
Oxidative thermochemical treatment
An introduction to oxidative sludge thermochemical treatment methods
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Thermochemical methods are used for either:
As with stabilisation and drying processes, thermochemical processes produce a stable sludge product. When operated at elevated temperatures, i.e. for solids destruction rather than AD pre-treatment, they provide energy recoverable either as heat or a combustible gas or liquid.
An introduction to oxidative sludge thermochemical treatment methods
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An introduction to non-oxidative sludge thermochemical treatment methods
An example of Valmet's gasification technology
Pre-treatment of sludge by thermal hydrolysis upstream of anaerobic digestion is used to improve AD efficiency. A study looked at (pre-)commissioning data for a full-scale AD installation undergoing upgrading with TH to assess the basis for optimisation.
Read articlePyrolysis refers to the decomposition of organic matter at elevated temperatures in the absence of oxygen and water
Gasification is an extension of the pyrolysis process for thermochemical treatment of sludge
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Hydrothermal sludge treatment employs elevated temperatures and pressures in wet conditions and in the absence of oxygen