Comparison of changes in selected polycyclic aromatic hydrocarbons concentrations during the composting and anaerobic digestion processes of municipal waste and sewage sludge mixtures

2014 ◽  
Vol 70 (10) ◽  
pp. 1617-1624 ◽  
Author(s):  
Izabela Siebielska
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Aromatic Hydrocarbons ◽  
Degradation Kinetics ◽  
Municipal Waste ◽  
Gas Chromatography Mass Spectrometry ◽  
Organic Fraction ◽  
Important Conclusion ◽  
Polycyclic Aromatic

Changes in naphthalene (Naph), phenanthrene (Phe), pyrene (Pyr), benzo(a)pyrene (BaP) and benzo(ghi)perylene (BgP) concentrations in a mixture of sewage sludge and the organic fraction of municipal waste were determined during composting and anaerobic digestion. The processes were carried out on a laboratory scale. The selected polycyclic aromatic hydrocarbons (PAHs) were analyzed in the samples using gas chromatography-mass spectrometry. The rates at which the PAHs concentrations decreased were evaluated during composting and anaerobic digestion. The selected PAHs degradation kinetics were compared during these processes. The most important conclusion of this work is that composting is much more effective than anaerobic digestion in removing five PAHs from a mixture of sewage sludge and the organic fraction of municipal waste.

Organic Contaminants in Canadian Municipal Sewage Sludge. Part II. Persistent Chlorinated Compounds and Polycyclic Aromatic Hydrocarbons

2006 ◽  
Vol 41 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Jagmohan Kohli ◽  
Hing-Biu Lee ◽  
Thomas E. Peart
Keyword(s):  
Gas Chromatography ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Sewage Sludge ◽  
Aromatic Hydrocarbons ◽  
Negative Ion ◽  
Gas Chromatography Mass Spectrometry ◽  
Municipal Sewage Sludge ◽  
Electron Capture Detection ◽  
Chlorinated Compounds ◽  
Polycyclic Aromatic

Abstract Thirty-five sewage sludge samples collected across Canada were analyzed for 18 polycyclic aromatic hydrocarbons (PAHs), 17 congeners of polychlorinated biphenyls (PCBs) and seven selected chlorinated compounds. Samples were prepared by accelerated solvent extraction and standard column cleanup procedures using silica gel and Florisil. Gas chromatography with electron-capture detection was used for the determination of PCBs. Gas chromatography/mass spectrometry with electron-impact ionization and methane negative ion chemical ionization were used for the detection of PAHs and the chlorinated compounds, respectively. PAHs were detected in nearly all samples, with a total concentration ranging from 0.14 to 209 µg/g (median 3.65 µg/g) on a dry weight basis. Phenanthrene, fluoranthene and pyrene were present at the highest concentrations, with medians ranging from 0.56 to 0.58 µg/g. PCBs were also found in all samples, with a total PCB concentration ranging from 31 to 323 ng/g. The most abundant PCBs (congeners 52, 101 and 110) had median concentrations of 12 ng/g or above. While pentachlorobenzene and hexachlorobenzene were observed in all sludge, at low ng/g levels, no other less chlorinated benzenes have been detected in the same samples. Octachlorostyrene was only found in the Ontario samples, with concentrations ranging from 0.3 to 11.5 ng/g (median 0.9 ng/g). For the chlorinated insecticides, only p,p'-DDE, α- and γ-chlordane were found on a more regular basis, with median concentrations of 12.0, 0.4 and 0.8 ng/g, respectively. These results suggest that the above toxic chemicals are occurring in Canadian sewage samples and are persistent enough to survive the existing sewage treatment processes.

Fate of polycyclic aromatic hydrocarbons during composting of activated sewage sludge with green waste

2008 ◽  
Vol 99 (18) ◽  
pp. 8819-8823 ◽  
Author(s):  
M. Hafidi ◽  
S. Amir ◽  
A. Jouraiphy ◽  
P. Winterton ◽  
M. El Gharous ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Sewage Sludge ◽  
Aromatic Hydrocarbons ◽  
Green Waste ◽  
Polycyclic Aromatic ◽  
Activated Sewage Sludge
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