Removal of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration

Antibiotic resistance genes (ARGs), as a new type of environmental pollutant that threaten human health, have been detected in the effluent of sewage treatment systems. In this study, the removal from water of ARGs, 16S rRNA, class 1 integron (intI1), and dissolved organic carbon (DOC) were investig...

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Autores principales:	Lihua Sun, Hao Tong, Cheng Gao, Yehui Liu, Cuimin Feng
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	antibiotic resistance genes nano-iron persulfate ultrafiltration ultrasound Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/0e6c5239a10b4b69b802cc4d02ba8c26
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spelling	oai:doaj.org-article:0e6c5239a10b4b69b802cc4d02ba8c262021-11-06T10:54:09ZRemoval of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration0273-12231996-973210.2166/wst.2021.088https://doaj.org/article/0e6c5239a10b4b69b802cc4d02ba8c262021-04-01T00:00:00Zhttp://wst.iwaponline.com/content/83/7/1578https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Antibiotic resistance genes (ARGs), as a new type of environmental pollutant that threaten human health, have been detected in the effluent of sewage treatment systems. In this study, the removal from water of ARGs, 16S rRNA, class 1 integron (intI1), and dissolved organic carbon (DOC) were investigated using processes combining nano-iron (nFe), ultrasound (US), activated persulfate (PS) and ultrafiltration (UF). The oxidation mechanism was also studied. The results showed that both nFe and US activation could improve the oxidative effect of PS, and the effect of nFe was better than that of US. Compared with PS-UF, nFe/PS-UF and US/PS-UF significantly enhanced the removal of various ARGs and DOC. nFe/PS-UF was the most effective treatment, reducing cell-associated and cell-free ARGs by 1.74–3.14-log and 1.00–2.61-log, respectively, while removing 30% of DOC. Pre-oxidation methods using PS, nFe/PS, and US/PS significantly enhanced the efficacy of UF for removing DOC with molecular weights above 50 kDa and below 10 kDa, but the removal of DOC between 10 and 50 kDa decreased. The free radicals SO4·− and ·OH were shown to participate in the process of ARGs oxidation. HIGHLIGHTS Persulfate oxidation pretreatment significantly improved the removal effect of ultrafiltration on ARGs due to release of SO4·−.; Nano-iron forms a loose and porous oxide shell on the surface of the particles, which can adsorb ARGs.; Cavitation during ultrasound treatment can lyse the cell structure, transforming cell-associated ARGs into the free state;Lihua SunHao TongCheng GaoYehui LiuCuimin FengIWA Publishingarticleantibiotic resistance genesnano-ironpersulfateultrafiltrationultrasoundEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 7, Pp 1578-1590 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	antibiotic resistance genes nano-iron persulfate ultrafiltration ultrasound Environmental technology. Sanitary engineering TD1-1066
spellingShingle	antibiotic resistance genes nano-iron persulfate ultrafiltration ultrasound Environmental technology. Sanitary engineering TD1-1066 Lihua Sun Hao Tong Cheng Gao Yehui Liu Cuimin Feng Removal of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration
description	Antibiotic resistance genes (ARGs), as a new type of environmental pollutant that threaten human health, have been detected in the effluent of sewage treatment systems. In this study, the removal from water of ARGs, 16S rRNA, class 1 integron (intI1), and dissolved organic carbon (DOC) were investigated using processes combining nano-iron (nFe), ultrasound (US), activated persulfate (PS) and ultrafiltration (UF). The oxidation mechanism was also studied. The results showed that both nFe and US activation could improve the oxidative effect of PS, and the effect of nFe was better than that of US. Compared with PS-UF, nFe/PS-UF and US/PS-UF significantly enhanced the removal of various ARGs and DOC. nFe/PS-UF was the most effective treatment, reducing cell-associated and cell-free ARGs by 1.74–3.14-log and 1.00–2.61-log, respectively, while removing 30% of DOC. Pre-oxidation methods using PS, nFe/PS, and US/PS significantly enhanced the efficacy of UF for removing DOC with molecular weights above 50 kDa and below 10 kDa, but the removal of DOC between 10 and 50 kDa decreased. The free radicals SO4·− and ·OH were shown to participate in the process of ARGs oxidation. HIGHLIGHTS Persulfate oxidation pretreatment significantly improved the removal effect of ultrafiltration on ARGs due to release of SO4·−.; Nano-iron forms a loose and porous oxide shell on the surface of the particles, which can adsorb ARGs.; Cavitation during ultrasound treatment can lyse the cell structure, transforming cell-associated ARGs into the free state;
format	article
author	Lihua Sun Hao Tong Cheng Gao Yehui Liu Cuimin Feng
author_facet	Lihua Sun Hao Tong Cheng Gao Yehui Liu Cuimin Feng
author_sort	Lihua Sun
title	Removal of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration
title_short	Removal of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration
title_full	Removal of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration
title_fullStr	Removal of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration
title_full_unstemmed	Removal of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration
title_sort	removal of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/0e6c5239a10b4b69b802cc4d02ba8c26
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Removal of antibiotic resistance genes from secondary effluent by processes combining nano-iron, ultrasound-activated persulfate, and ultrafiltration

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