERSULFATE ACTIVATION METHODS

doi: 10.13205/j.hjgc.202209010

1. Key Laboratory of Urban Rainwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2. School of Environmental and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
3. Beijing General Municipal Engineering Design & Research Institute Co., Ltd, Beijing 100082, China

Received Date: 2021-09-14
Available Online: 2022-11-09

Abstract

Abstract

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 SO₄^-· all participated in the reaction. Compared with PS alone and US/PS combined processes, the content of OH· and SO₄^-· generated was the highest in the pre-oxidation of nFe/PS, and the concentration of SO₄^-· 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.
- antibiotic resistance genes,
- persulfate,
- nano-iron,
- ultrasound,
- free radicals

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References(31)

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