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Thermochemical processes

Thermochemical methods are employed 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. When operated at elevated temperatures, i.e. for solids destruction rather than for AD pre-treatment, they provide energy recoverable either as heat (for oxidative processes) or a combustible gas or liquid (non-oxidative processes).

Thermochemical processes related videos

Example of pyrolysis process for sewage sludge: the Eisenmann Pyrobuster® Source: Eisenmann SE / YouTube

Example of pyrolysis process for sewage sludge: the Eisenmann Pyrobuster®

An example of the pyrolysis process for sewage sludge: the Eisenmann Pyrobuster® for the thermal treatment of sewage sludge.

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Thermochemical processes features and blogs

Fig. 4.  SP filtrate and acidified sludge samples
Feature

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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