
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
Hydrothermal carbonisation (HTC) can be used to co-process anaerobic digestion (AD) digestate and lignocellulosic (or plant-based) feedstocks to improve the the hydrochar product quality. This AD waste co-processing route has been studied at bench scale.
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
Hydrothermal sludge treatment employs elevated temperatures and pressures in wet conditions and in the absence of oxygen