Thermal hydrolysis (TDH) as a pretreatment method for the digestion of organic waste

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 microorg...

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Bibliographic Details
Published in:Water science and technology 2000-01, Vol.41 (3), p.181-187
Main Authors: SCHIEDER, D, SCHNELDER, R, BISCHOF, F
Format: Article
Language:English
Subjects:
Additives
Anaerobic digestion
Anaerobic processes
Anaerobic treatment
Bacteria, Anaerobic - metabolism
Biodegradation
Biodegradation, Environmental
Biogas
Biological and medical sciences
Biological treatment of sewage sludges and wastes
Biosolids
Biotechnology
Carcasses
Chain scission
Composting
Composts
Dewatering
Digestion
Disinfection
Energy recovery
Energy resources
Energy sources
Environment and pollution
Fermentation
Food
Fragments
Fundamental and applied biological sciences. Psychology
Garbage
Gases
Germany
Heat
Hot Temperature
Hydrolysis
Incineration
Industrial applications and implications. Economical aspects
Methane - analysis
Microorganisms
Organic wastes
Pretreatment
Pyrolysis
Raw materials
Recycling
Refuse Disposal - instrumentation
Refuse Disposal - methods
Residential areas
Sewage
Sewage sludge
Sludge
Sludge digestion
Solid wastes
Temperature
Time Factors
Waste recovery
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Summary: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.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2000.0070