The influence of plants on nitrogen removal from landfill leachate in discontinuous batch shallow constructed wetland with recirculating subsurface horizontal flow

Białowiec, Andrzej; Davies, L; Albuquerque, António; Randerson, Peter Frederick

doi:10.1016/j.ecoleng.2011.12.011

Cited by 57 publications

(20 citation statements)

References 41 publications

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“…It can cause serious issues when NO 3 − contamination has caused severe problem to surface water and ground water due to point sources and nonpoint sources of nitrogen leaching usually from landfill activities [1,2]. Previous studies revealed that high concentration of inorganic nitrogen compounds such as NO 3 − and numerous organic-N compounds present in leachate [3][4][5]. Indeed, leachate generated from landfills can cause considerable contamination that can be transmitted from environment into soils, surface water and groundwater [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…However, biological nitrogen removal in landfill leachate is a critical environmental problem due to the formation of ammonium (NH 4 + ). NH 4 + may inhibit the degradation process and produce bad smell and organic materials such as volatile fatty acids, phenolics and humic acids which can inhibit degradation of NO 3 − [5]. Since the ammonium-nitrogen strength is high, it could pose microbial inhibition problem [10].…”

Section: Introductionmentioning

confidence: 99%

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Removal of Nitrate by Eichhornia crassipes sp. in Landfill Leachate

2015

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− . This study shows that concentration of NO 3 − was higher in young landfill (27 mg/L) than that in old landfill (9 mg/L) at neutral pH. Finding of these results indicate that Eichhornia crassipes sp. has the ability to remove NO 3 − at different concentrations in three days. Approximately 69 and 64 % of NO 3 − that present in leachate from young landfill was removed in sample without dilution and 50 % dilution, respectively. While approximately 28 and 33.6 % of NO 3 − present in leachate collected from old landfill was removed in similar dilution samples. This study is very significant to identify the capability of Eichhornia crassipes sp. to remove NO 3 − in landfill leachate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of Nitrate by Eichhornia crassipes sp. in Landfill Leachate

2015

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“…Root oxygenation occurs in the daylight and depends to some extent on photosynthetic activity [59,60]. Oxygenation by roots has been shown to have a significant impact on important mechanisms of wastewater treatment in CWs, including influence on redox potential [61], which is critical in determining nitrogen fate, oxidation of some phytotoxins [56], and enhancement of microbial activity [62]. Vymazal [7] argued that root-derived aerobic dynamics is very limited in horizontal CWs and its role is minor in periodically loaded vertical CWs with short hydraulic-retention times.…”

Section: Microclimatic Conditionsmentioning

confidence: 99%

Role of Plants in a Constructed Wetland: Current and New Perspectives

Shelef

Gross

Rachmilevitch

2013

Water

178

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Abstract:The role of plants in the treatment of effluents by constructed wetland (CW) systems is under debate. Here, we review ways in which plants can affect CW processes and suggest two novel functions for plants in CWs. The first is salt phytoremediation by halophytes. We have strong evidence that halophytic plants can reduce wastewater salinity by accumulating salts in their tissues. Our studies have shown that Bassia indica, a halophytic annual, is capable of salt phytoremediation, accumulating sodium to up to 10% of its dry weight. The second novel use of plants in CWs is as phytoindicators of water quality. We demonstrate that accumulation of H 2 O 2 , a marker for plant stress, is reduced in the in successive treatment stages, where water quality is improved. It is recommended that monitoring and management of CWs consider the potential of plants as phytoremediators and phytoindicators.

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“…Oxygen is transported from aboveground through the rhizome and released into the soil [13], which has a big impact on redox potential [14] and microbial activity [15]. It is reported that about 10%-40% of the net photosynthetic production is released as root exudates, which can stimulate microbial growth and provide a carbon source for bacteria, including denitrifiers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Plant Harvesting on the Performance of Constructed Wetlands during Summer

Yang

Wang

Zhang

et al. 2016

Water

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Plants can remove pollutants through direct absorption and by providing habitats for microbes to stimulate their activities. The aboveground plant biomass is usually harvested to remove pollutants absorbed in plant tissues. However, the effect of plant harvesting during summer on the performance of constructed wetlands and microbial abundance is unclear. In this study, three types of microcosms were set up, including: cleared group (both shoots and roots were harvested), harvested group (only shoots were harvested) and unharvested group. The concentrations of ammonia nitrogen and chemical oxygen demand in the effluent of the harvested group were the lowest. The nitrogen mass balance showed that summer harvesting improved nitrogen absorbance by plants, which was 1.24-times higher than that in the unharvested group. Interestingly, the other losses were taken up by the highest amounts in the cleared group, which were 1.66-and 3.72-times higher than in the unharvested and harvested group, respectively. Quantitative polymerase chain reaction revealed that harvesting of shoots during summer increased the microbial abundance. Additionally, Proteobacteria was the dominant phylum among all bacteria according to pyrosequencing analysis. These results indicate that harvesting of shoots during summer has positive effects on pollutant removal and microbial abundance.

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The influence of plants on nitrogen removal from landfill leachate in discontinuous batch shallow constructed wetland with recirculating subsurface horizontal flow

Cited by 57 publications

References 41 publications

Removal of Nitrate by Eichhornia crassipes sp. in Landfill Leachate

Removal of Nitrate by Eichhornia crassipes sp. in Landfill Leachate

Role of Plants in a Constructed Wetland: Current and New Perspectives

Effect of Plant Harvesting on the Performance of Constructed Wetlands during Summer

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