Denitrification- and anammox-dominant simultaneous nitrification, anammox and denitrification (SNAD) process in subsurface flow constructed wetlands

Chen, Danyue; Gu, Xushun; Zhu, Wenying; He, Shengbing; Wu, Fei; Huang, Jung-Chen; Zhou, Weili

doi:10.1016/j.biortech.2018.09.123

Cited by 88 publications

(16 citation statements)

References 32 publications

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“…The strongest determinant of effluent N concentrations across this set of ten studies was influent concentration; HRT, HLR and wetland area did not exert any appreciable effect. This result may be a product of the relatively small sample size, but it may also indicate opportunities to promote diverse microbiomes and associated microbially mediated N cycling processes through wetland design (e.g., Chen et al, 2019;Pelissari et al, 2018). While the TP concentrations discharged from this set of treatment wetlands were generally lower than the influent concentrations, dissolved P forms changed little or increased in concentration.…”

Section: Constructed Wetlands For Open-air Ponds and Aquaculture Wastewatermentioning

confidence: 88%

Constructed Wetlands for Water Quality Improvement: A Synthesis on Nutrient Reduction from Agricultural Effluents

Messer¹,

Trisha²,

Moore³

et al. 2021

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Abstract. Excess nutrients from agricultural settings contribute to surface water and groundwater impairment. Constructed wetlands have been widely used for water quality protection in various agricultural systems. We used a synthesis approach to document the performance of constructed wetlands for nutrient removal from a range of landscapes and geographic regions with the following objectives: (1) review the current use of constructed wetlands in agricultural applications, (2) summarize the nutrient removal efficiency of constructed wetlands, and (3) identify the geographic usage and costs associated with constructed wetlands. We reviewed over 130 publications and reports to characterize nutrient removal performance for the following types of agricultural effluents: cropland surface and subsurface drainage, and wastewater from livestock production, greenhouse, aquaculture, and hydroponic systems. Data from the reviewed studies indicate that constructed wetlands are efficient in protecting water quality in agricultural production settings. However, differences in constructed wetland characteristics reported by the studies suggest that standards are needed to ensure nutrient removal goals are met based on wetland design. Researchers should consider including basic performance parameters for constructed wetlands in published reports, including influent and effluent concentrations, hydraulic retention time, hydraulic loading rate, watershed to treatment wetland ratios, and plant species and relative cover. Future studies are needed to explore cost-benefit analyses to assess the feasibility and potential promotion of wetland incentive programs in various geographic regions and watershed nonpoint-source pollution goals for using these systems in agricultural settings. Keywords: Agricultural wastewater, Agricultural water quality, Aquaculture, Cropland runoff, Greenhouse, Hydroponic, Livestock, Review, Subsurface, Treatment wetland.

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Section: Constructed Wetlands For Open-air Ponds and Aquaculture Wastewatermentioning

confidence: 88%

Constructed Wetlands for Water Quality Improvement: A Synthesis on Nutrient Reduction from Agricultural Effluents

Messer¹,

Trisha²,

Moore³

et al. 2021

Transactions of the ASABE

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“…Plants are the most commonly used biological elements in the construction and management of CWs, and play important roles in pollutant removal, both directly and indirectly, through stimulating microbial growth. Numerous studies have shown that the indirect roles of plants (e.g., increases in hydraulic retention time, creation of aerobic-anaerobic micro-zones, decreases in the resuspension of contaminants in sediments) are substantial, while their direct role is usually limited [80][81][82][83][84]. In particular, effective plant-bacteria relationships can successfully remove a large number of contaminants in wastewater, including a variety of biotoxic substances (e.g., heavy metals and antibiotics).…”

