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Sludge stabilisation
An overview of sludge stabilisation − alkaline stabilisation, lime and solids dosing, plus anaerobic and aerobic digestion
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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About sludge stabilisation
Stabilisation processes reduce the odour and putrescence of sludge, and level of pathogenic organisms
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Sludge treatment − alkaline stabilisation
Alkaline stabilisation is a chemical method to reduce sludge odour and putrescence, and the level of pathogenic organisms
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Sludge treatment − lime and solids dosing
Chemical stabilisation of sludge reduces its odour, putrescence and pathogenic bacteria content
Lime and solids dosing 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