Identification and significance of sterols in MSW landfill leachate

Zhang, Caixiang; Wang, Yanxin; Qi, Shihua

doi:10.1016/j.jchromb.2008.08.014

Cited by 17 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This list of sterol compounds is exhaustive and comparable to other studies in terms of number of sterols analyzed (Fernandez et al 2007;Leeming et al 1996;Nash et al 2005;Zhang et al 2008 Bull et al 2002;Fattore et al 1996;Chan et al 1998;Grimalt et al 1990;Carreira et al 2004;Froehner et al 2009;Marvin et al 2001;Patton and Reeves 1999 . Although the concentration of sterol compounds differed between influents and effluents, the order of abundance was basically the same.…”

Section: Gcms Methods For Sterol Detectionsupporting

confidence: 66%

“…Source tracking methods to identify sources of fecal contamination generally target either chemical or microbial indicators (Gilpin et al 2003;Hagedorn and Weisberg 2009;Leeming et al 1997;Tyagi et al 2009). Individual fecal sterols and various sterol ratios have been utilized for some time as chemical markers for sewage and agricultural contamination (de Castro Martins et al 2007;Leeming et al 1996;Zhang et al 2008). Compared to bacteria, which are highly affected by natural factors such as temperature, salinity, and sunlight (Chou and Liu 2004;Devane et al 2006), sterols are more resistant to environmental stress, which make them more suitable as indicators (Leeming et al 1997;Tyagi et al 2009 and references within).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Sewage Treatment Plants Efficiencies in Removal of Sterols and Sterol Ratios as Indicators of Fecal Contamination Sources

Furtula

Liu

Chambers

et al. 2011

Water Air Soil Pollut

View full text Add to dashboard Cite

This study assessed the efficiency of sewage treatment plants (STPs) in removing sterols based on chemical analyses of both influents and effluents. Samples from 3s and three tertiary plants were collected and analyzed by gas chromatography mass spectrometry for 23 individual sterols including mestranol, norethindrone, equol, estrone, equilin, norgestrel, 17α-ethinylestradiol, 17α-estradiol, 17β-24-ethylcoprostanol. The percentage of sterols remaining in effluent samples (compared to influent samples) ranged from 0% to 80% and varied among sterol compounds and with STP location and treatment type.Differences in the efficiency of sterol removal for secondary and tertiary STPs were statistically significant. Although the concentration of sterol compounds differed between influents and effluents, sterol abundances remained the same. The most abundant sterol detected was cholesterol, followed by the fecal sterol coprostanol, and the plant sterols 24-ethylcoprostanol and β-sitosterol. For three STPs, the hormone estrone was detected in effluents at concentrations of 0.03-0.05 μg L −1 . Ten sterol ratios specific for human fecal contamination and eight sterol ratios for differentiating among multiple sources of fecal contamination were calculated and showed that 12 ratios for influent and nine ratios for effluent were successful for human fecal source tracking. Based on sterol ratio values in this study, new criteria for identification of human fecal contamination were suggested.

show abstract

Section: Gcms Methods For Sterol Detectionsupporting

confidence: 66%

mentioning

confidence: 99%

Sewage Treatment Plants Efficiencies in Removal of Sterols and Sterol Ratios as Indicators of Fecal Contamination Sources

Furtula

Liu

Chambers

et al. 2011

Water Air Soil Pollut

View full text Add to dashboard Cite

show abstract

“…There is a poor understanding of the fate and transport of allochthonous DOM in aquatic systems (Salonen et al, 2012). Allochthonous NOM is susceptible to photochemical reactions (Sulzberger et al, 2009) and is present in high concentrations in LOM (Zhang et al, 2008).…”

Section: Photochemical Reactions With Dissolved Organic Mattermentioning

confidence: 99%

Treatment of leachate organic matter through sunlight driven processes

et al. 2019

View full text Add to dashboard Cite

Leachate from mature, stabilized landfills is recalcitrant in nature resulting from high concentrations of humic substances, such as humic acids and complex poorly defined organic matter. This research focused on the behavior and fate of leachate organic matter (LOM) in aquatic sunlit systems to address the extent and mechanisms of LOM photodegradation by exposing leachate to natural sunlight in central Florida for a period of 90 days. Transformation processes were measured using ultraviolet-visible (UV-Vis) spectroscopy, fluorescence excitation-emission matrix spectroscopy (EEMs), size-exclusion chromatography (SEC), and chemical oxygen demand (COD) over the test period. Results of the study suggest that photolytic, and in some cases biological, reactions were responsible for the treatment of LOM shown by transformation of high molecular weight recalcitrant material to lower molecular weight material.

show abstract

“…Then, the solution was extracted using the extraction method reported in our previous work (Zhang et al 2008). In brief, The ODS-C18 cartridges (500 mg×3 mL, Supelco) were conditioned with 6 mL hexane, 6 mL DCM, and 6 mL methanol, followed by 5×6 mL pure water.…”

Section: Spe-gc/ms Analysis Of Photocatalytic Samplesmentioning

confidence: 99%

UV-TiO2 Photocatalytic Degradation of Landfill Leachate

Chen-zhong

Wang

Zhang

et al. 2010

Water Air Soil Pollut

View full text Add to dashboard Cite

Mature landfill leachate contains some macromolecular organic substances that are resistant to biodegradation. The photocatalytic process helps to enhance biodegradability of landfill leachate. Batch experiments were employed to determine the optimum conditions for removal of organic matter by UVTiO 2 photocatalysis. Under optimum conditions, the removal of chemical oxygen demand (COD), dissolved organic carbon (DOC), biological oxygen demand (BOD), and color was determined. Moreover, gas chromatography coupled with mass spectrometry (GC/MS) was used to analyze the organic matter in the treated leachate before and after treatment by the photocatalysis. The experimental results indicated that the removal of COD, DOC, and color by UV-TiO 2 photocatalysis could reach above 60%, 70% and 97%, respectively. Under optimal conditions, the ratio of biological oxygen demand (BOD)/chemical oxygen demand (COD) was elevated from 0.09 to 0.39, representing substantial improvement in biodegradability. GC/MS analysis revealed that 37 out of 72 kinds of organic pollutants in the leachate remained after 72 h treatment. Esters were produced during photocatalytic process and ketones, hydrocarbons, aromatic hydrocarbons, hydroxybenzenes, and acids were easier to be degraded during photocatalytic oxidation processes. The UV-TiO 2 photocatalysis systems proposed may be a cost-effective approach for pre-treatment of landfill leachate.

show abstract

Identification and significance of sterols in MSW landfill leachate

Cited by 17 publications

References 40 publications

Sewage Treatment Plants Efficiencies in Removal of Sterols and Sterol Ratios as Indicators of Fecal Contamination Sources

Sewage Treatment Plants Efficiencies in Removal of Sterols and Sterol Ratios as Indicators of Fecal Contamination Sources

Treatment of leachate organic matter through sunlight driven processes

UV-TiO2 Photocatalytic Degradation of Landfill Leachate

Contact Info

Product

Resources

About