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Digestion anaérobie des boues en station d’épuration : état de l’art du parc français

Abstract : There is a growing interest among communities in the anaerobic digestion of sewage sludge. Indeed, this biological process allows to reduce sewage sludge quantity and to produce stabilized sludge and biogas. The biogas can be used for heat production, converted into electricity, used as biofuel or injected into the natural gas grid since the modification in June 2014 of the decree of November 23, 2011. This study is motivated by this regulatory development and should provide an inventory of fixtures of the current practices in France regarding the digestion of sewage sludge. The results presented were obtained following a survey of the wastewater treatment plant operators. 96 installations of sewage sludge methanisation were counted in France. The questionnaire replies were used to identify the most common practices as well as the problems encountered by the operators. The digesters are most of the time designed to operate with a mixture of primary and secondary sludge heated at 37°C or 55°C with the produced biogas. Although the operators sometimes add fats to the mixture, co-digestion is still rarely used due to regulatory constraints. The performances in terms of sludge reduction and biogas production have been determined and linked to the type of introduced sludge. Despite some difficulties related to clogged pipes, sludge return liquors loaded in nitrogen, or the respect of gas and dehydrated sludge quality standards, the operators seem to be satisfied and an increasing number of projects has been identified. The biogas is now mainly used to produce energy in addition to heating the digester, and at the end of 2018, 8 communities have already chosen to inject biomethane into the natural gas grid.
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https://hal.inrae.fr/hal-02964067
Contributor : Sylvie Gillot <>
Submitted on : Monday, October 12, 2020 - 10:15:53 AM
Last modification on : Thursday, April 22, 2021 - 2:34:06 PM

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Eva Falipou, S. Gillot, Jean-Pierre Canler, Jean-Marc Perret. Digestion anaérobie des boues en station d’épuration : état de l’art du parc français. Techniques Sciences Méthodes , ASTEE/EDP Sciences, 2020, pp.57-69. ⟨10.36904/tsm/202009057⟩. ⟨hal-02964067⟩

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