Highly efficient removal of nitrogen and phosphorus in an electrolysis-integrated horizontal subsurface-flow constructed wetland amended with biochar

Gao, Yan; Wen, Zhang; Gao, Bin; Jia, Wen; Miao, Ai-Jun; Xiao, Lin; Yang, Liuyan

doi:10.1016/j.watres.2018.04.007

Cited by 98 publications

(40 citation statements)

References 36 publications

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“…The presence of iron oxide is known to aid the adsorption phosphorous on the surface of materials (Kadlec and Wallace, 2009). PO4-P removal in PK-A systems could be comparable with removal efficiency reported for CW-MFC amended with dewatered alum sludge (94%) (Xu et al, 2017), or with the removal efficiency of 74% reached in a electrolysis-based horizontal flow constructed wetland reported by Gao et al (2018).…”

Section: Effluent Water Quality and Correlation With Microbial Metabosupporting

confidence: 77%

Microbial Community Function in Electroactive Biofilm-based Constructed Wetlands

Ramírez-Vargas

Arias

Zhang

et al. 2018

Preprint

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<p><strong>Abstract.</strong> The performance enhancement of constructed wetlands can be achieved through the coupling with microbial electrochemical technologies (MET). MET is a setup designed to mimic metabolic electrons exchange with insoluble donors and acceptors with the aid of electroactive bacteria and external electrical circuits. An alternative MET that dispenses of electrodes and circuits but uses an electro-conductive biofilter is called Microbial Electrochemical-based Constructed Wetland (METland). Previously it has been demonstrated that a METland has higher biodegradation rates than horizontal flow constructed wetlands, however given its novelty there are still uncertainties related to the removal of pollutants, including their microbial activity. The genetic characterization of microbial communities of a METland is desirable, but is time and resource consuming, then a characterization alternative could be based on functional analysis of the microbial communities. Community-level physiological profile (CLPP) is a useful method to evaluate the functional diversity of microbial communities based on the carbon source utilization pattern (CSUP). Therefore, this study was focused on the microbial characterization of laboratory scale METland based on CLPP analysis. The study included the characterization of microbial communities attached to two carbon-based electro-conductive materials (calcined petroleum coke from crushed electrodes – PK-A; calcined petroleum coke with low sulphur and nitrogen content – PK-LSN), in planted and non-planted set-ups. Variations on the metabolic activity of tested systems were identified and it seems to be related to the characteristics of the material, rather than the presence/absence of plants. In general, CSUP show differences along flow pathway, as well as among the tested systems, being carbohydrates and carboxylic/acetic acids the most consumed carbon sources, followed by polymers, amides/amines and amino acids. Also, were established some correlations between the utilization of carbon sources and the removal of pollutants. The obtained results provide useful insight into the spatial dynamics of METland systems.</p>

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Section: Effluent Water Quality and Correlation With Microbial Metabosupporting

confidence: 77%

Microbial Community Function in Electroactive Biofilm-based Constructed Wetlands

Ramírez-Vargas

Arias

Zhang

et al. 2018

Preprint

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“…La eliminación del nitrógeno durante el tratamiento por humedales artificiales presenta procesos como volatilización de NH 3 , nitrificación, desnitrificación, fijación de N 2 , absorción de plantas y microbios, mineralización, reducción de nitrato a amonio, oxidación anaeróbica de amoniaco, fragmentación, adsorción, desorción, enterramiento, lixiviación, etcétera (Gao, Zhang, Gao, Jia, & Yang, 2018).…”

Section: Procesos Depurativosunclassified

Estado del arte: una revisión actual a los mecanismos que realizan los humedales artificiales para la remoción de nitrógeno y fósforo

Arteaga-Cortez

Nolasco

Valle-Paniagua

et al. 2019

Tecnol. cienc. agua

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El tratamiento de aguas residuales por medio de los humedales artificiales se utiliza como una tecnología verde que surge de la necesidad de replicar los beneficios ecosistémicos de los humedales naturales para tratar diversos afluentes de aguas residuales. Este trabajo presenta una revisión bibliográfica acerca de los diferentes tipos de humedales artificiales y sus procesos depurativos. Si bien existen muchos estudios sobre humedales artificiales, es necesario realizar una sinergia de dicha información. No obstante, aunque los humedales artificiales son una frecuente práctica de gestión para la mitigación de contaminantes provenientes de escorrentía agrícola y municipal, en muchos países faltan estudios comparativos sobre su eficiencia depurativa y el mantenimiento a los mismos, así como profundizar en la investigación de sustratos alternativos y detallar medidas preventivas para la evitar la colmatación del sustrato.

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“…The effects of temperature on inorganic and organic phosphate adsorption by the Fe-Mn plaques were investigated by calculating the Gibbs free energy (∆G 0 ), enthalpy change (∆H 0 ), and entropy change (∆S 0 ) using Equations (5)- (7).…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

“…In such wetland systems, phosphorus is removed by plant uptake, media adsorption, and microorganism assimilation [4][5][6]. Media adsorption is usually limited because much of the solid matter is inert and has a poor adsorption capacity [7,8]. Assimilation by microorganisms contributes little to the removal of total phosphorus because the phosphorus will be released back to the water once the microorganisms die.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of Inorganic and Organic Phosphate by Iron Manganese Plaques on Reed Roots in Wetlands

Zhu

Gao

et al. 2018

Sustainability

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Inorganic and organic phosphate adsorption by iron–manganese (Fe–Mn) plaques extracted from reed roots was investigated. Scanning electron microscopy indicated the roots had rough surfaces and fine particles attached. X-ray photoelectron spectra indicated that Fe and Mn in the Fe–Mn plaques were mainly in the +III and +IV oxidation states, respectively. The contact time, initial phosphate concentration, and temperature effects on inorganic and organic phosphate adsorption were investigated by performing batch tests. Pseudo-second-order model described inorganic and organic phosphate adsorption, indicating the chemisorption was the dominant adsorption process. Langmuir and Freundlich isotherm models were fitted to the equilibrium data, and the Langmuir model fitted best. The maximum inorganic and organic phosphate adsorption capacities at 298 K were 7.69 and 3.66 mg/g, respectively. The inorganic and organic phosphate adsorption processes were spontaneous and exothermic. The inorganic phosphate adsorption capacity was higher than the organic phosphate adsorption capacity, and the presence of organic phosphate did not negatively affect adsorption at inorganic to organic phosphate molar ratios between 1:1 and 3:1. Fourier-transform infrared spectra before and after adsorption showed abundant functional groups on Fe–Mn plaques and that phosphate was probably adsorbed via replacement of hydroxyl groups and inner-sphere surface complexation.

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Highly efficient removal of nitrogen and phosphorus in an electrolysis-integrated horizontal subsurface-flow constructed wetland amended with biochar

Cited by 98 publications

References 36 publications

Microbial Community Function in Electroactive Biofilm-based Constructed Wetlands

Microbial Community Function in Electroactive Biofilm-based Constructed Wetlands

Estado del arte: una revisión actual a los mecanismos que realizan los humedales artificiales para la remoción de nitrógeno y fósforo

Adsorption Behavior of Inorganic and Organic Phosphate by Iron Manganese Plaques on Reed Roots in Wetlands

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