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Hydrothermal liquefaction

Hydrothermal liquefaction (HTL) of sewage sludge takes place generally at temperatures of 250–400 °C and pressures above 40 bar. The primary end product formed from the generated condensable gases is a highly viscous liquid (a bio-oil) used as either a pure chemical feedstock or an additive in diesel fuels. HTL has been has been extensively investigated for ‘cleaner’ biomass feeds, and specifically microalgae, but is less well developed than hydrothermal carbonisation for sewage sludge applications.

Hydrothermal liquefaction related videos

TerraNova® Ultra Hydrothermal Carbonization of Sewage Sludge Source: TerraNovaEnergy / YouTube

TerraNova® Ultra Hydrothermal Carbonization of Sewage Sludge

A video to demonstrate the principles of the TerraNova® Ultra Hydrothermal Carbonization of sewage sludge.

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Hydrothermal liquefaction features and blogs

Fig. 4.  SP filtrate and acidified sludge samples

Phosphorus recovery by sludge acidification and dewatering

A pilot-scale Danish study of phosphorus extraction from acidified anaerobic and aerobic sludge samples has revealed removal to be more effective from anaerobic sludges, even though the digested sludge alkalinity increases the total acid demand.

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