Burnable waste produced at CERN during upgrading, maintenance and dismantling campaigns may be contaminated with radioactive nuclides produced through activation of accelerator components. Here, we present a methodology for the radiological characterisation of burnable waste, which takes into account the wide range of potential activation conditions (beam energy, material composition, location, irradiation and waiting time). Waste packages are measured using a total gamma counter, with the sum of clearance limit fractions estimated using the fingerprint method. Gamma spectroscopy was found to be unsuitable for classifying this waste due to the long counting times required to identify many expected nuclides, but was retained for quality control purposes. Using this methodology, a pilot campaign was performed in which we were able to clear 13 m of burnable waste as conventional non-radioactive waste.
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http://dx.doi.org/10.1016/j.apradiso.2023.110782 | DOI Listing |
Appl Radiat Isot
June 2023
Radiation Protection Group, European Organization for Nuclear Research, 1211, Geneva, 23, Switzerland. Electronic address:
Waste Manag
April 2017
RWTH Aachen University, Unit of Technology of Fuels (TEER), Germany. Electronic address:
The residence of municipal solid waste within a landfill body results in a significant change of material properties. Experiences with the energetic utilisation of the burnable fractions from formerly landfilled waste are hardly documented, the influence of refuse derived fuels (RDF) from such materials on the performance of modern waste-to-energy plants is not sufficiently described in scientific literature. Therefore this study focuses on the energetic utilisation of refuse derived fuel from landfilled waste, processed in a mechanical waste treatment facility, and the impact of the material on the operation of the incineration plant.
View Article and Find Full Text PDFJ Environ Manage
March 2015
Department of Social and Environmental Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8527, Japan. Electronic address:
A two-stage closed downflow hanging sponge (DHS) reactor was used as a post-treatment to prevent methane being emitted from upflow anaerobic sludge blanket (UASB) effluents containing unrecovered dissolved methane. The performance of the closed DHS reactor was evaluated using real municipal sewage at ambient temperatures (10-28 °C) for one year. The first stage of the closed DHS reactor was intended to recover dissolved methane from the UASB effluent and produce a burnable gas with a methane concentration greater than 30%, and its recovery efficiency was 57-88%, although the amount of dissolved methane in the UASB effluent fluctuated in the range of 46-68 % of methane production greatly depending on the temperature.
View Article and Find Full Text PDFThis article discusses how residents in a local area contributed to the construction of knowledge in regard to scientific assessments in relation to a fire in a storage dump of burnable waste. Building on analytical concepts primarily from Social Worlds theory as well as some concepts from Actor-Network Theory, the analysis shows how dissent and a number of scientific controversies were initiated by some residents living nearby the waste dump who proved to be excellent network builders and who built a number of alliances with media and independent scientists, thus questioning the authorities' and their experts' legitimacy. Furthermore, the situated analysis identifies how a few persons--not very organized--were able to create a debate about scientific matters using their combined resources and strong alliance-building abilities, thus proving that in some cases there is no need for a higher level of organization.
View Article and Find Full Text PDFAppl Biochem Biotechnol
July 2004
University of Toledo, Toledo, OH 43606, USA.
Directly burnable biomass to be used primarily in steam boilers for power production has been researched and demonstrated in a variety of projects in the United states. The biomass typically comes from wood wastes, such as tree trimmings or the byproducts of lumber production, or from a cash crop, grown by farmers. Of this latter group, the main emphasis has been utilizing corn stover, or a prairie grass called switchgrass, or using tree seedlings such as willow.
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