Enhancement of sunlight irradiation for wastewater disinfection by mixing with seawater

There is a need for developing a simple and easy-to-maintain disinfection technique for sewage treatment for use in developing countries and disaster-affected areas. We propose a novel disinfection technology that inactivates bacteria in wastewater via sunlight irradiation under high salt concentrat...

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Autores principales:	Yoshihiro Suzuki, Mizuho Uno, Masateru Nishiyama, Kei Nukazawa, Yoshifumi Masago
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	disinfection tank enterococci escherichia coli inactivation irradiation energy salinity Public aspects of medicine RA1-1270
Acceso en línea:	https://doaj.org/article/8aea3577a090473dbc5ace96e0768118
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spelling	oai:doaj.org-article:8aea3577a090473dbc5ace96e07681182021-11-06T06:31:02ZEnhancement of sunlight irradiation for wastewater disinfection by mixing with seawater1477-89201996-782910.2166/wh.2021.153https://doaj.org/article/8aea3577a090473dbc5ace96e07681182021-10-01T00:00:00Zhttp://jwh.iwaponline.com/content/19/5/836https://doaj.org/toc/1477-8920https://doaj.org/toc/1996-7829There is a need for developing a simple and easy-to-maintain disinfection technique for sewage treatment for use in developing countries and disaster-affected areas. We propose a novel disinfection technology that inactivates bacteria in wastewater via sunlight irradiation under high salt concentration by mixing with seawater. The disinfection efficiency of the proposed method was quantitatively evaluated and examined using fecal indicator bacteria. When the salinity in wastewater was adjusted to 30 practical salinity units by mixing with seawater, the constant of inactivation irradiation energy Ks (m2/MJ) was 1.6–2.2-fold greater than that without seawater for total coliforms and Escherichia coli. By contrast, although enterococci were inactivated by sunlight irradiation, an increase in salinity did not enhance disinfection. On setting the irradiation energy of sunlight to 5.5 MJ/m2, >99% of the fecal indicator bacteria were inactivated. Finally, we examined the relationship between the attenuation of irradiance and water depth and accordingly proposed a design of a treatment system wherein wastewater and seawater were adequately mixed and passed via a disinfection tank under the natural flow with sunlight irradiation. HIGHLIGHTS Quantitative evaluation of the appropriate salinity in wastewater mixed with seawater.; Inactivation of fecal indicator bacteria by sunlight with seawater mixing.; Disinfection process based on irradiance and the water depth.; Proposed disinfection is extremely simple and environmentally friendly.;Yoshihiro SuzukiMizuho UnoMasateru NishiyamaKei NukazawaYoshifumi MasagoIWA Publishingarticledisinfection tankenterococciescherichia coliinactivation irradiation energysalinityPublic aspects of medicineRA1-1270ENJournal of Water and Health, Vol 19, Iss 5, Pp 836-845 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	disinfection tank enterococci escherichia coli inactivation irradiation energy salinity Public aspects of medicine RA1-1270
spellingShingle	disinfection tank enterococci escherichia coli inactivation irradiation energy salinity Public aspects of medicine RA1-1270 Yoshihiro Suzuki Mizuho Uno Masateru Nishiyama Kei Nukazawa Yoshifumi Masago Enhancement of sunlight irradiation for wastewater disinfection by mixing with seawater
description	There is a need for developing a simple and easy-to-maintain disinfection technique for sewage treatment for use in developing countries and disaster-affected areas. We propose a novel disinfection technology that inactivates bacteria in wastewater via sunlight irradiation under high salt concentration by mixing with seawater. The disinfection efficiency of the proposed method was quantitatively evaluated and examined using fecal indicator bacteria. When the salinity in wastewater was adjusted to 30 practical salinity units by mixing with seawater, the constant of inactivation irradiation energy Ks (m2/MJ) was 1.6–2.2-fold greater than that without seawater for total coliforms and Escherichia coli. By contrast, although enterococci were inactivated by sunlight irradiation, an increase in salinity did not enhance disinfection. On setting the irradiation energy of sunlight to 5.5 MJ/m2, >99% of the fecal indicator bacteria were inactivated. Finally, we examined the relationship between the attenuation of irradiance and water depth and accordingly proposed a design of a treatment system wherein wastewater and seawater were adequately mixed and passed via a disinfection tank under the natural flow with sunlight irradiation. HIGHLIGHTS Quantitative evaluation of the appropriate salinity in wastewater mixed with seawater.; Inactivation of fecal indicator bacteria by sunlight with seawater mixing.; Disinfection process based on irradiance and the water depth.; Proposed disinfection is extremely simple and environmentally friendly.;
format	article
author	Yoshihiro Suzuki Mizuho Uno Masateru Nishiyama Kei Nukazawa Yoshifumi Masago
author_facet	Yoshihiro Suzuki Mizuho Uno Masateru Nishiyama Kei Nukazawa Yoshifumi Masago
author_sort	Yoshihiro Suzuki
title	Enhancement of sunlight irradiation for wastewater disinfection by mixing with seawater
title_short	Enhancement of sunlight irradiation for wastewater disinfection by mixing with seawater
title_full	Enhancement of sunlight irradiation for wastewater disinfection by mixing with seawater
title_fullStr	Enhancement of sunlight irradiation for wastewater disinfection by mixing with seawater
title_full_unstemmed	Enhancement of sunlight irradiation for wastewater disinfection by mixing with seawater
title_sort	enhancement of sunlight irradiation for wastewater disinfection by mixing with seawater
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/8aea3577a090473dbc5ace96e0768118
work_keys_str_mv	AT yoshihirosuzuki enhancementofsunlightirradiationforwastewaterdisinfectionbymixingwithseawater AT mizuhouno enhancementofsunlightirradiationforwastewaterdisinfectionbymixingwithseawater AT masaterunishiyama enhancementofsunlightirradiationforwastewaterdisinfectionbymixingwithseawater AT keinukazawa enhancementofsunlightirradiationforwastewaterdisinfectionbymixingwithseawater AT yoshifumimasago enhancementofsunlightirradiationforwastewaterdisinfectionbymixingwithseawater
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Enhancement of sunlight irradiation for wastewater disinfection by mixing with seawater

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