Influence of design and operational parameters on the pathogens reduction in constructed wetland under the climate change scenario

López, Daniela; Leiva, Ana Marı́a; Arismendi, W. A.; Vidal, Gladys

doi:10.1007/s11157-019-09493-1

Cited by 18 publications

(14 citation statements)

References 120 publications

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“…Different reviews have shown that the removal of enteric bacteria occurs in different types of constructed wetlands at a high removal rate 75-99% (Vymazal 2005;López et al 2019), but the process is extremely slow with first order inactivation rate constants for E. coli 0.18 day −1 at 22.8 °C (Boutilier et al, 2009), for fecal coliforms 0.177 day −1 , for total coliforms 0.620 day −1 , and for Clostridium 0.102 day −1 (Vymazal 2005). Solar disinfection is usually insignificant in The microbicidal action depends on the radiation intensity and the dose applied.…”

Section: Extrapolation Of Results From the Photolytic Reactor To The Maturation Lagoonmentioning

confidence: 99%

“…Furthermore, disinfection is required in some areas to fulfil certain directives, such as the Habitats Directive (92/43/EEC) and Bathing Water Directive (2006/7/EC). The level of disinfection of microorganism is insufficient in constructed wetlands (López et al 2019 ), which is why some authors propose the use of UV photolytic reactors (Azaizeh et al 2013 ; González et al 2019 ) and others the use of maturation lagoons (Tanner et al 2005 ; Russo et al 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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Study of coliforms and Clostridium bacteria inactivation in wastewaters by a pilot photolysis process and by the maturation lagoons of a low-cost nature-based WWTP

García-Prieto

Núñez-Núñez

Proal-Nájera

et al. 2022

Environ Sci Pollut Res

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The inactivation processes of coliform bacteria (total and fecal) and sulphito-reducing Clostridium bacteria (vegetative species and spores) in water maturation lagoon of a low-cost nature-based wastewater treatment plant using constructed wetlands and through processes of photolysis in a pilot photoreactor have been comparatively studied. The different inactivation mechanisms by photolysis of these bacteria have been studied following the criteria of different statistical and kinetic models. Clostridium disinfection treatments fit models in which two types of bacteria populations coexist, one sensitive (vegetative species) and the other (spores) resistant to the treatment, the sensitive one (94%) with an inactivation rate of k = 0.24 ± 0.07 min−1 and the resistant one (6%) with k = 0.11 ± 0.05 min−1. Total coliform photolytic disinfection also shows two populations with different physiological state. The time required to reduce the first logarithmic decimal cycle of the different types of bacteria (physiological states) are δ1 = 4.2 ± 0.9 and δ2 = 8.3 ± 1.1 min, respectively. For fecal coliform photolytic disinfection, only bacteria population, with k = 1.15 ± 0.19 min−1, is found. The results obtained confirm the photolytic disinfection processes and maturation lagoon are effective systems for Clostridia bacteria removal after water treatment by nature-based systems. Total removal of coliform bacteria is not achieved by maturation lagoons, but their reduction is significant using low doses of cumulative radiation.

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Section: Extrapolation Of Results From the Photolytic Reactor To The Maturation Lagoonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of coliforms and Clostridium bacteria inactivation in wastewaters by a pilot photolysis process and by the maturation lagoons of a low-cost nature-based WWTP

García-Prieto

Núñez-Núñez

Proal-Nájera

et al. 2022

Environ Sci Pollut Res

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“…The antibiosis mechanism is related to the production of low molecular weight antibiotics by a group of bacteria or fungi. They can inhibit the growth of ARB in CWs and therefore decrease ARG abundance [41]. Similarly, it has been reported that plant roots are capable of releasing antibiotic compounds.…”

Section: Mechanisms Of Antibiotic-resistant Gene Reduction In Constru...mentioning

confidence: 93%

Antibiotic-Resistant Gene Behavior in Constructed Wetlands Treating Sewage: A Critical Review

et al. 2022

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The main objective of this review is to evaluate the performance of constructed wetlands (CWs) used to reduce antibiotic-resistant genes (ARGs) during sewage treatment. To accomplish this objective, statistical and correlation analyses were performed using published data to determine the influence of operational and design parameters on ARG reduction in CWs. The effects of design and operational parameters, such as different CW configurations, seasonality, monoculture and polyculture, support medium, and hydraulic retention time (HRT), on ARG removals, were analyzed. A comparison of ARG reduction under different CW configurations showed that the hybrid configuration of surface flow (SF)–vertical subsurface flow (VSSF) achieved the highest reductions, with values of 1.55 ulog. In this case, aeration is considered an important factor to reduce ARGs in CWs, and it should be considered in future studies. However, statistical analyses showed that the ARG reductions under different CW configurations were not significant (p > 0.05). The same behavior was observed when the effects of operational factors on ARG reductions were analyzed (p > 0.05). The results of this study show that CWs are not optimal technologies to reduce ARGs in sewage. The combination of CWs with advanced wastewater technologies can be a solution for enhancing ARG reduction and reducing the spread of antibiotic resistance.

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“…Sin embargo, este medio presenta una Tabla 1. Contaminantes importantes de interés en el tratamiento de las aguas residuales [12] Contaminantes Importancia…”

Section: B Componentes De Un Humedal Artificial De Flujo Subsuperficialunclassified

Humedales artificiales subsuperficiales: comparación de metodologías de diseño para el cálculo del area superficial basado en la remoción de la materia organica

Loaiza

2022

Ing.USBMed

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Los humedales artificiales vislumbran una buena alternativa en el campo de las aguas residuales, siendo soluciones integrales, con altas eficiencias y bajos costos de remoción. De esta manera se recopilan selectivamente 4 metodologías propuestas por diferentes autores para estimar el área superficial de humedales subsuperficiales tanto horizontales como verticales y así comparar los parámetros de diseño utilizados por cada autor o referencia. Se concluye que tanto Kadlec como Reed – RAS 2017 son las referencias más recomendadas para el diseño de humedales artificiales debido a la similitud de resultados y aplicabilidad en casos prácticos, además porque emplean variables tales como las constantes biocinéticas de primer orden, la porosidad del medio granular o soporte del material vegetal, concentración de fondo, el caudal de entrada al sistema y las concentraciones de entrada y salida en términos de DBO5, dichas variables son importantes desde el punto de vista hidráulico y de costos de constructivos, ya que estas influyen en la viabilidad económica de los humedales artificiales para la implementación de estos como alternativa de tratamiento de las aguas residuales.

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Influence of design and operational parameters on the pathogens reduction in constructed wetland under the climate change scenario

Cited by 18 publications

References 120 publications

Study of coliforms and Clostridium bacteria inactivation in wastewaters by a pilot photolysis process and by the maturation lagoons of a low-cost nature-based WWTP

Study of coliforms and Clostridium bacteria inactivation in wastewaters by a pilot photolysis process and by the maturation lagoons of a low-cost nature-based WWTP

Antibiotic-Resistant Gene Behavior in Constructed Wetlands Treating Sewage: A Critical Review

Humedales artificiales subsuperficiales: comparación de metodologías de diseño para el cálculo del area superficial basado en la remoción de la materia organica

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