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Alkaline stabilisation

Alkaline stabilisation is a chemical method designed to reduce sludge odour and putrescence (i.e. decay), and the level of pathogenic organisms. This is achieved by raising the pH of the sludge using lime. The process may be supplemented by dosing with waste solid materials to reduce the amount of lime used. Although adding material to the sludge increases its volume, the process is simple, effective and low in capital cost.

Alkaline stabilisation related videos

Lime slaking and dosing, Techmatic Source: Techmatic Engineering PTY LTD / YouTube

Lime slaking and dosing, Techmatic

A video to demonstrate the principles of the Techmatic lime slaking and dosing process.

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Alkaline stabilisation 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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