Characterization and comparison of hydrophobic neutral and hydrophobic acid dissolved organic carbon isolated from three municipal landfill leachates

Nanny, Mark A.; Ratasuk, Nopawan

doi:10.1016/s0043-1354(01)00359-1

Cited by 117 publications

(57 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As landfill ages and humidification process proceeds, HS percentage in leachate increases [28,31]. However, Nanny et al observed an opposite change over time [29].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Monitoring transitory profiles of leachate humic substances in landfill aeration reactors in mesophilic and thermophilic conditions

Tong

Yin

et al. 2015

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…As landfill ages and humidification process proceeds, HS percentage in leachate increases [28,31]. However, Nanny et al observed an opposite change over time [29].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, HS are abundant in the leachate representing up to 90% of DOC, while the HAs account for 0.4% -44% and FAs comprise 23% -56 % [28][29][30]. As landfill ages and humidification process proceeds, HS percentage in leachate increases [28,31].…”

Section: Introductionmentioning

confidence: 99%

Monitoring transitory profiles of leachate humic substances in landfill aeration reactors in mesophilic and thermophilic conditions

Tong

Yin

et al. 2015

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…Glutaric and adipic acids are produced during methanogenic fermentation of aromatic substrates that form phenol or benzoate as an intermediate (Nanny and Ratasuk 2002). Fatty acids, as methyl ester, were observed in minor portion among thermochemolysis products and they consist of n-C 14 and n-C 16 .…”

Section: Tetramethylammonium Hydroxide Thermochemolysismentioning

confidence: 99%

Study of water-extractable fractions from South Moravian lignite

et al. 2014

View full text Add to dashboard Cite

International audienceLignite can be applied directly in natural form on agricultural fields as a soil conditioner. However, there is little information on leaching of risky compounds by its interaction with water. South Moravian lignite was therefore extracted with water at 25 A degrees C and 2.3 % of water-soluble fractions were obtained from lignite corresponding to 0.3 % of total organic carbon. All ten fractions form aromatic and aliphatic structures with oxygen-containing functional groups such as carboxyl groups, alcohols, ethers, esters, can be characterized as fulvic-like and humic-like substances. According to the XPS spectra, the fractions contain two nitrogen forms, one of which is ascribed to pyrroles and the second is related to protonated amines or quaternary nitrogen. Analysis at molecular level showed that the fractions contain compounds such as benzene carboxylic acids and their derivatives, small aliphatic diacids, fatty acids and polyols. Most of the identified molecules reflect clearly the presence of microbial remains in the lignite structure since microbial activity during coalification is well known. The differences between the individual fractions are negligible, especially after 21 days of extraction. From environmental point of view, it seems that the identified compounds do not represent a toxic risk

show abstract

“…rainfall, humidity and evaporation rate), • the age of the landfill, • biochemical and physical changes occurring in the waste [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Organic Fraction of Pretreated Leachate from Old Landfill after Sonication Exposure

Kwarciak‐Kozłowska

Sławik-Dembiczak

2016

Eng. Prot. Environ.

View full text Add to dashboard Cite

Charakterystyka frakcji organicznej odcieków ze starego składowiska po zastosowaniu sonifikacjiCollection of municipal waste in landfills, even properly designed and operated, is an important issue in environmental engineering. These are formed by the infiltration of rainfall through the waste bed and eluting with the organic and inorganic compounds, often toxic nature. So far, over 200, have been identified which are organic substances leachate contamination, as many as 35 belongs to the so-called "priority pollutants". By the decrease in the concentration of organic compounds in the leachate decrease the value of biological and chemical oxygen demand which is dictated by stabilization of landfill as lengthening the time of its life. However, the indicator BOD5 decreases faster as compared to COD therefore BOD5/COD ratio is reduced to as low as 0.06. The leachate produced in mature landfills appears to be the presence of significant amounts of humic acid with very stable structure difficult to breach by bacteria. It was assumed that ultrasonic waves induce change in the structure of organic compounds and contribute to the acceleration of the biodegradability, among other substances in the effluents refractive thereby improve the efficiency of the biological purification processes. For sonification leachate used ultrasonic disintegrator type vibro goal Sonics (40 kHz). The range of vibration amplitude was varied in the range from 25 to 123 µm and exposure time (sonification of leachate) from 60 to 720 seconds. Also the measuring of the size of the energy produced during sonication sonochemical leachate was made. It was found, inter alia, that the sonification process of effluents clearly influenced the formation and release of aliphatic compounds. The -CH2 and -CH3 groups can be released from the humic compounds or aromatic combinations. It was also observed the formation of substantial amounts of compounds with the functional hydroxyl group, which might be derived from alcohols and carboxylic acids. These changes suggested a breach of the chemical structure of organic compounds contained in the leachate, so that, the chemical structure of the formed compounds was more susceptible to biodegradation. The study also determined the effect of ultrasonic field on the evolution of the BOD5 treated leachates and BOD5/COD ratio. The BOD5 sharp increase was observed at the time of sonification of leachate in the range of 60 to 300 s in the whole studied range of amplitudes. This suggests that by the action of the ultrasonic field generated in the effluents of chemical compounds had greater biodegradability.The process confirmed by the change in the ratio of BOD5/COD. The highest value of BOD5 indicator (460 mg/dm 3 ) was at the time of subjecting the leachate impact of ultrasound using amplitude equal to the size of 25 µm and for the time of sonification equal 300 s. In this case the BOD5/COD factor increased to 0.12, and it was about 26% higher as compared to the value of this indicator for leachate no-sonificated (0.08...

show abstract

Characterization and comparison of hydrophobic neutral and hydrophobic acid dissolved organic carbon isolated from three municipal landfill leachates

Cited by 117 publications

References 48 publications

Monitoring transitory profiles of leachate humic substances in landfill aeration reactors in mesophilic and thermophilic conditions

Monitoring transitory profiles of leachate humic substances in landfill aeration reactors in mesophilic and thermophilic conditions

Study of water-extractable fractions from South Moravian lignite

Characterization of the Organic Fraction of Pretreated Leachate from Old Landfill after Sonication Exposure

Contact Info

Product

Resources

About