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Modern Landfill Fundamentals
Published in Debra R. Reinhart, Timothy G. Townsend, Landfill Bioreactor Design and Operation, 2018
Debra R. Reinhart, Timothy G. Townsend
While gas generated within the landfill will migrate toward a well due to the pressure difference between the landfill interior and the atmosphere, passive venting does not always result in large collection efficiencies. An alternate approach is to place a vacuum on the well, thus creating a greater potential to remove gas from the landfill. This normally is accomplished by connecting individual wells to a pipe network that is in turn connected to a mechanical blower. The blower induces a vacuum in the manifold and the wells, extracting gas from the landfill interior. The goal of an active landfill gas collection system is to remove the maximum amount of gas possible from the waste, thus minimizing migration to the atmosphere. The applied vacuum must not be so great, however, that air is drawn into the landfill. The presence of oxygen may result in a landfill fire, the methanogenic microbial activity may be suppressed, and the treatment or reuse operation may suffer.
Temporal trend in the levels of polycyclic aromatic hydrocarbons emitted in a big tire landfill fire in Spain: Risk assessment for human health
Published in Journal of Environmental Science and Health, Part A, 2018
Joaquim Rovira, Noelia Domínguez-Morueco, Martí Nadal, Marta Schuhmacher, José L. Domingo
PAHs are organic compounds composed of multiple aromatic rings. They are associated with incomplete combustions, either of natural origin (e.g., volcanic eruptions or forest fires) or from anthropogenic sources (e.g., emissions from industrial complexes, traffic, domestic heating), including tire landfill fires like that of Seseña.[5,6] The International Agency for Research on Cancer (IARC) has classified some PAHs as carcinogenic to humans. In addition, the US Environmental Protection Agency (US EPA) has established a list of 16 priority PAHs (naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, chrysene, benzo(a)anthracene, benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(a)pyrene, dibenzo(a,h)anthracene, benzo(g,h,i)perylene and indeno(1,2,3-cd)pyrene), being seven of them considered as probable human carcinogens. Benzo(a)pyrene (BaP) and dibenzo(a,h)anthracene are the two most potentially toxic, being also carcinogenic. Based on the toxicological profiles of the PAHs, the emission of these organic compounds during the tire landfill fire could mean relevant health risks, both non-carcinogenic and carcinogenic, for the population living in the vicinity.