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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.

Composting features and blogs

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Biosolids vs sewage sludge

Biosolids are usually considered to be the useful fraction of the sewage sludge. They are generally higher in solids concentration and lower in pathogen content, having gone through a stabilisation process such as chemical dosing, digestion and/or drying.

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