Modeling Variably Saturated Water Flow and Multicomponent Reactive Transport in Constructed Wetlands

Langergraber, Günter; Šimůnek, Jirka

doi:10.1002/9781119060031.ch9

Cited by 10 publications

(26 citation statements)

References 36 publications

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“…Based on the simulation results the following conclusions can be drawn: • Despite differences in construction and operational conditions of the presented systems, the simulation using the HYDRUS Wetland module gives good results when adjustments to the standard parameter set of the CW2D biokinetic model (Langergraber and Šimůnek, 2005) have been made.…”

Section: Resultsmentioning

confidence: 81%

“…Table 3 shows measured and simulated influent and effluent concentrations for all four VF wetland systems. In the first step, simulations were carried out using the standard parameter set of the CW2D biokinetic model (Langergraber and Šimůnek, 2005). These results are referred to as the "standard" parameter set in Table 3.…”

Section: Resultsmentioning

confidence: 99%

“…The mathematical formulation of CW2D includes 12 components and nine processes. The components are dissolved oxygen (O 2 ), organic matter (OM) divided into readily available (CR), slowly available (CS), and inert organic matter (CI), heterotrophic microorganisms (XH), autotrophic microorganisms (XANs, XANb), nitrogen compounds as ammonium (NH 4 -N), nitrite (NO 2 -N), and nitrate (NO 3 -N) nitrogen, and nitrogen gas (N 2 ), as well as inorganic phosphorous (PO 4 -P) (Langergraber and Šimůnek, 2005). The nine processes described in CW2D are related to the activities of the heterotrophic and autotrophic bacteria groups, respectively (Table 2).…”

Section: Hydrus Wetland Modulementioning

confidence: 99%

“…The reactive transport simulation, including the biokinetic model, was carried out first using the soil and solute specific parameters proposed by Langergraber and Šimůnek (2011) and the standard parameter set of the CW2D module (Langergraber and Šimůnek, 2005). No adsorption processes were considered.…”

Section: Simulation Proceduresmentioning

confidence: 99%

“…Furthermore, SSF TWs can be divided into horizontal flow (HF) and vertical flow (VF) wetlands, whereby in HF wetlands mainly anaerobic and in VF wetlands mainly aerobic processes occur (Kadlec and Wallace, 2009). Two biokinetic model formulations are implemented in the HY-DRUS Wetland Module: CW2D (Langergraber and Šimůnek, 2005) that describes aerobic and anoxic processes and is mostly used for simulating VF wetlands and CWM1 (Langergraber et al, 2009a) that additionally describes anaerobic processes and is also applicable for HF wetlands. Their mathematical formulation is based on the IWA Activated Sludge Models (Henze et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Simulating vertical flow wetlands using filter media with different grain sizes with the HYDRUS Wetland Module

Pucher

Langergraber

2018

Journal of Hydrology and Hydromechanics

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Abstract:In this study, the simulation results of four vertical flow wetland systems using the HYDRUS Wetland Module are presented. The four wetland systems comprise three single-stage pilot scale systems and one full-scale two-stage system. The main difference between these systems is the filter media used, referred to as fine media, i.e., sand with a grain size distribution 0.063-4 mm, or coarse media, i.e., sand with grain size distributions between 1-4 mm, respectively. The water-flow simulation of each system is carried out using the single porosity van Genuchten-Mualem model. A good match between measured and simulated volumetric effluent flow rates could be achieved for all wetland systems. For reactive transport simulations, the CW2D biokinetic model was applied. First, simulations were run using the standard CW2D parameter set. For some systems, adjustments of the parameter set were needed in order to avoid unlimited bacteria growth. To better fit measured COD, NH 4 -N, and NO 3 -N effluent concentrations, adjustments of few parameters of the standard parameter set were required. The results show that for the VF wetlands with fine sand, no adjustments of the CW2D standard parameter set were needed, while for systems with coarser filter media as the main layer, the standard parameter set had to be adjusted to match simulated and measured effluent concentrations.

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Hydrus Wetland Modulementioning

confidence: 99%

Section: Simulation Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Simulating vertical flow wetlands using filter media with different grain sizes with the HYDRUS Wetland Module

Pucher

Langergraber

2018

Journal of Hydrology and Hydromechanics

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Treatment efficiency and recovery in sand filters for on-site wastewater treatment: Column studies and reactive modelling

Hamisi,

Renman,

Renman

et al. 2024

Journal of Cleaner Production

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Effect of temperature and loading frequency on the performance of vertical subsurface flow constructed wetlands: Modelling study using HYDRUS

Jayswal¹,

Rodríguez²

2021

Preprint

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Constructed wetlands are used in wastewater treatment for the removal of organic matter, nutrients, pathogens and other pollutants from water. The diversity of chemical, physical and biological processes taking place inside constructed wetlands (CWs) make them difficult systems for accurate quantitative description through conventional modelling approaches. However, existing modelling tools can bring valuable insight into important phenomena and interactions that might remain otherwise neglected. In this study the CW2D module under HYDRUS - 2D is used to identify the possible mechanisms by which temperature and loading frequency impacts the performance of the vertical subsurface flow constructed wetlands (VSSFCWs). An improvement on CWs design and operation guidelines in warm regions is intended. Case studies of a VSSFCW at 10C, 20C and 30C treating septic tank effluent are simulated with parameters adjusted for high temperature conditions. The simulation results suggest oxygen limitation as possibly constraining nitrification capacity at high temperatures. Simulations also suggest that higher loading frequencies enhance performance and capacity. This detailed mechanistic modelling study aims at bringing insight into possible non trivial interactions and mechanisms in CWs such that in conjunction with a necessary experimental validation, should lead to enhanced operation and design in warm regions.

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Modeling Variably Saturated Water Flow and Multicomponent Reactive Transport in Constructed Wetlands

Cited by 10 publications

References 36 publications

Simulating vertical flow wetlands using filter media with different grain sizes with the HYDRUS Wetland Module

Simulating vertical flow wetlands using filter media with different grain sizes with the HYDRUS Wetland Module

Treatment efficiency and recovery in sand filters for on-site wastewater treatment: Column studies and reactive modelling

Effect of temperature and loading frequency on the performance of vertical subsurface flow constructed wetlands: Modelling study using HYDRUS

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