An evaluation of two tracers in surface-flow wetlands: Rhodamine-WT and lithium

Dierberg, Forrest E.; DeBusk, Thomas A.

doi:10.1672/0277-5212(2005)025[0008:aeotti]2.0.co;2

Cited by 56 publications

(55 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Some researchers claim that the poor tracer mass recovery and the non-conservative character of RWT does not adversely affect the quality of the tracer test results, especially if the method of moments is used for interpretation [6,8,17]. However, if the results interpretation is based on a simulation method that involves fitting the model curve directly to the tracer test results these discrepancies may be important.…”

Section: Discussionmentioning

confidence: 99%

“…However, the literature on RWT reactivity, and in particular susceptibility to sorption to sediments, is somewhat conflicting. Some studies [6] consider the RWT as a conservative tracer, whereas other studies [7,8] aimed at comparison of RWT and other conservative tracer such as LiCl and Br suitability in determination of hydraulic characteristics of constructed and natural wetlands, showed that RWT is less stable than LiCl and Br.…”

Section: Rhodamine Wtmentioning

confidence: 99%

See 1 more Smart Citation

Modification of Rhodamine WT tracer tests procedure in activated sludge reactors

Knap

Balbierz

2017

E3S Web Conf.

View full text Add to dashboard Cite

Abstract.One of the tracers recommended for use in wastewater treatment plants and natural waters is Rhodamine WT, which is a fluorescent dye, allowing to work at low concentrations, but may be susceptible to sorption to activated sludge flocs and chemical quenching of fluorescence by dissolved water constituents. Additionally raw sewage may contain other natural materials or pollutants exhibiting limited fluorescent properties, which are responsible for background fluorescence interference. This paper presents the proposed modifications to the Rhodamine WT tracer tests procedure in activated sludge reactors, which allow to reduce problems with background fluorescence and tracer loss over time, developed on the basis of conducted laboratory and field experiments.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Rhodamine Wtmentioning

confidence: 99%

Modification of Rhodamine WT tracer tests procedure in activated sludge reactors

Knap

Balbierz

2017

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…Sodium iodide exhibits better absorption characteristics. Of the fluorescent tracers, Rhodamine WT has been much praised, especially in terms of chemical stability (Vasudevan et al 2001, Dierberg andDeBusk 2005). In order to illustrate the use of a chemical tracer, Fig.…”

Section: Artificial Tracersmentioning

confidence: 99%

“…The flow discharge obtained using this method provides superior results to those obtained using NaCl (0.0133 m 3 ·s -1 ± 2.97%). Sabatini and Austin 1991, Panini et al 1999, Close et al 2002, Dierberg and DeBusk 2005, Tazioli and Tazioli 2005 has the advantages of being easily detectable by its strong fluorescence, having a large diffusivity, being chemically stable and having a non-aggressive character towards aquatic ecosystems.…”

Section: Fluoresceinmentioning

confidence: 99%

Experimental methods for river discharge measurements: comparison among tracers and current meter

Tazioli

2011

Hydrological Sciences Journal

View full text Add to dashboard Cite

“…No entanto, o ajuste dos modelos de escoamento e a obtenção dos parâmetros hidráulicos podem ser dificultados pelas condições ambientais locais e processos biológicos que ocorrem em SACs de escoamento subsuperficial. Portanto, na escolha dos traçadores a serem usados, fatores como toxicidade, reatividade, solubilidade e limite de detecção devem ser considerados (DIERBERG & DeBUSK, 2005).…”

Section: Introductionunclassified

Uso de traçadores para avaliação da hidrodinâmica de sistemas alagados construídos operando sob condições climáticas tropicais

Borges¹,

Matos²,

Calijuri

et al. 2009

Eng. Agríc.

View full text Add to dashboard Cite

RESUMO:Sistemas alagados construídos (SACs) são, atualmente, importante opção para o tratamento de resíduos e controle da poluição pontual e difusa. O uso de SACs tem aumentado ano a ano, entretanto o nível de entendimento da hidrodinâmica do processo não tem crescido na mesma proporção. Traçadores fluorescentes apresentam-se como opção na determinação de curvas de distribuição de tempos de residência (DTR) e de parâmetros hidrodinâmicos, como número de dispersão e eficiência hidráulica. A pesquisa foi realizada com o objetivo de avaliar dois corantes (rodamina WT e fluoresceína sódica) na determinação das características hidrodinâmicas de SACs com escoamento subsuperficial, operando em região de clima tropical. Os tempos de residência experimentais (τ R ) para os SACs variaram entre 4,5 e 5,0 dias, e os parâmetros de modelos teóricos foram obtidos para cada sistema, indicando dispersões muito pequenas. Os SACs, que apresentavam relação comprimento/largura (L/B) de 24/1, comportaram-se como sistemas de escoamento próximo ao pistonado. Embora a massa total adicionada não tenha sido recuperada (a adsorção é um dos mecanismos de perda), a pesquisa indicou que a rodamina WT pode ser utilizada com resultados satisfatórios na avaliação do comportamento hidrodinâmico de SACs. PALAVRAS-CHAVE:comportamento hidrodinâmico, distribuição de tempos de residência, fluoresceína sódica, número de dispersão, rodamina WT, wetlands construídas. FLUORESCENT DYES FOR HYDRODYNAMIC EVALUATION OF CONSTRUCTED WETLANDS UNDER TROPICAL CONDITIONSABSTRACT: Nowadays, constructed wetlands (CW) systems are an important wastewater treatment option. Subsurface flow (SSF) constructed wetlands are one of the main types which are being used, and in researches, these systems dyes tracer experiments are an appropriate tool to determine residence time distribution (RDT) curves and parameters of hydrodynamic models, as a wetland dispersion numbers and hydraulic efficiency. The objectives of this paper are to evaluate and compare the performance of two fluorescent tracers (rhodamine WT and sodium fluorescein) on subsurface-flow CWs hydrodynamic characteristics determination. The cells were operated at actual hydraulic residence time (τ R ) of a 4.5 d ~ 5.0 d range and the parameters of theoretical models were obtained for each system, indicating very low dispersion. The CWs with length/widths ratio equals to 24 presented as plug flow near systems. Although the recovery of total amount was small (high absorption is one of the loss mechanisms during these types of studies), rhodamine WT is a suitable tracer in mesocosms SSF constructed wetland systems of study.

show abstract

An evaluation of two tracers in surface-flow wetlands: Rhodamine-WT and lithium

Cited by 56 publications

References 22 publications

Modification of Rhodamine WT tracer tests procedure in activated sludge reactors

Modification of Rhodamine WT tracer tests procedure in activated sludge reactors

Experimental methods for river discharge measurements: comparison among tracers and current meter

Uso de traçadores para avaliação da hidrodinâmica de sistemas alagados construídos operando sob condições climáticas tropicais

Contact Info

Product

Resources

About