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Sludge thermochemical treatment

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Thermochemical methods for sludge

Thermochemical methods are used for either:

  • significantly reducing the sludge solids content, or
  • pre-treating sludge upstream of anaerobic digestion (AD) to increase the biodegradability of the organic carbon.

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.

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Example of a commercial biomass gasification process, Valmet Source: Valmet / YouTube

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