Water Science and Technology Vol 41 No 3 pp 181–187 © IWA Publishing 2000
Thermal hydrolysis (TDH) as a pretreatment method for the digestion of organic waste
D. Schieder*, R. Schneider** and F. Bischof***
*ATZ-EVUS, Application and Technology Center, Department of Environmental Engineering, Kropfersrichter Str. 6-8, D-92237 Sulzbach-Rosenberg, Germany
**ATZ-EVUS, Application and Technology Center, Department of Environmental Engineering, Kropfersrichter Str. 6-8, D-92237 Sulzbach-Rosenberg, Germany
***ATZ-EVUS, Application and Technology Center, Department of Environmental Engineering, Kropfersrichter Str. 6-8, D-92237 Sulzbach-Rosenberg, Germany
ABSTRACT
The recycling concept under consideration is based on the process of Thermal
Hydrolysis (TDH) followed by an anaerobic digestion. By increasing pressure
and temperature the organic part of the waste is split up in a first step
into short-chain fragments that are biologically well suited for
microorganisms. The following fermentation runs much faster and more
complete than in conventional digestion processes and the biogas yield is
increased. Left is just a small amount of a solid residue that can be
easily dewatered and utilized as surrogate fuel for incineration or as
compost additive. The thermal hydrolysis process allows a complete energy
recovery from organic waste. During the total procedure more energy sources
are produced than are needed for running the plant. The procedure is
especially suited for wet organic waste and biosolids that are difficult to
compost, such as food scraps, biological waste from compact residential
areas and sewage sludge. As a complete disinfection is granted due to the
process temperatures the procedure is also suited for carcasses.
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