Denitrification in a natural wetland receiving secondary treated effluent

Brodrick, Stephanie J.; Cullen, Peter; Maher, William A.

doi:10.1016/0043-1354(88)90037-1

Cited by 60 publications

(24 citation statements)

References 28 publications

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“…Similarly, average denitrification rates were significantly higher (a = 0.05) in the disturbed hardwood swamp (255 + 10 pmol N m-' h-l) (average f S. E. for duplicate cores) relative to the undisturbed hardwood swamp (160 & 10 umol N me2 h-l). This is consistent with experimental studies in which denitrification rates were higher after additions of sewage or fertilizer N directly to cypress domes (Dierberg & Brezonik 1983) and to a wetland in Australia (Brodrick et al 1988).…”

Section: Denitrification Rates At Ambient Field Nitrate Concentrationssupporting

confidence: 87%

Linkages between organic matter mineralization and denitrification in eight riparian wetlands

Seitzinger¹

1994

Biogeochemistry

160

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Abstract. Denitrification (N, production) and oxygen consumption rates were measured at ambient field nitrate concentrations during summer in sediments from eight wetlands (mixed hardwood swamps, cedar swamps, heath dominated shrub wetland, herbaceous peatland, and a wetland lacking live vegetation) and two streams. The study sites included wetlands in undisturbed watersheds and in watersheds with considerable agricultural and/or sewage treatment effluent input. Denitrification rates measured in intact cores of water-saturated sediment ranged from 5 20 to 260 pmol N ma h-r among the three undisturbed wetlands and were less variable (180 to 260 Fmol N mm2 h-') among the four disturbed wetlands. Denitrification rates increased when nitrate concentrations in the overlying water were increased experimentally (1 up to 770 PM), indicating that nitrate was an important factor controlling denitrification rates. However, rates of nitrate uptake from the overlying water were not a good predictor of denitrification rates because nitrification in the sediments also supplied nitrate for denitrification. Regardless of the dominant vegetation, pH, or degree of disturbance, denitrification rates were best correlated with sediment oxygen consumption rates (r* = 0.912) indicating a relationship between denitrification and organic matter mineralization and/or sediment nitrification rates. Rates of denitrification in the wetland sediments were similar to those in adjacent stream sediments. Rates of denitrification in these wetlands were within the range of rates previously reported for water-saturated wetland sediments and flooded soils using whole core 15N techniques that quantify coupled nitrification/denitrification, and were higher than rates reported from aerobic (non-saturated) wetland sediments using acetylene block methods.

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Section: Denitrification Rates At Ambient Field Nitrate Concentrationssupporting

confidence: 87%

Linkages between organic matter mineralization and denitrification in eight riparian wetlands

Seitzinger¹

1994

Biogeochemistry

160

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“…Also the enhanced release of nitrogen (as nitrate), due to changes in the natural distribution of forested areas, fields, and wetland is not recognized. Natural wetlands with their biological activity have a very significant capacity for ,reduction of various nitrogen forms to elemental nitrogen [14].…”

Section: Categories Of Pollutantsmentioning

confidence: 99%

Water Quality Genesis and Disturbances of Natural Freshwaters

Falkenmark

Allard

1991

Water Pollution

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“…Figure 1 summarizes all journal publications in the field of TWs wetlands where a microbial community assessment technique was used over the period of 1988 to July 2016. The field of microbial community assessment and microbiology (in general) goes back much farther than 1988, however, as far as the author was able to find (using the methods employed) Brodrick et al [31] is the first available peer reviewed journal article where a constructed wetland microbial community is directly assessed. The article was published in Water Research and describes the study of a 3.3 ha natural wetland in southeast Australia that had been used for tertiary water treatment for more than a decade.…”

Section: Microbial Community Assessment In Treatment Wetlands From 19mentioning

confidence: 99%

“…assessment. Brodrick et al [31] is a good example of using microbial community data to better understand a system's operation, and further use this information to recommend a design augmentation to potentially increase the water treatment effectiveness of the investigated TW (or TWs in general). Following this first known activity assessment, the first study utilizing enumeration was found in 1994, the first study utilizing a structural analysis was found in 2001, and the first microbial community function study in 2004.…”

Section: Microbial Community Assessment In Treatment Wetlands From 19mentioning

confidence: 99%

“…Recommendations were made to spread the wastewater in a more diffuse fashion across the top of the wetland area to better make use of the more active top layers for denitrification. For the present meta-analysis, Brodrick et al [31] was classified as being focused on nitrogen removal, and utilized a method of activity measurement, specifically a nitrogen transformation methodology of activity assessment. Brodrick et al [31] is a good example of using microbial community data to better understand a system's operation, and further use this information to recommend a design augmentation to potentially increase the water treatment effectiveness of the investigated TW (or TWs in general).…”

Section: Microbial Community Assessment In Treatment Wetlands From 19mentioning

confidence: 99%

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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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Denitrification in a natural wetland receiving secondary treated effluent

Cited by 60 publications

References 28 publications

Linkages between organic matter mineralization and denitrification in eight riparian wetlands

Linkages between organic matter mineralization and denitrification in eight riparian wetlands

Water Quality Genesis and Disturbances of Natural Freshwaters

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

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