Characterization and removal of dissolved organic matter in a vertical flow constructed wetland

Du, Xiaoli; Xu, Zuxin; Li, Junqi; Zheng, Lei

doi:10.1016/j.ecoleng.2014.09.098

Cited by 38 publications

(8 citation statements)

References 36 publications

(44 reference statements)

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“…Similarly to the results found in this work, protein and tryptophan-like substances, which represent the most biodegradable fraction of DOM, revealed the highest removal, whereas lower elimination rates were observed for fulvic and humiclike fluorescence components [44,50]. Studies on DOM removal by fluorescence spectroscopy in conventional WWTPs have also reported the highest removal (40-99%) for fluorescing substances in the region of EEM with emission < 380 nm (i.e., protein, tryptophan-like and tyrosine-like fluorescence) and the observed removal rates were similar under aerobic or anoxic/anaerobic conditions [16,22,49,[51][52][53].…”

Section: Fluorescent Organic Matter Removal In Constructed Wetlandssupporting

confidence: 67%

“…Studies on the removal of fluorescent organic matter in CW systems are very limited and related to investigations of DOM removal in five CW beds in series and alternating biological ponds and plant gravel beds, and in a pilot-scale UVF unit [44,50]. Similarly to the results found in this work, protein and tryptophan-like substances, which represent the most biodegradable fraction of DOM, revealed the highest removal, whereas lower elimination rates were observed for fulvic and humiclike fluorescence components [44,50].…”

Section: Fluorescent Organic Matter Removal In Constructed Wetlandsmentioning

confidence: 99%

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Removal of organic carbon, nitrogen, emerging contaminants and fluorescing organic matter in different constructed wetland configurations

Sgroi

Pelissari

Roccaro

et al. 2018

Chemical Engineering Journal

121

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The elimination of organic carbon, nitrogen, five emerging organic contaminants (EOCs) and fluorescence signature was evaluated in two treatment lines comprising different constructed wetland (CW) configurations: (i) partially saturated vertical subsurface flow (SVF) wetland (treatment line 1) and (ii) unsaturated vertical subsurface flow (UVF), horizontal subsurface flow (HF) and free water surface (FWS) wetlands in series (treatment line 2). Results showed important differences between the different CW configurations. The highest removal of BOD5 (81%), COD (67%), TOC (72%) and fluorescing organic matter were observed in the UVF wetland, whereas the HF and FWS wetlands were the most efficient units for total nitrogen removal (60 and 69%, respectively).The SVF wetland showed a greater performance in the reduction of total nitrogen than the UVF bed (52 vs 35%). In addition, the SVF wetland exhibited a higher removal of the EOCs caffeine (95 vs 90%), trimethoprim (99 vs 87%) and sulfamethoxazole (64 vs 4%), as opposed to DEET (34 vs 63%), whose removal was superior in the UVF unit. Sucralose was negligibly removed in all the CWs. PARAFAC analysis of fluorescence measurements revealed that the proteinaceous tryptophan-like fluorescent component was the most highly removed one in all the investigated CWs (>28%) and, particularly, in the UVF wetland (66%), whereas humic and fulvic-like components resulted recalcitrant to decomposition. Increases of fluorescence intensities were often observed for fulvic-like substances in CWs operating with saturation of the bed, and these were particularly relevant in the SVF unit. Finally, important correlations (r>0.7) between the tryptophanlike fluorescent component and the water quality parameters COD and BOD5 suggest fluorescence spectroscopy as an useful monitoring tool for water treatment efficiency in CW systems.

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Section: Fluorescent Organic Matter Removal In Constructed Wetlandssupporting

confidence: 67%

Section: Fluorescent Organic Matter Removal In Constructed Wetlandsmentioning

confidence: 99%

Removal of organic carbon, nitrogen, emerging contaminants and fluorescing organic matter in different constructed wetland configurations

Sgroi

Pelissari

Roccaro

et al. 2018

Chemical Engineering Journal

121

View full text Add to dashboard Cite

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“…It was found that polyphenolic compounds in water are increased by DOM from roots and leaves, and hydrophilic organic matter is more biodegradable than hydrophobic organic matter [6]. UF fractionation was used to study DOM in a vertical sub-surface constructed system, and it was found that large organic matter (> 10 kDa) was more biodegradable, and hydrophobic organics rather than hydrophilic organics were preferentially removed, which were fractionated by XAD resin [7]. However, XAD resin and UF have limitations.…”

