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Thermal conditioning processes can be employed to improve the efficiency of both dewatering and anaerobic digestion and are usually based on either wet air oxidation or hydrothermal treatment. This results in partial degradation of the sludge solids, making the resulting material more biodegradable as well as more dewaterable than the untreated sludge.

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The CAMBI hydrothermal sludge treatment process Source: CAMBI THP / YouTube

The CAMBI hydrothermal sludge treatment process

Video demonstrating the CAMBI THP and anaerobic digestion process to produce biogas.

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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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