Nitrogen removal in constructed wetland systems

Lee, Chang-gyun; Fletcher, Tim D.; Sun, Guang–Zhen

doi:10.1002/elsc.200800049

Cited by 456 publications

(207 citation statements)

References 91 publications

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“…The condition of anoxic region was probably not favoured in the output final WC due to the lower concentration of nitrate ions which reduces the action of denitrifying microorganisms [53].…”

Section: Resultsmentioning

confidence: 99%

Cation and anion monitoring in a wastewater treatment pilot project

Almeida

Vargas-Zerwes

Ferreira-Bastos

et al. 2015

Rev. Fac. Ing. Antioquia

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2.7 billion people, and the volume of water will have to increase 41% to meet the needs of the population [7]. In poor countries, the problems are more alarming in relation to untreated wastewater [10].Even though most of the farm households are aware of the environmental and health consequences related to the crop irrigation with wastewater, they still use it because of its cost advantages. This issue is one of the sanitary challenges also found at water-scarce regions [11]. This practice is widely used in Africa; for example, in [12] observed that wastewater treatment systems do not always reach enough quality for the purposes of irrigation and for non-potable applications. Therefore, water reuse might be dangerous for the farmers in some regions. . The results also showed that CWs system is suitable for removing ions from the wastewater. Cation and anion monitoring in a wastewater treatment pilot project RESUMEN:El propósito del tratamiento de aguas residuales es la reutilización del agua.Esta reduce el consumo de agua potable y previene la contaminación del agua de primer uso. La reutilización del agua ya se ha implementado con éxito en diferentes lugares. Los tratamientos que utilizan los humedales artifi ciales son ampliamente estudiados como una alternativa más económica y ecológica para tratar las aguas residuales. En estos sistemas, el control de especies inorgánicas también es importante. Este estudio ha monitoreado cationes (Na + . Los resultados también mostraron que el sistema CWs está adecuado para la eliminación de iones del agua residual.,

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Section: Resultsmentioning

confidence: 99%

Cation and anion monitoring in a wastewater treatment pilot project

Almeida

Vargas-Zerwes

Ferreira-Bastos

et al. 2015

Rev. Fac. Ing. Antioquia

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“…During the exponential growth phase both ammonia-N and nitrate-N concentrations decreased rapidly in the planted wetlands. This was due to both plant uptake and denitrification [21]. However, plant uptake is only between 0 -5% [22].…”

Section: Discussionmentioning

confidence: 99%

Potential Macrophytes for Nitrogen Removal from Domestic Wastewater in Horizontal Subsurface Flow Constructed Wetlands in Tanzania

A.T¹,

H.B

H.J.Y³

et al. 2013

TOENVIEJ

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Abstract:The role of six indigenous macrophytes (Cypreus grandis, C. dubis, Kyllinga erectus, Phragmites mauritianus, Typha domingensis and T. capensis) was investigated for nitrogen removal in horizontal subsurface flow constructed wetlands at the University of Dar es Salaam in Tanzania receiving waste stabilization ponds effluent. Seven horizontal subsurface flow constructed wetlands were fed with the same source of domestic wastewater, where six of them were planted with a monoculture macrophytic species while the seventh was not planted and it acted as a control cell. On alternatedays' basis for twenty eight weeks both the influent and effluent water samples from each cell were collected and sent to the laboratory for ammonia-N, nitrate-N and Total Kjeldahl-N analysis. Nitrogen bioaccumulation and plant biomasses were analyzed during the transplanting time, after ten weeks and after flowering. Temperature, pH and plant heights were determined in situ. Results show that overall nitrogen removal was through denitrification where K.erectus performed better (75.59%) than the rest.Since P.mauritianus(74.37% )established well and had the longest growing period after harvest useso therefore it was selected as the best macrophyte. More research needs to be done prior to making a final decision on the use of any of these macrophytes for nitrogen removal depending on the weather and soils of the specific area.

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“…However, as Flanders is a densely populated region with over 460 inhabitants per km 2 , conflicting demands among various types of land use must be considered. In this region Constructed Wetlands (CWs) have been extensively used for the treatment of urban, industrial, and dairy wastewater [9]; though none of them have been tested to treat agricultural runoff as compared to other countries such as the United States, Norway, Turkey, Sweden, the Netherlands, among others [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Excessive amounts of nitrogen in water lead to oxygen depletion affecting aquatic life and organisms. Nitrogen could be present in surface water in different forms, but total nitrogen (TN), ammonium nitrogen (NH 4 -N), organic nitrogen, nitrite (NO 2 ), and nitrate (NO 3 ) are the main forms that end up in the surface water [2,3]. Several studies have reported that nitrate and nitrite concentrations in rivers greatly differ from each other, with nitrite concentrations being negligible in most cases.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Integration of Wetlands along Small European Waterways to Address Diffuse Nitrate Pollution

Donoso

Gobeyn

Boets

et al. 2017

Water

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Nitrate concentrations in numerous European fresh watercourses have decreased due to end-of-pipe measures towards manure and fertilization management, but fail to meet the environmental objectives. The implementation of complementary measures to attenuate diffuse nitrate pollution in densely populated regions characterised by limited available area has been barely studied. To tackle this issue, this study evaluates the feasibility of integrating Constructed Wetlands (CWs) along waterways as a promising tool to facilitate compliance with the nitrate regulations. The aim is to calculate the required area of land alongside a specific watercourse to integrate CWs to reduce nitrate concentrations consistently below the 11.3 and 5.65 mgNO 3 -N/L levels, according to the Nitrates Directive and the Flemish Environmental Regulations. Nitrate-nitrogen removal efficiencies achieved at case study CWs were compared and validated with reported values to estimate the needed wetland areas. In addition, the removal efficiencies and areas needed to meet the standards were calculated via the kinetic model by Kadlec and Knight. The predicted areas by both methods indicated that CWs of 1.4-3.4 ha could be implemented in certain regions, such as Flanders (Belgium), with restricted available land. To conclude, three designs for ICWs (Integrated Constructed Wetlands) are proposed and evaluated, assessing the feasibility of their implementation.

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Nitrogen removal in constructed wetland systems

Cited by 456 publications

References 91 publications

Cation and anion monitoring in a wastewater treatment pilot project

Cation and anion monitoring in a wastewater treatment pilot project

Potential Macrophytes for Nitrogen Removal from Domestic Wastewater in Horizontal Subsurface Flow Constructed Wetlands in Tanzania

Assessing the Integration of Wetlands along Small European Waterways to Address Diffuse Nitrate Pollution

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