Clogging in subsurface-flow treatment wetlands: Measurement, modeling and management

Nivala, Jaime; Knowles, Paul; Dotro, Gabriela; García, Joan; Wallace, Scott

doi:10.1016/j.watres.2011.12.051

Cited by 194 publications

(97 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, various mechanistic models for simulating the clogging behavior (for example Hyánková et al 2006;Hua et al 2010) have achieved mixed degrees of success (Nivala et al 2012) and they are still in the development stage. Further, the effects of climatic conditions (such as changes in temperature, humidity and rainfall etc) on performance of CWs can also be studied.…”

Section: Pollutant Decaymentioning

confidence: 99%

Modeling of subsurface horizontal flow constructed wetlands using OpenFOAM®

Kadaverugu

2016

Model. Earth Syst. Environ.

View full text Add to dashboard Cite

Natural purification of pollutants is one of the major ecosystem services provided by wetlands. The phenomenon of natural treatment is exploited by constructing artificial wetlands for the treatment of domestic wastewater. Various wetland models developed in the recent past range from simplistic regression analysis to highly complex deterministic systems. However, these models doesn't suit to the moderate requirements of environmental practitioners for designing appropriate wetland systems. The present model simulates the dynamic behavior of sub-surface horizontal flow wetland systems by considering the non-linear hydrodynamics and pollutant transport, developed in an open source computational fluid dynamics environment-OpenFOAM Ò . The non-linear movement of wastewater in porous media is coupled with the advectiondispersion-decay multi-physics phenomenon of pollutant with temperature dependent rate kinetics. Sensitivity analysis of the model showed that, van Genuchten's filter media shape parameters a, n, and decay constant k influences the treatment efficiency of wetlands. Further, the model is useful in visualizing the spatio-temporal profiles of pollutants and hydrodynamics which eventually guide the environmental practitioners in better design of treatment wetland systems.

show abstract

Section: Pollutant Decaymentioning

confidence: 99%

Modeling of subsurface horizontal flow constructed wetlands using OpenFOAM®

Kadaverugu

2016

Model. Earth Syst. Environ.

View full text Add to dashboard Cite

show abstract

“…The pore clogging of porous media by biofilms is known as "bioclogging" [8,12,13]. Although there are numerous cases where bioclogging has detrimental consequences, such as progressive plugging of water wells, ponds and trenches used for artificial aquifer recharge [14], or wetland wastewater treatment [15][16][17], there are several instances where bacteria and bioclogging may be used to advantage. Bacteria are known to enhance oil recovery [18,19].…”

Section: Introductionmentioning

confidence: 99%

Assessment of CO2 Injection in Fractured Calcite Rock Clogged by Pseudomonas putida Biofilm

Sygouni¹

2018

Int. J. Green Technol.

View full text Add to dashboard Cite

Abstract:The effect of a possible accidental carbon dioxide (CO2) leakage from deep geologic storage reservoirs on shallow subsurface sources of potable water is receiving considerable attention, because groundwater quality can be compromised. In this work, the effect of a gas CO2 leakage on the permeability of a fractured calcite rock bioclogged with Pseudomonas (P.) putida biofilm was investigated experimentally under ambient conditions. Initially, a batch experiment of P. putida inactivation in the presence and absence of calcite was performed. Subsequently, P. putida biofilm was developed in a fractured calcite rock from Mons, Belgium. The fractured rock permeability was measured before and after bioclogging, as well as after CO2 injection. The experimental results indicated that calcite can enhance P. putida growth, and that a P. putida biofilm formation can practically eliminate fractured rock permeability (99% reduction). However, sudden CO2 injection increased the permeability of the bioclogged fractured calcite rock, but only to a level substantially lower than that corresponding to the initial permeability of the clean fractured rock.

show abstract

“…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]). 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

View full text Add to dashboard Cite

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...

show abstract

Clogging in subsurface-flow treatment wetlands: Measurement, modeling and management

Cited by 194 publications

References 63 publications

Modeling of subsurface horizontal flow constructed wetlands using OpenFOAM®

Modeling of subsurface horizontal flow constructed wetlands using OpenFOAM®

Assessment of CO2 Injection in Fractured Calcite Rock Clogged by Pseudomonas putida Biofilm

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

Contact Info

Product

Resources

About