Effects of macrophytes and external carbon sources on nitrate removal from groundwater in constructed wetlands

Lin, Ying-Feng; Jing, Shuh-Ren; Wang, Tze-Wen; Lee, Der-Yuan

doi:10.1016/s0269-7491(01)00299-8

Cited by 302 publications

(151 citation statements)

References 13 publications

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“…Narváez et al [34] reported a COD/NO À 3 -N ratio of 7.7:1 for a complete denitrification in HSSF CWs-treating leachates from nurseries. By addition of fructose, removal efficiency of greater than 90% for nitrate in groundwater was obtained in FWS CWs when the COD/NO À 3 -N > 3.5 [8]. In the present experiment, mean value of COD/ NO À 3 -N in the fed wastewater was only 2.0, and a significant fraction of the organic matter would be biodegraded within the upper layer of the down-flow chamber [38,39].…”

Section: Insufficient Carbon Sourcementioning

confidence: 64%

Section: Insufficient Carbon Sourcementioning

confidence: 99%

“…In addition, nitrate ammonification could also contribute to nitrate removal [31]. Among them, the microbial denitrification is recognized to be the dominant long-term mechanism for nitrate removal, especially at a high nitrate loading rate [8,20]. Several hydraulic factors, including HLR, water depth, and HRT, together with carbon source supplied, characteristics of wetland substrate, macrophyte species and density, microbial communities, etc.…”

Section: Influencing Factors For Nitrate Removal In the Ivcwsmentioning

confidence: 99%

“…It was reported that removal efficiencies for NO À 3 -N and NO À 2 -N increased with C/N ratio [8,20,35]. A significant effect of carbon addition on the nitrate removal was informed for the treatment of nitrate-contaminated wastewater using CWs [8,36,37]. Gagnon et al [37] reported that mean nitrate removal efficiency was just 7% in HSSF CW mesocosms treating hydroponics wastewater without carbon addition, but achieved about 70% in those with sucrose addition at a COD/NO À 3 -N ratio of 3.5:1.…”

Section: Insufficient Carbon Sourcementioning

confidence: 99%

“…In addition, nitrate is the predominant form of nitrogen pollutants in nonpoint drainage from fertile agricultural fields [5,6] and groundwater [7,8].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Chang¹,

Wu²,

Dai³

et al. 2013

Desalination and Water Treatment

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A B S T R A C TNitrate removal rates of two pilot-scale integrated vertical-flow constructed wetlands (IVCWs) treating tail water, under a hydraulic loading rate (HLR) of 250 mm/d with a mean influent NO À 3 -N concentration of 24.4 mg·L À1 , were evaluated. Mean NO À 3 -N removal efficiencies of 15.5 and 18.5% with mass removal rates of 1.01 g·m À2 ·d À1 and 1.16 g·m À2 ·d À1 for IVCW 1 (planted with Canna indica and Pontederia cordata) and 2 (planted with Typha orientalis and Arundo donax var. versicolor), respectively, were achieved. The removal rate constants as fitted by the first-order area-based model averaged 0.046 and 0.055 m·d À1 , respectively. Since NO À 3 -N was the dominant nitrogen form in the effluent, denitrification was the limiting step in nitrogen removal despite of favorable pH and anaerobic conditions in the wetland beds. Low availability of carbon source, high HLR, and low temperature could be the probable influencing factors for the observed low NO À 3 -N removal efficiencies. However, IVCW could be used to treat tail water for nitrate removal at a comparable high loading rate.

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Section: Insufficient Carbon Sourcementioning

confidence: 64%

Section: Insufficient Carbon Sourcementioning

confidence: 99%

Section: Influencing Factors For Nitrate Removal In the Ivcwsmentioning

confidence: 99%

Section: Insufficient Carbon Sourcementioning

confidence: 99%

“…In addition, nitrate is the predominant form of nitrogen pollutants in nonpoint drainage from fertile agricultural fields [5,6] and groundwater [7,8].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Chang¹,

Wu²,

Dai³

et al. 2013

Desalination and Water Treatment

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Influence of Vegetation Characteristics on Soil Denitrification in Shoreline Wetlands of the Danjiangkou Reservoir in China

Liu

Zhang

2011

CLEAN Soil Air Water

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Soil denitrification in reservoir shoreline wetlands is an important process for removing excess inorganic nitrogen from upland runoff and controlling eutrophication in aquatic ecosystems. As yet, little is known about the influence of vegetation characteristics on the soil denitrification potential in reservoir shoreline wetlands, although vegetation can affect both denitrifying bacteria and soil properties. In this study, we measured the spatial variability of denitrification enzyme activity (DEA) using acetylene block method in shoreline wetlands of the Danjiangkou Reservoir, a water source of the South-to-North Water Transfer Project in China. Results indicated that DEA ranged from 0.001 to 2.449 mg N (N 2 O) g À1 h À1 , with a mean of 0.384DEA varied significantly among five representative plant communities and the highest DEA (0.248-2.449 mg N (N 2 O) g À1 h À1 ) was observed in the Polygonum hydropiper community. Plant biomass and vegetation cover were significantly and positively related to DEA and together explained 44.2% of the total variance. These results suggest that vegetation characteristics should also be considered in assessing soil denitrification capacity and restoring shoreline wetlands for nitrogen pollution removal in the Danjiangkou Reservoir after dam heightening.

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Construction of River Channel‐wetland Networks for Controlling Water Pollution in the Pearl River Delta, China

Fan

Cui

Zhang

et al. 2012

CLEAN Soil Air Water

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Water pollution has been a serious problem with rapid urban development in the Pearl River Delta. In the paper, a river channel-wetland network (RCWN) was constructed to improve the situation of water pollution. At first, the assimilative capacity of each river was calculated for the main pollutants (biological oxygen demand and ammonia nitrogen selected) to investigate the water pollution degree; secondly, sites of wetlands used to alleviate the water pollution level of the heavily polluted rivers were identified according to original water bodies; then, the wetland areas connected with rivers were determined by analyzing wetland uptake rate, pollutant amount needed to reduce and the retention time. Based on the information above, the RCWN was constructed by connecting river channels with wetlands, here the wetlands and the confluences of river channels were used as the nodes, and river channels were used as the links between nodes. The results showed with the different retention time, the largest wetland areas required by the RCWN were also different for better improving the river water quality, and the wetland areas would be reduced with the retention time increased. The network composed of river channel and wetlands could efficiently control river water pollution. This study provides a useful tool for river water resources management based on the best available data and knowledge.Abbreviations: BOD 5 , biological oxygen demand; HWS, high water slack; LWS, low water slack; NH 4 þ -N, ammonia nitrogen; PRD, Pearl River Delta; RCWN, river channel-wetland network

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Effects of macrophytes and external carbon sources on nitrate removal from groundwater in constructed wetlands

Cited by 302 publications

References 13 publications

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Influence of Vegetation Characteristics on Soil Denitrification in Shoreline Wetlands of the Danjiangkou Reservoir in China

Construction of River Channel‐wetland Networks for Controlling Water Pollution in the Pearl River Delta, China

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