Abstract
Temperature is a relevant physical parameter to monitor the biodegradation phases of waste mass. Irstea and the landfill operator SAS Les Champs Jouault have been collaborating since 2011 to study the temporal evolution and the spatial distribution of temperature in a municipal solid waste cell. Using distributed temperature sensing technology, optical fibres were installed in waste mass composed of household waste and industrial waste at different depths during the landfilling period. Temperature distributions were studied from 2012 until 2018 and the same evolutions are observed everywhere with more or less important amplitude variations depending on the location of the measurement point. When landfilled, the waste is at ambient temperature and a significant increase is observed the following year due to the exothermic impact of the aerobic biodegradation phase before a slower decrease during the anaerobic biodegradation phase over several years. Thermal parameters of the waste mass and the surrounding soil, as well as the heat generation function, are calculated using numerical simulation to reproduce the temperature evolution and its spatial distribution. The study of the long-term temperature evolution makes it possible to evaluate the favourable period during which the deposit cell will be in optimal conditions to promote the biodegradation waste processes.
Highlights
Landfilling is still a main option of solid waste management among the different strategies available today
The main goals of the continuously recorded point sensors were (i) to consider these measurements as references and to compare these data to those recorded by the fibre-optic sensors to confirm their reliability and (ii) to obtain a continuous temperature evolution at specific points located in the waste mass
The electrical connections located in the waste mass are suspected of being damaged by humidity, compaction, corrosion and temperature, even with insulating protection
Summary
Landfilling is still a main option of solid waste management among the different strategies available today. To optimise the waste stabilisation process and enhance energy production from biogas, some landfills are operated as bioreactors [2,3,4]. This concept induces leachate recirculation to increase moisture content, which is generally insufficient in sanitary landfills. In France [8], the waste has to be covered at the end of the filling operation before using the leachate recirculation system, which is mainly composed by horizontal perforated pipes rather than vertical wells
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