Solar disinfection of natural river water with low microbiological content (10–103CFU/100ml) and evaluation of the thermal contribution to water purification

Vivar, Marta; Pichel, N.; Fuentes, M.

doi:10.1016/j.solener.2016.11.019

Cited by 20 publications

(11 citation statements)

References 16 publications

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“…This means that inactivation through the effect of temperature is more possible above this point (i.e. 45°C) which means that below 45°C, the effect of temperature on bacterial inactivation is negligible [ 37 , 38 ]. Thus, the removal of microorganisms through solar disinfection is severely limited in winter.…”

Section: Solar Water Disinfectionmentioning

confidence: 99%

“…It increases the cell wall permeability [ 39 ], limits the enzymatic activities [ 17 , 22 ], and also leads to protein denaturation which all of them are lethal to cells. In temperatures beyond 45°C, a synergy between thermal and optical inactivation is reported by many researchers [ 16 , 18 , 37 , 39 ] which improves the solar disinfection performance, but it is effective in specific cases under specific conditions.…”

Section: Solar Water Disinfectionmentioning

confidence: 99%

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Effectiveness of solar water disinfection in the era of COVID-19 (SARS-CoV-2) pandemic for contaminated water/wastewater treatment considering UV effect and temperature

Parsa

Momeni²,

Hemmat

et al. 2021

Journal of Water Process Engineering

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The COVID-19 pandemic disturbed the world from the beginning of 2020. The virus is highly contagious and spread rapidly and the number of infections increases exponentially. The high excessive number of patients and presence of the SARS-CoV-2 in human excreta and urine even after the infected person’s respiratory tests were negative, results in heavy load of viral in various water bodies. Numerous studies reported the presence of SARS-CoV-2 in wastewater samples. The risk of contaminating water bodies in the regions which suffer from the lack of proper sanitation system and wastewater treatment plants (mostly in developing countries) is higher. Since solar water disinfection (SODIS) is usually used by people in developing countries, there is a concern about using this method during the pandemic. Because the SARS-CoV-2 can be eliminated by high temperature (>56°C) and UVC wavelength (100-280 nm) while SODIS systems mainly work at lower temperature (<45°C) and use the available UVA (315-400 nm). Thus, during a situation like the ongoing pandemic using SODIS method for wastewater treatment (or providing drinking water) is not a reliable method. It should be reminded that the main aim of the present study is not just to give insights about the possibilities and risks of using SODIS during the ongoing pandemic but it has broader prospect for any future outbreak/pandemic that results in biological contamination of water bodies. Nevertheless, some experimental studies seem to be necessary by all researchers under conditions similar to developing countries.

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Section: Solar Water Disinfectionmentioning

confidence: 99%

Section: Solar Water Disinfectionmentioning

confidence: 99%

Effectiveness of solar water disinfection in the era of COVID-19 (SARS-CoV-2) pandemic for contaminated water/wastewater treatment considering UV effect and temperature

Parsa

Momeni²,

Hemmat

et al. 2021

Journal of Water Process Engineering

View full text Add to dashboard Cite

show abstract

“…Most fecal bacteria, for example, can survive between 20 and 45°C ( Marugán et al 2020 ). Bacteria's ability to inactivate increases as temperatures rise above 45°C., whereas temperatures below 45°C do not significantly affect this process ( McGuigan et al 1998 , Vivar et al 2017 ). This means that SODIS is only capable of removing microorganisms in winter to a very limited extent.…”

Section: Improves the Efficiency Of Wastewater Treatment By Reducing ...mentioning

confidence: 99%

Review of concerned SARS-CoV-2 variants like Alpha (B.1.1.7), Beta (B.1.351), Gamma (P.1), Delta (B.1.617.2), and Omicron (B.1.1.529), as well as novel methods for reducing and inactivating SARS-CoV-2 mutants in wastewater treatment facilities

Zahmatkesh

Rezakhani

Wang

2022

Journal of Hazardous Materials Advances

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“…A similar study conducted by Boyle et al showed a complete inactivation of Escherichia coli under strong sunny conditions. However, the study conducted by Vivar et al demonstrated incomplete disinfection of E. coli , Enterococcus spp., and total coliforms after 6 h of sun exposure.…”

Section: Introductionmentioning

confidence: 99%

“…However, little or no attention have been given to surface or river water samples, although the characteristics of water do influence the effectiveness of SODIS. Examples of the few available scientific studies using SODIS for surface water treatment include: Gutierrez‐Alfaro et al, Martin‐Dominguez et al, and Vivar et al Treatment with solar radiation alone does not result in complete disinfection of microorganisms, which still raises the question of the safety of water intended for drinking. This problem could be solved by exposing the water for a longer time, as recommend by Oates et al, but this leaves open the question of how long people can remain without potable water.…”

Section: Introductionmentioning

confidence: 99%

Coupling Extracts of Plant Coagulants With Solar Disinfection Showed a Complete Inactivation of Faecal Coliforms

Megersa

Beyene²,

Ambelu³

et al. 2018

CLEAN Soil Air Water

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The small treated volume of water in polyethylene terephthalate (PET) bottles used in solar water disinfection (SODIS), and incomplete inactivation of bacteria at high water turbidity of ≥30 nephelometric turbidity units (NTU) are the major drawbacks of solar water treatment techniques. To address these problems, field experiments are conducted to inactivate faecal coliforms under natural sunlight. To assess the efficacy of large volumes, 3, 5, and 10‐L transparent plastic containers are used along with standard PET bottles (2 L) as SODIS reactors. To reduce the turbidity of the water, extracts of natural coagulants from tubers of Maerua subcordata and seeds of Moringa stenopetala are used. The results revealed that the turbidity of water and volume of containers affect the efficiency of SODIS, where the highest bacterial inactivation is observed at 10 NTU and a 0.5‐L PET bottle. However, the combined water treatment experiments of coagulation with extracts of either M. subcordata or M. stenopetala followed by SODIS on turbid water (150 NTU) showed 100% reduction of faecal coliforms with 4 h of exposure. This research demonstrates that a 10‐L container filled with water can be treated combining plant extracts with SODIS. The technology can be used for provision of safe and adequate drinking water for rural communities in developing countries.

show abstract

Solar disinfection of natural river water with low microbiological content (10–103CFU/100ml) and evaluation of the thermal contribution to water purification

Cited by 20 publications

References 16 publications

Effectiveness of solar water disinfection in the era of COVID-19 (SARS-CoV-2) pandemic for contaminated water/wastewater treatment considering UV effect and temperature

Effectiveness of solar water disinfection in the era of COVID-19 (SARS-CoV-2) pandemic for contaminated water/wastewater treatment considering UV effect and temperature

Review of concerned SARS-CoV-2 variants like Alpha (B.1.1.7), Beta (B.1.351), Gamma (P.1), Delta (B.1.617.2), and Omicron (B.1.1.529), as well as novel methods for reducing and inactivating SARS-CoV-2 mutants in wastewater treatment facilities

Coupling Extracts of Plant Coagulants With Solar Disinfection Showed a Complete Inactivation of Faecal Coliforms

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