Enhanced denitrification in a bioaugmented horizontal subsurface flow filter

Zaytsev, Igor; Mander, Ülo; Lõhmus, Krista; Nurk, Kaspar

doi:10.1016/j.ecoleng.2010.10.007

Cited by 13 publications

(3 citation statements)

References 26 publications

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“…The system was established in June 2009; a detailed description and scheme are provided by Nurk et al [30] and Zaytsev et al [31]. Figure A1 shows a schematic representation of the mesocosms (MCs) used in this experiment.…”

Section: Study System Descriptionmentioning

confidence: 99%

Dynamics of Bacterial Community Abundance and Structure in Horizontal Subsurface Flow Wetland Mesocosms Treating Municipal Wastewater

Oopkaup

Truu

Nõlvak

et al. 2016

Water

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Dynamics of bacterial community abundance and structure of a newly established horizontal subsurface flow (HSSF) pilot-scale wetland were studied using high-throughput sequencing and quantitative polymerase chain reaction (PCR) methods. Bacterial community abundance increased rapidly within one month and stabilised thereafter in three replicate HSSF constructed wetland (CW) mesocosms. The most dominant phylum was Proteobacteria, followed by Bacteroidetes in wetland media biofilms and Firmicutes in influent wastewater. CW bacterial community diversity increased over time and was positively related to the wastewater treatment efficiency. Increase in the abundance of total bacteria in the community was accompanied with the abundance of denitrifying bacteria that promoted nitrate and nitrite removal from the wastewater. During the 150-day study period, similar patterns of bacterial community successions were observed in replicate HSSF CW mesocosms. The data indicate that successions in the bacterial community in HSSF CW are shaped by biotic interactions, with a significant contribution made by external abiotic factors such as influent chemical parameters. Network analysis of the bacterial community revealed that organic matter and nitrogen removal in HSSF CW could be, in large part, allocated to a small subset of tightly interconnected bacterial species. The diversity of bacterial community and abundance of denitrifiers were good predictors of the removal efficiency of ammonia, nitrate and total organic C in HSSF CW mesocosms, while the removal of the seven-day biochemical oxygen demand (BOD 7 ) was best predicted by the abundance of a small set of bacterial phylotypes. The results suggest that nitrogen removal in HSSF CW consist of two main pathways. The first is heterotrophic nitrification, which is coupled with aerobic denitrification and mediated by mixotrophic nitrite-oxidizers. The second pathway is anaerobic denitrification, which leads to gaseous intermediates and loss of nitrogen as N 2 .

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Section: Study System Descriptionmentioning

confidence: 99%

Dynamics of Bacterial Community Abundance and Structure in Horizontal Subsurface Flow Wetland Mesocosms Treating Municipal Wastewater

Oopkaup

Truu

Nõlvak

et al. 2016

Water

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“…During these four decades researchers have continuously been looking for improvement of treatment performance. The improvements include, for example, the use of hybrid constructed wetlands (Ye and Li, 2009;Vymazal, 2013a), baffled constructed wetlands (Zhai et al, 2011;Wang et al, 2012), effluent recirculation (Brix et al, 2003;Sun et al, 2003;Prost-Boucle and Molle, 2012), tidal operation (Sun et al, 1999;Chan et al, 2008), artificial aeration (Nivala et al, 2007;Zhang et al, 2010a), flow direction reciprocation (Behrends, 2000), bioaugmentation (Runes et al, 2001;Zaytsev et al, 2011) or the use of various substrates for enhanced phosphorus removal (Mann and Bavor, 1993;Jenssen and Krogstad, 2003;Vohla et al, 2011).…”

Section: Introductionmentioning

confidence: 98%

Seasonal growth pattern of Phalaris arundinacea in constructed wetlands with horizontal subsurface flow

Březinová

Vymazal

2015

Ecological Engineering

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“…Wu et al 2015) These engineered systems are designed to treat contaminants in surface water, groundwater or waste streams by using natural functions of wetland vegetation, soils and their microbial populations (Vymazal 2014). They have a great potential for the treatment of wastewater of different origin Zaytsev et al 2011) such as domestic sewage, agricultural wastewater, industrial effluent, mine drainage, landfill leachate, urban runoff, and polluted river water (Liu et al 2015). CWs have been successfully used to mitigate environmental pollution by removing of a wide variety of pollutants from wastewater such as organic compounds, suspended solids, pathogens, metals, and nutrients (Zhang et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of rhizocompetence in pathogenic bacteria removal of a constructed wetland system

Saad

Said

Sanz-Sáez

et al. 2019

Water Science and Technology

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The main goal of the present study was to enhance the rhizobacterium potential in a horizontal subsurface flow constructed wetland system planted with Phragmites australis, through environmentally friendly biological approaches. The bioinoculation of antagonist bacteria has been used to promote higher rhizosphere competence and improve pathogenic bacteria removal from wastewater. The experiment was performed both with single and sequential bioinoculation. The results showed that strain PFH1 played an active role in pathogenic bacteria removal, remarkably improving inactivation kinetics of the pathogenic tested bacterium Salmonella typhi in the plant rhizosphere. The single bioinoculation of selected bacteria into the rhizosphere of P. australis improved the kinetics of S. typhi inactivation by approximately 1 U-Log10 (N/N0) (N is the number of viable cultured bacteria at time t, N0 is the number of viable and cultivable bacteria at time t0) compared to the control. By a series of multi-bioinoculations, the enhancement of pathogenic bacteria reduction compared to the inhibition rate in the pilot-scale control was of 2 U-Log10(N/N0). These findings suggested that this strain represents a promising candidate to enhance water purification in constructed wetlands.

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Enhanced denitrification in a bioaugmented horizontal subsurface flow filter

Cited by 13 publications

References 26 publications

Dynamics of Bacterial Community Abundance and Structure in Horizontal Subsurface Flow Wetland Mesocosms Treating Municipal Wastewater

Dynamics of Bacterial Community Abundance and Structure in Horizontal Subsurface Flow Wetland Mesocosms Treating Municipal Wastewater

Seasonal growth pattern of Phalaris arundinacea in constructed wetlands with horizontal subsurface flow

Enhancement of rhizocompetence in pathogenic bacteria removal of a constructed wetland system

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