title: The influence of petroleum products on the methane fermentation process.
abstract: In this study the influence of the petroleum products: diesel fuel and spent engine oil on the sewage sludge digestion process and biogas production efficiency was investigated. Microbiological, chemical and enzymatic analyses were applied in the survey. It was revealed that the influence of the petroleum derivatives on the effectiveness of the methane fermentation of sewage sludge depends on the type of the petroleum product. Diesel fuel did not limit the biogas production and the methane concentration in the biogas, while spent engine oil significantly reduced the process efficacy. The changes in physical-chemical parameters, excluding COD, did not reflect the effect of the tested substances. The negative influence of petroleum products on individual bacterial groups was observed after 7 days of the process, while after 14 days probably some adaptive mechanisms appeared. The dehydrogenase activity assessment was the most relevant parameter to evaluate the effect of petroleum products contamination. Diesel fuel was probably used as a source of carbon and energy in the process, while the toxic influence was observed in case of spent engine oil.
authors.affiliation: Warsaw University of Technology, Faculty of Environmental Engineering, Nowowiejska, 00-653 Warsaw, Poland.
authors.forename: Paweł
authors.initials: P
authors.lastname: Choromański
authors.affiliation: Warsaw University of Technology, Faculty of Environmental Engineering, Nowowiejska, 00-653 Warsaw, Poland. Electronic address: ewa.karwowska@is.pw.edu.pl.
authors.forename: Ewa
authors.initials: E
authors.lastname: Karwowska
authors.affiliation: Warsaw University of Technology, Faculty of Environmental Engineering, Nowowiejska, 00-653 Warsaw, Poland.
authors.forename: Maria
authors.initials: M
authors.lastname: Łebkowska
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D005285:Fermentation / Q000187:drug effects; D008697:Methane / Q000378:metabolism*; D010088:Oxidoreductases / Q000378:metabolism; D010578:Petroleum / Q000633:toxicity*; D012722:Sewage / Q000382:microbiology; D014866:Waste Products
chemical_list: D010578:Petroleum; D012722:Sewage; D014866:Waste Products; D010088:Oxidoreductases; D008697:Methane
keywords: Biogas; Methane fermentation; Petroleum products