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Sludge stabilisation
An overview of sludge stabilisation − alkaline stabilisation, lime and solids dosing, plus anaerobic and aerobic digestion
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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About sludge stabilisation
Stabilisation processes reduce the odour and putrescence of sludge, and level of pathogenic organisms
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Aerobic digestion
An overview of aerobic digestion and sludge composting
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Sludge treatment − an overview of aerobic digestion
Aerobic digestion is the degradation of the organic sludge solids in the presence of oxygen
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Sludge treatment − composting
Composting is a type of aerobic digestion. The most established method for composting is through the use of windrows
Composting features and blogs
Feature
Co-processing of sewage digestate by hydrothermal carbonisation
Hydrothermal carbonisation (HTC) can be used to co-process anaerobic digestion (AD) digestate and lignocellulosic (or plant-based) feedstocks to improve the the hydrochar product quality. This AD waste co-processing route has been studied at bench scale. Read article
More process and operation topics…
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Thickening, dewatering & drying
Thickening, dewatering and drying extract water from sludge to reduce the sludge volume
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Thermochemical processes
Thermochemical methods are used to either significantly reduce the sludge solids content or pre-treat sludge upstream of AD
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Sludge quality
Sludge is the main waste stream from the treatment of wastewater