Interaction of phenanthrene with dissolved organic matter and its fractions from leachate of different landfill ages

Application of sequencing batch reactors (SBR) for treatment of leachate from old, stabilized landfills, could be still an economically viable solution, as far as nitrogen removal is concerned. Very low amounts of accesible organic compounds requires an unconventional approach to treatment technology. In this paper the authors proposed utilisation of polyurethane (PU) foam of various porosity as a biomass carrier, hydraulic retention time (HRT) extended to 2 days and temperature elevated to 37°C, to stimulate simultaneous nitrification and denitrification (SND). The porosity of PU carriers had no effect on the efficiency of organic compounds removal, whilst the ammonium nitrogen (N-NH 4 þ ) removal efficiency was highest in the reactor (SBR2) equipped with PU cuboidshape carriers of 30 pores per inch (ppi), reaching 77.6%. In the reactor SBR3 filled with 15 ppi foam, the N-NH 4 þ removal efficiency was much lower (54.2%), but still better than observed in reference reactor, SBR1, operated with suspended activated sludge only (46.3%). The average free ammonia concentration in the effluents ranged from 140.18 to 347.98 mg/L at pH 9.6, depending on the reactor. Neither nitrites nor nitrates were found in the effluents, and the kinetics of N-NH 4 þ removal proceeded according to the first-order reaction.

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“…). It follows from the review of available literature that this is the composition typical for a landfill in its stabilized phase .…”

Section: Resultsmentioning

confidence: 99%

Biological Treatment of Landfill Leachate at Elevated Temperature in the Presence of Polyurethane Foam of Various Porosity

Koc-Jurczyk

Jurczyk

2016

CLEAN Soil Air Water

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“…Compared with other SOM materials, Yang et al (2011) determined that the ranges of K DOC values between phenanthrene and dissolved humic acids were between 1.3 × 10 4 and 2.5 × 10 4 L/kg. DOM of higher ages have a strong binding capacity with phenanthrene; its K OC value was 1.02 × 10 5 L/kg ( Xi et al, 2012 ). Our observed K A values were higher than those values reported.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Different Molecular Size Fractions of Glomalin-Related Soil Protein From Forest Soil and Their Interaction With Phenanthrene

et al. 2022

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As a natural organic compound secreted by arbuscular mycorrhizal fungi (AMF), glomalin-related soil protein (GRSP) is an important part in soil, affecting the bioavailability of polycyclic aromatic hydrocarbons (PAHs) in it. Previous research have demonstrated that GRSP could enhance the availability of PAHs in the soil and favor their accumulation in plant roots. However, a scarcity of research exists on the different molecular weights of GRSP interacting with PAHs due to their complexation and heterogeneity. In this research, the extracted GRSP in soil was divided into three molecular weight (Mw) fractions of GRSP (<3,000, 3,000–10,000, and >10,000 Da), whose characteristics and binding capacity of PAHs were conducted by using UV–visible absorption, quenching fluorometry and, Fourier transform infrared spectroscopy. The results showed that the GRSP was composed of abundant compounds, it has a wide distribution of molecular weight, and the >10,000 Da Mw fraction was dominant. For three Mw fractions of GRSP, they have some difference in spectral features, for example, the >10,000 Da fraction showed higher dissolved organic carbon (DOC) contents, more phenolic hydroxyl groups, and stronger UV adsorption capacity than the low and middle Mw fractions. In addition, the interaction between GRSP and phenanthrene is related to the characteristics of the Mw fractions, especially the phenolic hydroxyl group, which has a significantly positive correlation with a binding coefficient of KA (k = 0.992, p < 0.01). Simultaneously, hydrophobic, NH-π, and H-bound also played roles in the complexation of phenanthrene with GRSP. These findings suggested that different GRSPMw fractions could influence the fate, availability, and toxicity of PAHs in soil by their interaction.

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Effect of pH on binding of pyrene to hydrophobic fractions of dissolved organic matter (DOM) isolated from lake water

Bai

Wang

2016

Acta Geochim

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Interaction of phenanthrene with dissolved organic matter and its fractions from leachate of different landfill ages

Cited by 6 publications

References 34 publications

Biological Treatment of Landfill Leachate at Elevated Temperature in the Presence of Polyurethane Foam of Various Porosity

Biological Treatment of Landfill Leachate at Elevated Temperature in the Presence of Polyurethane Foam of Various Porosity

Characterization of Different Molecular Size Fractions of Glomalin-Related Soil Protein From Forest Soil and Their Interaction With Phenanthrene

Effect of pH on binding of pyrene to hydrophobic fractions of dissolved organic matter (DOM) isolated from lake water

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