Oxidative thermochemical treatment
An introduction to oxidative sludge thermochemical treatment methods
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 example of Valmet's gasification technology
Pyrolysis 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