Desinfecção de água de chuva por radiação ultravioleta

Wisbeck, Elisabeth; Sandri, Edgar K; Soares, Andrea L M; Medeiros, Sandra Helena Westrupp

doi:10.1590/s1413-41522011000400004

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…Ultraviolet band C (UVC -254 nm) is used as germicide. However, in sublethal doses, microorganisms can recover their metabolic activity, in addition to requiring a physical barrier to protect the operator due to its carcinogenic potential (Wisbeck et al, 2011;Di-Bernardo et al, 2017;Mbonimpa et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Using light emitting diodes at 450 nm for in vitro treatment of water intended for human consumption

Felipe¹,

Juciene²,

Ana³

et al. 2018

Afr. J. Microbiol. Res.

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This study aimed to evaluate the in vitro antimicrobial effect of exposing raw water intended for human consumption to light (λ= 450 nm) and to investigate the correlation between the results obtained and physical and chemical parameters. Fifteen (15) samples of raw water were collected from households in a rural area of Santo Antônio de Jesus -Bahia (Brazil), from November to December 2016. A 100 mL aliquot of each sample was exposed to a lighting system consisting of two high intensity light emitting diodes, with a wavelength of 450 nm and luminous flux of 200 lumens per 10 h. Quantifications of heterotrophic bacteria, total coliforms and temperature started at time zero and were done every two hours until the end of exposure to light. Bacteriological analysis was repeated after 72 h of being exposed to light. pH, dissolved oxygen and salinity analyses were performed before each experiment. After a 10h illumination at 450 nm light emitting diodes (LEDs), the dosage of light received by the water samples was 581.8 J/cm 2 . There was a significant reduction in the two bacteriological parameters analyzed after treatment (p = 0.000). There was an average decrease in heterotrophic bacteria counts from 3.44 to 1.86 log CFU/mL and total coliforms from 2.45 to 1.02 log CFU/mL. Mean reductions of heterotrophic bacteria were 97.01% and total coliforms were 95.61%. After 72 h, both counts increased; there was significant growth between heterotrophic bacteria (p = 0.000), but there was no significant growth for total coliforms (p = 0.058). pH (p = -0.981, p = 0.000), dissolved oxygen (ρ = -0.529, p = 0.043) and temperature (ρ = 0.521, p = 0.047) were related to the percentage reduction of heterotrophic bacteria. The method is shown to be effective in disinfecting raw water in vitro under different physical and chemical conditions.

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Section: Introductionmentioning

confidence: 99%

Using light emitting diodes at 450 nm for in vitro treatment of water intended for human consumption

Felipe¹,

Juciene²,

Ana³

et al. 2018

Afr. J. Microbiol. Res.

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“…This observation is of great relevance and validates the effectiveness of the reactor used due the possibility of enzymatic photoreactivation. Wisbeck et al (2011), evaluated the treatment of rainwater by ultraviolet radiation, analyzing total coliforms, tolerant coliforms and heterotrophic bacteria before, after and then after being translated and stored for 24, 48 and 72 hours. With a 30 W lamp and a flow rate of 0.04 s -1 , it achieved 100% effectiveness in the inactivation of total and fecal coliforms for up to 72 hours, unlike the heterotrophic bacteria that identified in the 3 storage times after treatment.…”

Section: Resultsmentioning

confidence: 99%

Comparative analysis between the chlorination and ultraviolet radiation methods for the disinfection of bacteria-contaminated water

Ritt¹,

Fernandes²,

Júnior³

2021

Rev. ambiente água

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The quality of water for human consumption has been a concern for large organizations and researchers, since the disinfection process, a step of great importance in water treatment plants, has not achieved its proper purpose. There have been frequent reports of the ineffectiveness of bacteria inactivation by the use of chlorine, which is the most used in Brazil, and also due to the formation of by-products such as trihalomethanes and haloacetic acids that are considered toxic to human health. The method of disinfection by ultraviolet radiation (UV) has been widely explored, due to its effectiveness in inactivating a wide variety of pathogens, in addition to the absence of by-product formation. The combined chlorine+UV process as chemical and physical disinfectants, respectively, is complementary and essential when looking for the safety of water for human consumption. The objective of this research was to statistically analyze the performance of disinfectants, chlorine and UV radiation, both separately and together, by inactivating the bacteria Escherichia coli and Pseudomonas aeruginosa and then incubating for 48 hours after having received the treatments. The statistical method showed that chlorine and UV obtained the same significance of 100% bacteria inactivation, and that within the determined time of 48 hours after the treatments the bacteria did not show reactivation. Thus, the study affirmed the usefulness of applying UV radiation as a complement to systems that use chlorine, with a special focus on residential water systems and supply.

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“…El agua lluvia puede convertirse en una fuente de agua no convencional, debido a que no existe una vinculación directa con otro tipo de suministro de agua potable. A pesar de ello, el agua lluvia puede considerarse de buena calidad, siempre y cuando se tengan los cuidados necesarios durante su captación y almacenamiento [9].…”

Section: Introductionunclassified

Tratamiento de agua lluvia con fines de consumo humano

Avilés

Chaparro

2020

Cien.Ing.Neogranadina

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El agua lluvia es un recurso natural renovable que posee bajos índices de contaminación. En zonas rurales, el acceso al agua potable puede convertirse en una actividad poco factible. Por esta razón, la implementación de un sistema autosostenible donde el agua lluvia pueda ser tratada surge como una alternativa para evitar problemas relacionados con el estrés hídrico y la salud pública. Con base en lo anterior, el objetivo de esta investigación consistió en determinar los tratamientos necesarios para que el agua lluvia sea apta para diferentes fines de reutilización, entre estos el consumo humano. Los resultados sugieren que el filtro de carbón natural y la desinfección solar son las alternativas que presentan una mayor remoción de los contaminantes evaluados.

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Desinfecção de água de chuva por radiação ultravioleta

Cited by 6 publications

References 6 publications

Using light emitting diodes at 450 nm for in vitro treatment of water intended for human consumption

Using light emitting diodes at 450 nm for in vitro treatment of water intended for human consumption

Comparative analysis between the chlorination and ultraviolet radiation methods for the disinfection of bacteria-contaminated water

Tratamiento de agua lluvia con fines de consumo humano

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