Section: Vegetation Has Multiple Effects On Treatment Efficiency Of Cwsmentioning

confidence: 99%

Can Constructed Wetlands be Wildlife Refuges? A Review of Their Potential Biodiversity Conservation Value

et al. 2020

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The degradation of wetland ecosystems is currently recognized as one of the main threats to global biodiversity. As a means of compensation, constructed wetlands (CWs), which are built to treat agricultural runoff and municipal wastewater, have become important for maintaining biodiversity. Here, we review studies on the relationships between CWs and their associated biodiversity published over the past three decades. In doing so, we provide an overview of how wildlife utilizes CWs, and the effects of biodiversity on pollutant transformation and removal. Beyond their primary aim (to purify various kinds of wastewater), CWs provide sub-optimal habitat for many species and, in turn, their purification function can be strongly influenced by the biodiversity that they support. However, there are some difficulties when using CWs to conserve biodiversity because some key characteristics of these engineered ecosystems vary from natural wetlands, including some fundamental ecological processes. Without proper management intervention, these features of CWs can promote biological invasion, as well as form an ‘ecological trap’ for native species. Management options, such as basin-wide integrative management and building in more natural wetland components, can partially offset these adverse impacts. Overall, the awareness of managers and the public regarding the potential value of CWs in biodiversity conservation remains superficial. More in-depth research, especially on how to balance different stakeholder values between wastewater managers and conservationists, is now required.

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“…However, with time many studies reported that denitrifiers are common and usually dominant in PNA systems. Thus, these bacteria may contribute to the overall nitrogen removal potential of the PNA microbiome (Agrawal et al, 2017; Chen et al, 2019; Chu et al, 2015; Pereira et al, 2017; Persson et al, 2017; Y. Wang et al, 2019). Denitrification is a facultative respiratory pathway reducing nitrate (NO 3 − ), nitrite (NO 2 − ), nitric oxide (NO), and nitrous oxide (N 2 O) to nitrogen gas (N 2 ) catalyzed by four types of nitrogen reductases in sequence: nitrate reductase ( Nar ), nitrite reductase ( Nir ), nitric oxide reductase ( Nor ), and nitrous oxide reductase ( Nos ; Zumft, 1997).…”

Section: Introductionmentioning

confidence: 99%

Targeted metagenomics reveals extensive diversity of the denitrifying community in partial nitritation anammox and activated sludge systems

Orschler

Agrawal

Lackner

2020

Biotech & Bioengineering

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The substantial presence of denitrifiers has already been reported in partial nitritation anammox (PNA) systems using the 16S ribosomal RNA (rRNA) gene, but little is known about the phylogenetic diversity based on denitrification pathway functional genes. Therefore, we performed a metagenomic analysis to determine the distribution of denitrification genes and the associated phylogeny in PNA systems and whether a niche separation between PNA and conventional activated sludge (AS) systems exists. The results revealed a distinct abundance pattern of denitrification pathway genes and their association to the microbial species between PNA and AS systems. In contrast, the taxonomic analysis, based on the 16S rRNA gene, did not detect notable variability in denitrifying community composition across samples. In general, narG and nosZa2 genes were dominant in all samples. While the potential for different stages of denitrification was redundant, variation in species composition and lack of the complete denitrification gene pool in each species appears to confer niche separation between PNA and AS systems. This study suggests that targeted metagenomics can help to determine the denitrifying microbial composition at a fine-scale resolution while overcoming current biases in quantitative polymerase chain reaction approaches due to a lack of appropriate primers.

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Denitrification- and anammox-dominant simultaneous nitrification, anammox and denitrification (SNAD) process in subsurface flow constructed wetlands

Cited by 88 publications

References 32 publications

Constructed Wetlands for Water Quality Improvement: A Synthesis on Nutrient Reduction from Agricultural Effluents

Constructed Wetlands for Water Quality Improvement: A Synthesis on Nutrient Reduction from Agricultural Effluents

Can Constructed Wetlands be Wildlife Refuges? A Review of Their Potential Biodiversity Conservation Value

Targeted metagenomics reveals extensive diversity of the denitrifying community in partial nitritation anammox and activated sludge systems

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