Cargando…

Development and modeling of a novel type of photoreactors with exterior ultraviolet (UV) reflector for water treatment applications

Ultraviolet (UV) water disinfection method has emerged as an alternative to chemical methods of disinfection. In typical UV photoreactors for water treatment, water flows in the space between the lamp’s sleeve and outer shell. The contact of water and sleeve causes fouling, which reduces the effecti...

Descripción completa

Detalles Bibliográficos
Autores principales: Hassanpour, Amirhossein, Jalali, Alireza, Raisee, Mehrdad, Naghavi, Mohammad Reza
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10175273/
https://www.ncbi.nlm.nih.gov/pubmed/37169908
http://dx.doi.org/10.1038/s41598-023-34799-0
_version_ 1785040180982317056
author Hassanpour, Amirhossein
Jalali, Alireza
Raisee, Mehrdad
Naghavi, Mohammad Reza
author_facet Hassanpour, Amirhossein
Jalali, Alireza
Raisee, Mehrdad
Naghavi, Mohammad Reza
author_sort Hassanpour, Amirhossein
collection PubMed
description Ultraviolet (UV) water disinfection method has emerged as an alternative to chemical methods of disinfection. In typical UV photoreactors for water treatment, water flows in the space between the lamp’s sleeve and outer shell. The contact of water and sleeve causes fouling, which reduces the effectiveness of UV. To clean the photoreactor, the quartz sleeve must be replaced; this may lead to quartz or lamp breakage and mercury leakage into water during cleaning. In this study, a novel type of multi-lamp UV photoreactors is proposed, in which the UV lamps are placed out of the water channel and their UV irradiation is redirected into the channel using an outer cylindrical reflector. This allows for the installment of a self-cleaning mechanism for the water channel. A well-validated three-dimensional CFD model is utilized to model the performance of this photoreactor for microbial inactivation. The impacts of several geometrical and optical parameters are investigated on the inactivation of microorganisms. The results revealed that the difference in log reduction values (LRV) between fully specular and fully diffuse reflector ranges from 10 to 47% as the lamp-to-channel distance increases. For the volumetric flow rate of 25 GPM, the LRV of a photoreactor with fully diffuse reflector can be 46% higher than a fully specular one. In addition, the performance of the proposed photoreactor is compared against a classic L-shaped annular photoreactor. The results show that the new design can provide equal or better microbial performance compared to the classic photoreactor, but it removes many of their common issues such as quartz fouling, lamp overheating at low flow rates, and sleeve breakage during lamp replacement.
format Online
Article
Text
id pubmed-10175273
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-101752732023-05-13 Development and modeling of a novel type of photoreactors with exterior ultraviolet (UV) reflector for water treatment applications Hassanpour, Amirhossein Jalali, Alireza Raisee, Mehrdad Naghavi, Mohammad Reza Sci Rep Article Ultraviolet (UV) water disinfection method has emerged as an alternative to chemical methods of disinfection. In typical UV photoreactors for water treatment, water flows in the space between the lamp’s sleeve and outer shell. The contact of water and sleeve causes fouling, which reduces the effectiveness of UV. To clean the photoreactor, the quartz sleeve must be replaced; this may lead to quartz or lamp breakage and mercury leakage into water during cleaning. In this study, a novel type of multi-lamp UV photoreactors is proposed, in which the UV lamps are placed out of the water channel and their UV irradiation is redirected into the channel using an outer cylindrical reflector. This allows for the installment of a self-cleaning mechanism for the water channel. A well-validated three-dimensional CFD model is utilized to model the performance of this photoreactor for microbial inactivation. The impacts of several geometrical and optical parameters are investigated on the inactivation of microorganisms. The results revealed that the difference in log reduction values (LRV) between fully specular and fully diffuse reflector ranges from 10 to 47% as the lamp-to-channel distance increases. For the volumetric flow rate of 25 GPM, the LRV of a photoreactor with fully diffuse reflector can be 46% higher than a fully specular one. In addition, the performance of the proposed photoreactor is compared against a classic L-shaped annular photoreactor. The results show that the new design can provide equal or better microbial performance compared to the classic photoreactor, but it removes many of their common issues such as quartz fouling, lamp overheating at low flow rates, and sleeve breakage during lamp replacement. Nature Publishing Group UK 2023-05-11 /pmc/articles/PMC10175273/ /pubmed/37169908 http://dx.doi.org/10.1038/s41598-023-34799-0 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Hassanpour, Amirhossein
Jalali, Alireza
Raisee, Mehrdad
Naghavi, Mohammad Reza
Development and modeling of a novel type of photoreactors with exterior ultraviolet (UV) reflector for water treatment applications
title Development and modeling of a novel type of photoreactors with exterior ultraviolet (UV) reflector for water treatment applications
title_full Development and modeling of a novel type of photoreactors with exterior ultraviolet (UV) reflector for water treatment applications
title_fullStr Development and modeling of a novel type of photoreactors with exterior ultraviolet (UV) reflector for water treatment applications
title_full_unstemmed Development and modeling of a novel type of photoreactors with exterior ultraviolet (UV) reflector for water treatment applications
title_short Development and modeling of a novel type of photoreactors with exterior ultraviolet (UV) reflector for water treatment applications
title_sort development and modeling of a novel type of photoreactors with exterior ultraviolet (uv) reflector for water treatment applications
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10175273/
https://www.ncbi.nlm.nih.gov/pubmed/37169908
http://dx.doi.org/10.1038/s41598-023-34799-0
work_keys_str_mv AT hassanpouramirhossein developmentandmodelingofanoveltypeofphotoreactorswithexteriorultravioletuvreflectorforwatertreatmentapplications
AT jalalialireza developmentandmodelingofanoveltypeofphotoreactorswithexteriorultravioletuvreflectorforwatertreatmentapplications
AT raiseemehrdad developmentandmodelingofanoveltypeofphotoreactorswithexteriorultravioletuvreflectorforwatertreatmentapplications
AT naghavimohammadreza developmentandmodelingofanoveltypeofphotoreactorswithexteriorultravioletuvreflectorforwatertreatmentapplications