Acetylene and Ethylene from Petroleum Hydrocarbons

Inhibition of methanogenesis by ethylene and other unsaturated hydrocarbons : (Methanogenic degradation; selective inhibition; sulfate reduction; ethylene; acetylene; aromatic hydrocarbons)

Ethylene (ethene) was found to inhibit methane formation in slurries from sewage sludge and sediment samples taken from freshwater and marine sources. Methane formation from sediment contents was inhibited by 50% at 0.07% ethylene concentration in the gas phase (approx. 5 #moll -1 in the aqueous phase) and by 94% at >i 0.5% ethylene in the gas phase (>1 36 #mol. 1-1 in the aqueous phase). Sulph...

Determination of petroleum hydrocarbons and polycyclic aromatic hydrocarbons in sludge from wastewater treatment basins.

Screening by gas chromatography with flame ionization detection and gas chromatography-mass spectrometry has been carried out on sludge extracts of wastewater treatment basins. Soxhlet extraction with trichlorotrifluoroethane was applied. The yields for petroleum hydrocarbons and PAH recovery were high, usually in excess of 90%. The proposed investigations permit a quick assessment of petroleum...

Fate and transport of petroleum hydrocarbons

Formation and consumption of single-ring aromatic hydrocarbons and their precursors in premixed acetylene, ethylene and benzene flamesy

ion via reaction (647) is dominant, due to its low activation energy, up to 0.4 cm above the burner while reaction (644) becomes dominant farther from the burner. Reaction with OH to give phenol, i.e., reaction (652), does not contribute significantly to benzene depletion while the reverse reaction even leads to benzene formation close to the burner. Benzene formation in the acetylene flame res...

Bioaccumulation and translocation factors of petroleum hydrocarbons in Aeluropus littoralis

Background: Polycyclic aromatic hydrocarbons (PAHs), which consist of fused conjugated aromatic rings, not only are toxic to humans and other living organisms, but will also pollute groundwater. These compounds can be point source or non-point source and are one of the most widespread organic pollutants. Some of them are suspected carcinogens and are linked to other health problems. This study ...