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THERMAL HYDROLYSIS TO INCREASE SLUDGE BIODEGRADABILITY OR HOW TO TURN MESOPHILIC ANAEROBIC DIGESTION OF BIOLOGICAL SLUDGE INTO AN ATTRACTIVE PROCESS

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Abstract:

The process BioTHELYS® is a pre-treatment for mesophilic anaerobic digestion by thermal hydrolysis. This process has been operated for almost one year in Saumur (France). The current operating conditions are: a temperature of 160–170°C and a hydraulic retention time of circa 30 minutes with concentrated sludge at 12 to 16% dryness. The main effects observed at Saumur on the hydrolysed sludge are the improvement of biodegradability and better viscosity. VS removal in mesophilic anaerobic digester is improved of circa 40 % compared to conventional VM removal on pure biological sludge. Digested sludge after thermal hydrolysis reach 28–30% dryness on centrifuge and are sanitized and stabilised without any nasty odor.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864707787969513

Publication date: 2007-01-01

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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