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Evaluating the effect of autoclaving on the rate of bioprocessing of waste - Experimental trials with MSW autoclaved at 200°C

Abstract : The objective of this experimental run was to test the biodegradability and the ability to treat through composting an autoclaved MSW at 200 °C. The waste (Floc MSW 200) was tested alone and also mixed with seeding materials: pig slurry and liquid sludge, in order to study the effect of seeding. Respirometric measurements and pilot composting trials were run with the three mixtures. Results were compared to those obtained with the same MSW autoclaved at 130°C. The respirometric results indicated that the autoclaved MSW at 200 °C had a low biodegradability (20 to 30% of the total organic matter) that can be limited by the physical state of the substrate (settlement). The nature of the seeding did not influence very much the biodegradability. The MSW autoclaved at 200°C was less biodegradable than the one autoclaved at 130°C (40 to 50 % of biodegradable organic matter). The composting experiments confirmed the results obtained through respirometry. Indeed, the evolution of the matter was slow (around five days to reach the maximum temperature) and the maximum oxygen uptake rate was low (less than 20 mmol O2/h/kg DM ini). Surprising results were obtained for the mixture with pig slurry. According the respirometric results, this one should have been the most biodegradable but was the less reactive through composting. Physical or microbiological limitations should have occurred during composting for this mixture. During composting any significant methane emissions were measured and ammonia emissions were also very low (perhaps because of the low temperature reached: maximum 50°C). Leaching was very important during composting. It represented 50 to 60 % of the water losses and explained 60 to 80 % of the nitrogen losses. As concluded in the study of the autoclaved MSW at 130°C, no significant effect of the seeding was observed neither through respirometric measurement, nor through composting.
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Submitted on : Friday, May 15, 2020 - 12:21:19 PM
Last modification on : Thursday, August 26, 2021 - 1:22:01 PM


  • HAL Id : hal-02587893, version 1
  • IRSTEA : PUB00019753



A. Trémier. Evaluating the effect of autoclaving on the rate of bioprocessing of waste - Experimental trials with MSW autoclaved at 200°C. irstea. 2006, pp.27. ⟨hal-02587893⟩



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