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Composting

Composting is a type of aerobic digestion in which sewage sludge is combined with bulking agents such as wood chip, straw or green wastes prior to composting to provide a pasteurised product. The process is a largely static system which is aerated by natural diffusion and is therefore low in energy demand. However, composting is a lengthy process (~6 months) and so employs large land areas.

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Composting 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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