BIO_PORE, a mathematical model to simulate biofilm growth and water quality improvement in porous media: Application and calibration for constructed wetlands

Samsó, Roger; García, Jesús Miguel Bairán

doi:10.1016/j.ecoleng.2013.01.021

Cited by 87 publications

(80 citation statements)

References 40 publications

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“…• The HYDRUS Wetland Module [7] implemented in the HYDRUS simulation software [13], and • BIO_PORE [8] implemented in the COMSOL Multiphysics TM platform.…”

Section: Of 18mentioning

confidence: 99%

Applying Process-Based Models for Subsurface Flow Treatment Wetlands: Recent Developments and Challenges

Langergraber

2016

Water

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Abstract:To date, only few process-based models for subsurface flow treatment wetlands have been developed. For modelling a treatment wetland, these models have to comprise a number of sub-models to describe water flow, pollutant transport, pollutant transformation and degradation, effects of wetland plants, and transport and deposition of suspended particulate matter. The two most advanced models are the HYDRUS Wetland Module and BIO-PORE. These two models are briefly described. This paper shows typical simulation results for vertical flow wetlands and discusses experiences and challenges using process-based wetland models in relation to the sub-models describing the most important wetland processes. It can be demonstrated that existing simulation tools can be applied for simulating processes in treatment wetlands. Most important for achieving a good match between measured and simulated pollutant concentrations is a good calibration of the water flow and transport models. Only after these calibrations have been made and the effect of the influent fractionation on simulation results has been considered, should changing the parameters of the biokinetic models be taken into account. Modelling the effects of wetland plants is possible and has to be considered when important. Up to now, models describing clogging are the least established models among the sub-models required for a complete wetland model and thus further development and research is required.

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“…• The HYDRUS Wetland Module [7] implemented in the HYDRUS simulation software [13], and • BIO_PORE [8] implemented in the COMSOL Multiphysics TM platform.…”

Section: Of 18mentioning

confidence: 99%

Applying Process-Based Models for Subsurface Flow Treatment Wetlands: Recent Developments and Challenges

Langergraber

2016

Water

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“…As a distinctive feature from the original CWM1's formulation, in this model slowly biodegradable and inert particulate COD (XS and XI, respectively) are divided into aqueous (XS m and XI m ) and solid (XS f and XI f ) phases (Samsó and García 2013a). Thus, it considers 18, instead of the 16 components described in the original version of CWM1.…”

Section: Bio_porementioning

confidence: 98%

“…Another advantage is that HYDRUS-2D can use different biokinetic models depending on whether a VF or a HF CW is to be simulated. However, the model has only been applied and calibrated for short simulation time frames, since bacterial growth is not limited and hence the high bacterial concentrations reached after a short simulation time prevents model convergence (Samsó and García 2013a). Another unresolved issue of this model is its inability to simulate the transport and retention of particulate components and thus clogging (Langergraber and Š imůnek 2012).…”

Section: Feature Comparisonmentioning

confidence: 99%

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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“…Stratification of biomass in subsurface flow systems is well documented [10]. At some point an equilibrium between attachment and detachment (due to local-scale velocity and shear stress) can occur allowing for steady state operation with no bio-clogging [11]. This steady-state operation is however sometimes not possible due either to simple solids build up, or in part due to the nutrient loading which can drive the microbial community towards anabolic based processes (i.e., creation of biomass/biofilm) which can eventually lead to clogging of pore spaces (see Nivala et al [12]).…”

Section: Introductionmentioning

confidence: 99%

“…This steady-state operation is however sometimes not possible due either to simple solids build up, or in part due to the nutrient loading which can drive the microbial community towards anabolic based processes (i.e., creation of biomass/biofilm) which can eventually lead to clogging of pore spaces (see Nivala et al [12]). Recent modelling exercises have included these dynamics into fundamental TW investigations [11,[13][14][15], and predict either heterogeneous or homogenous clogging depending on the specific model used.…”

Section: Introductionmentioning

confidence: 99%

Microbial Community Assessment in Wetlands for Water Pollution Control: Past, Present, and Future Outlook

Weber

2016

Water

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Abstract:The field of treatment wetlands (TWs) is rapidly expanding and, arguably, is tasked with studying and understanding one of the most complex water treatment systems available. Microbial communities are generally considered to be responsible for the majority of wastewater constituent degradation in TWs. However, they are also known to be spatially heterogeneous, temporally dynamic, as well as structurally and functionally diverse. Presented here is a meta-analysis of all peer reviewed TW journal articles which utilized a microbial community assessment methodology over the period of 1988 to July 2016. A total of 1101 papers were reviewed, 512 from 1988 to 2012, 215 of which included a microbial community assessment aspect and were subsequently classified as representing past research, and 589 from 2013 to July 2016, 196 of which were classified as representing current TW microbial community research. In general, TW microbial community research has increased over time, with a marked surge in the past four years. Microbial community structure is currently the most commonly used methodological type followed by activity, enumeration and function, respectively. Areas of research focus included nitrogen transformations (156), organic degradation (33), and emerging contaminants (32), with general characterization studies also accounting for a significant proportion (243). Microbial communities from a range of TW systems have been investigated over the last four years with meso-scale (10-1000 L) being the most commonly studied system size followed by large-scale (>100,000 L), micro-scale (<10 L), and pilot-scale (1000-100,000 L). Free water surface flow (SF), horizontal subsurface flow (HF), and vertical flow (VF) systems are being studied in approximately equal proportions with the majority of studies focused on gaining fixed media/biofilm samples for analysis (rather than from the rhizosphere or interstitial water). Looking at efforts from a regional perspective shows Asia to be publishing the majority of research with a main focus on VF systems and structural community assessment. European and North American studies are generally more evenly distributed among structure, function, activity, and enumeration with the majority of studies completed on HF systems. South America, Africa, and Oceania published fewer studies but focused on structural community assessment with a selection of HF, SF and VF investigations. Great strides are being made in the field of microbial community assessment in TWs with functional assessment methods being developed, better utilized, and being related directly to water treatment. The use of high-powered metagenomics sequencing such as Illumina HiSeq instrumentation is on the rise, as is the development and utilization of functional assays such as DNA microarrays and community level physiological profiling allowing for more complete community assessment. Used in concert with activity, enumeration and newly implemented stable isotope methodologies, the field of TWs is certainly moving a...

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BIO_PORE, a mathematical model to simulate biofilm growth and water quality improvement in porous media: Application and calibration for constructed wetlands

Cited by 87 publications

References 40 publications

Applying Process-Based Models for Subsurface Flow Treatment Wetlands: Recent Developments and Challenges

Applying Process-Based Models for Subsurface Flow Treatment Wetlands: Recent Developments and Challenges

Subsurface Flow Constructed Wetland Models: Review and Prospects

Microbial Community Assessment in Wetlands for Water Pollution Control: Past, Present, and Future Outlook

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