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Lime and solids dosing

Solids with appropriate properties can be used to supplement lime dosing for sludge stabilisation, reducing the lime dose required. This can be a favourable option if the solids are low in cost (i.e. waste materials such as fly ash generated from coal combustion) and offer a similar alkaline stabilisation propensity as lime.

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Lime and solids dosing 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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