Section: Introductionmentioning

confidence: 99%

Transformation of dissolved organic matter in a constructed wetland: A molecular-level composition analysis using pyrolysis-gas chromatography mass spectrometry

Park

Choi

Cho

et al. 2018

Environmental Engineering Research

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This study investigated the transformation of dissolved organic matter (DOM) in a free-water surface flow constructed wetland. Pyrolysis gas chromatography-mass spectrometry (Py-GC/MS) coupled with preparative high-performance liquid chromatography (prep-HPLC) was used to analyze the compositions of biopolymers (polysaccharides, amino sugars, proteins, polyhydroxy aromatics, lipids and lignin) in DOM according to the molecular size at three sampling points of the water flow: inflow, midflow, and outflow. The prep-HPLC results verified the decomposition of DOM through the decrease in the number of peaks from three to one in the chromatograms of the sampling points. The Py-GC/MS results for the degradable peaks indicated that biopolymers relating to polysaccharides and proteins gradually biodegraded with the water flow. On the other hand, the recalcitrant organic fraction (the remaining peak) in the outflow showed a relatively high concentration of aromatic compounds. Therefore, the ecological processes in the constructed wetland caused DOM to become more aromatic and homogeneous. This indicated that the constructed wetland can be an effective buffer area for releasing biochemically stable DOM, which has less influence on biological water quality indicators, e.g., biochemical oxygen demand, into an aquatic ecosystem.

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“…Most DOM, such as volatile organic acid, is assimilated by heterotrophic microorganisms in the biological treatment process [18]. Microbes were the most critical factor for organic matter degradation [35,36]. It is clear, therefore, that microbially derived DOM may be produced by anaerobic digestion.…”

Section: Characterization Of Effluent Dommentioning

confidence: 99%

Characterization of Dissolved Organic Matter from Effluents in a Dry Anaerobic Digestion Process Using Spectroscopic Techniques and Multivariate Statistical Analysis

Guo

Chen

et al. 2016

Waste Biomass Valor

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Dissolved organic matter (DOM) collected from a garage-type dry fermentation system was investigated using UV-Vis absorption and fluorescence spectroscopy. Spectral parameters A 253/203 , biological index and fluorescence index were used to assess the structural characteristics and sources of effluent DOM. The results showed that aromatic rings highly substituted with hydroxyl, carbonyl, ester and carboxylic groups were obtained in the aerobic decomposition stage, and microbially derived organic matter dominated in the dry anaerobic digestion process, suggesting that the hydrolysis of organic macromolecules (lignin) in the aerobic decomposition resulted in the formation of water-soluble intermediates which can be easily assimilated and metabolized by microbial cells in dry anaerobic digestion process. PARAFAC of the excitation-emission matrix spectra revealed five fluorescent components occurring in effluent DOM: four humic-like components (C1-C4) and one protein-like component (C5). The F max values of components 1, 2, 3 and 5 showed large fluctuation than that of component C4, suggested the formation and degradation of these components. Component C4, with high aromatic content and higher degree of humification, was more difficult to be utilized and degraded by microorganisms than other components. The PAR-AFAC-PCA displayed three PCA factors (factors 1, 2 and 3), which accounted for 34.51, 34.20 and 31.11 %, respectively, of the variance in fluorescent components. Humic-like component C4 showed positive factor 1 loadings. Factor 2 was mainly explained by the tryptophan-like component C5. The humic-like components 1, 2 and 3 concurrently showed a relatively high factor 3 loading. The PARAFAC-PCA in this study could separate the characteristics of the DOM fluorescent component namely the source strength of the humic-like components versus the contributions of protein-like components in the total fluorescence analyses.

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Characterization and removal of dissolved organic matter in a vertical flow constructed wetland

Cited by 38 publications

References 36 publications

Removal of organic carbon, nitrogen, emerging contaminants and fluorescing organic matter in different constructed wetland configurations

Removal of organic carbon, nitrogen, emerging contaminants and fluorescing organic matter in different constructed wetland configurations

Transformation of dissolved organic matter in a constructed wetland: A molecular-level composition analysis using pyrolysis-gas chromatography mass spectrometry

Characterization of Dissolved Organic Matter from Effluents in a Dry Anaerobic Digestion Process Using Spectroscopic Techniques and Multivariate Statistical Analysis

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