Hydrodynamics of vertical subsurface flow constructed wetlands: Tracer tests with rhodamine WT and numerical modelling

Giraldi, David; Vitturi, Mattia de’Michieli; Zaramella, Mattia; Marion, Andrea; Iannelli, Renato

doi:10.1016/j.ecoleng.2008.06.004

Cited by 56 publications

(36 citation statements)

References 26 publications

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“…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%

Modification of Rhodamine WT tracer tests procedure in activated sludge reactors

Knap

Balbierz

2017

E3S Web Conf.

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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.

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Section: Discussionmentioning

confidence: 99%

Modification of Rhodamine WT tracer tests procedure in activated sludge reactors

Knap

Balbierz

2017

E3S Web Conf.

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“…According to these criteria, six models are selected for review: PHWAT (Brovelli et al 2007(Brovelli et al , 2009a, FITOVERT (Giraldi et al 2009(Giraldi et al , 2010, HYDRUS-2D-CW2D (Langergraber and Š imůnek 2005), HYDRUS-2D-CWM1 (Langergraber and Š imůnek 2012), CWM1-RETRASO (Llorens et al 2011a, b), BIO_PORE (Samsó and García 2013a, b) and AQUASIM-CWM1 (Mburu et al 2012). …”

Section: Model Selectionmentioning

confidence: 99%

“…Indeed, a general search for the words "constructed wetland model" on common databases of scientific papers brings a limitless number of publications on this topic. Among them, a very general distinction can be made: those focusing on simulation of the hydraulics (Dittmer et al 2005;Fan et al 2008;Galvão et al 2010;Korkusuz et al 2007;Kotti et al 2013), the hydrodynamics and clogging (or any of them individually) Giraldi et al 2009Giraldi et al , 2010Hua et al 2013;Knowles and Davies 2011;Suliman et al 2006) and those focusing on the removal of a specific pollutant or a set of pollutants (which generally also include hydraulic and hydrodynamic models of diverse complexity). Among the latter, the most commonly targeted pollutants are organic compounds (Akratos et al 2008;Henrichs et al 2007;Liolios et al 2012;Toscano et al 2009), nitrogen (Akratos et al 2009;Henrichs et al 2009;Mayo and Bigambo 2005;McBride and Tanner 2000;Meyer et al 2006Meyer et al , 2011Morvannou et al 2013;Moutsopoulos et al 2011;Toscano et al 2009), sulphur (Lloyd et al 2004), phosphorous (Hafner and Jewell 2006), heavy metals and mine drainage (Goulet 2001;Lee and Scholz 2006;Mitsch and Wise 1998), arsenic , pesticides (Krone-Davis et al 2013) and emerging pollutants (Hijosa-Valsero et al 2011).…”

Section: Model Selectionmentioning

confidence: 99%

See 1 more Smart Citation

Subsurface Flow Constructed Wetland Models: Review and Prospects

Samsó

Meyer²,

García

2014

The Role of Natural and Constructed Wetlands in Nutrient Cycling and Retention on the Landscape

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Numerical models are recognized nowadays as a powerful tool to increase the understanding of the internals of constructed wetlands and to help improve their design. Over the last decade many models have been developed, and many simulation studies have been published. Despite diversity is generally a positive thing, having so many different models can be confusing for potential users and may also hinder further development of the existing ones. The aim of this paper is to summarize the state of the art of this discipline, focussing the attention on the most feature-rich process-based models for constructed wetlands for urban wastewater treatment. Their description is combined with a feature comparison in a tabular format to facilitate the selection of one or another based on the specific needs of the potential user. Moreover, a discussion is made regarding the advantages of each reviewed model regarding features, licencing and expected evolution of each of them. Later in the document, we describe the essential phenomena, parameters and processes that we believe that future generation of constructed wetlands models should incorporate, to guide further research on this discipline. Although this paper is focused on models used in academic circles, a model developed to optimize the design of combined sewer overflow wetlands is presented as an example of the potential of design-focused wetlands. At the end of the paper we provide an overview of the past, present and future of constructed wetlands models and analyse were we stand and which is the way to go and the main goals in the near future.

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“…5). It has been shown that the hydraulic conductivity in wetlands increases with increased particle size, decreases as uniformity of particle size increases, and is more uniform in saturated sands [32][33]. Difference in particle size was discounted as the primary basis for the disparities in SHC because, apart from the fact that each sand batch was highly similar, group EF sand particles were slightly smaller than group BCD [2% more clay, 2.2% more fine sand, 2.6% less medium sand and 2.8% less coarse sand, but the SHC of group BCD was lower than that of group EF.…”

Section: Hydraulic Propertiesmentioning

confidence: 99%

Minor differences in sand physicochemistry lead to major differences in bacterial community structure and function after exposure to synthetic acid mine drainage

Welz

Ramond

Cowan

et al. 2014

Biotechnol Bioproc E

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The formation of environmentally toxic acidic waste from mining activities is a world-wide problem. Neutralization of this waste can be accomplished by physicochemical and/or biological means. In this short-term study, synthetic acid mine drainage was added to sandfilled mesocosms containing silica-dominated (quartz) sand. Glucose was added as a carbon source for microbial iron and/or sulphate reduction. Replicates contained two separate batches of sand obtained from the same quarry site. The investigations used to assess and compare the chemical and biological functioning of the replicates included system hydraulic conductivity measurements, sand chemistry, effluent chemistry and bacterial community fingerprinting. Minor differences in composition of the sand, including the levels of available nutrients and micronutrients, resulted in major differences in measured parameters. 2 Significant differences in effluent chemistry were found in systems containing different batches of sand. It was demonstrated that the characteristics of the sand and the presence of acid mine drainage impacted the bacterial community structure and function. The importance of the physical substrate on the selection of functional microbial communities in systems remediating AMD should not be under-estimated. The physical substrate should be carefully selected and it may be prudent to include small-scale comparative studies in each particular setting prior to full-scale implementation.

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Hydrodynamics of vertical subsurface flow constructed wetlands: Tracer tests with rhodamine WT and numerical modelling

Cited by 56 publications

References 26 publications

Modification of Rhodamine WT tracer tests procedure in activated sludge reactors

Modification of Rhodamine WT tracer tests procedure in activated sludge reactors

Subsurface Flow Constructed Wetland Models: Review and Prospects

Minor differences in sand physicochemistry lead to major differences in bacterial community structure and function after exposure to synthetic acid mine drainage

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