Nitrogen removal from nitrate-laden wastewater by integrated vertical-flow constructed wetland systems

Chang, Junjun; Wu, Suqing; Dai, Yanran; Liang, Wei; Wu, Zhenbin

doi:10.1016/j.ecoleng.2013.06.039

Cited by 75 publications

(30 citation statements)

References 54 publications

(102 reference statements)

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“…[3,6,11,15] As compared with COD, poor TN removal capacity was attained in the IVCWs due to the detrimental environmental conditions such as severely insufficient oxygen for nitrification of DW or carbon source shortage for denitrification of NW. In addition, longer retention time was required for efficient removal of N in comparison to COD.…”

Section: ¡1mentioning

confidence: 99%

“…) was obtained when treating low LR of NW with an average The data for NW during operation period 2 was cited from Chang et al [15] , probably due to the organic materials in the simulated wastewater being easily degradable and utilized adequately for denitrification. And, it might also suggest the superiority of IVCW in elimination of low level of organic substance under this operational condition.…”

Section: ¡1mentioning

confidence: 99%

“…DW: domestic wastewater; NW: nitrified wastewater. The data of TN removal for low LR of NW was cited from Chang et al [15] *The correlation is statistically significant. **The correlation is statistically highly significant.…”

Section: ¡1mentioning

confidence: 99%

“…[11,12] Integrated vertical-flow constructed wetland (IVCW), combining a down-flow cell and another up-flow one in series, has been extensively applied in ecological engineering projects in China for treating various wastewater sources, in which domestic and nitrified wastewater take a considerable proportion, due to its compact structure yielding relatively small land area occupation, and effective pollutant removal under suitable operations. [13][14][15] However, the knowledge on the differences of its organics and nitrogen removal capacities dosing domestic and nitrified wastewater based on a relatively long-term experience is limited to date, which is urgently desired for its better application. Moreover, the influences of important environmental and operational factors on the treatment performance of IVCWs fed with the two types of wastewater may vary greatly and interact, therefore relevant assessment and comparison were also required.…”

Section: Introductionmentioning

confidence: 99%

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Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment

Chang

Liang

et al. 2015

Journal of Environmental Science and Health, Part A

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Two groups of integrated vertical-flow constructed wetland (IVCW) microcosms were established for treating two types of representative wastewater: domestic and nitrified wastewater under two loading rates (LRs) over about two years. Their removal capacities of organic substance and nitrogen as well as the effects of loading rate (LR), outflow temperature and dissolved oxygen (DO) concentration were investigated and compared. Efficient chemical oxygen demand (COD) eliminations were achieved by the IVCWs, with the mass removal rates increasing linearly with the increasing LRs strongly, achieving average value of 56.07 g m ¡2 d¡1 at the highest loading rate. Nevertheless, the effluent COD concentrations also increased, with the average value exceeding Class I A discharge standard (< 50 mg L ¡1 ) for municipal wastewater treatment plants in China at the highest loading rate. Greater total nitrogen (TN) mass removal rates but lower efficiencies were obtained at the high LR for both types of wastewater, and better removal was achieved for nitrified wastewater (NW) in comparison to domestic wastewater (DW), probably due to the prevailing anoxic conditions inside the IVCW beds restricted nitrification process of DW. The influences of LR, temperature and DO on COD removal were slight, but all remarkable on TN reduction. As compared to DO, temperature was more crucial for nitrogen removal, and the temperature dependence coefficient for TN removal of low LR of NW was significantly greater than others.

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Section: ¡1mentioning

confidence: 99%

Section: ¡1mentioning

confidence: 99%

Section: ¡1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment

Chang

Liang

et al. 2015

Journal of Environmental Science and Health, Part A

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“…Integrated vertical-flow constructed wetlands (IVCWs) have been successfully applied to treat domestic and secondary wastewater [16][17][18][19]. It is expected that the microbial parameters mentioned above can be markedly affected by wastewater type due to different constituents.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Responses of microbial abundance and enzyme activity in integrated vertical-flow constructed wetlands for domestic and secondary wastewater

Chang

Liang

et al. 2014

Desalination and Water Treatment

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A B S T R A C TAlthough micro-organisms play a significant role in pollutant removal in constructed wetlands, little is known on the effect of wastewater-quality properties on microbial characteristics. In this study, two groups of integrated vertical-flow constructed wetland microcosms were applied to treat synthetic domestic wastewater and synthetic secondary effluent. The effects of wastewater-quality properties on microbial features were assessed. Results showed that higher values of microbial indicators were observed in the systems with domestic wastewater and in down-flow cells. Redundancy analysis revealed that organic matter concentration and temperature were two critical determinants influencing the microbial features.

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Urea‐Based Fuel Cells and Electrocatalysts for Urea Oxidation

2016

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Urea is a new member of hydrogen‐storage materials for low‐temperature fuel cells. It avoids issues of toxicity and safety compared to NH3 and hydrazine. The main limitation of urea‐based fuel cells is their relatively low power densities due to the sluggish anode reactions. Rapid advances in nanocatalysts used for urea electro‐oxidation have been achieved in lowering overpotential and improving activity. Urine, as a natural resource of urea, is also an environmental pollutant. Most technologies of treating urine with self‐generation electricity are based on microbial fuel cells. However, microbes are only able to utilize the organic substrates rather than urea in urine. Chemical fuel cells in contrast directly oxidize urea to nitrogen gas, removing it from urine. Thus, urea‐based fuel cells have been used as an alternative method to treat urine. In this Minireview, the progress in urea‐based fuel cells and electrocatalysts for urea oxidation is reviewed.

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Nitrogen removal from nitrate-laden wastewater by integrated vertical-flow constructed wetland systems

Cited by 75 publications

References 54 publications

Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment

Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment

Responses of microbial abundance and enzyme activity in integrated vertical-flow constructed wetlands for domestic and secondary wastewater

Urea‐Based Fuel Cells and Electrocatalysts for Urea Oxidation

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