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Sludge stabilisation
An overview of sludge stabilisation − alkaline stabilisation, lime and solids dosing, plus anaerobic and aerobic digestion
Aerobic digestion
Aerobic digestion is the degradation of the organic sludge solids in the presence of oxygen. The oxygen is introduced as fine bubbles of air into the reactor. The micro-organisms in the sludge convert the organic material to carbon dioxide and water, and the ammonia and amino species to nitrate. Aerobic digestion resembles the conventional activated sludge (CAS) process but excludes a wastewater feed and employs longer solids retention times.
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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
Aerobic digestion related videos
Conventional activated sludge (CAS) process
Aerobic wastewater treatment with classical activated sludge. A taster for Judd Water & Wastewater Consultants' 'MBR Insights' training package, in this video Simon Judd explains classical aerobic wastewater treatment.
Aerobic digestion 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 Aerobic digestion topics…
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Alkaline stabilisation
Alkaline stabilisation reduces the sludge odour, putrescence and pathogenic organism content by raising its pH using lime
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Anaerobic digestion
AD stabilises the sludge biologically in the absence of air, producing a useful biogas while biodegrading the organic solids
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Alkaline stabilisation
Alkaline stabilisation reduces the sludge odour, putrescence and pathogenic organism content by raising its pH using lime
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Anaerobic digestion
AD stabilises the sludge biologically in the absence of air, producing a useful biogas while biodegrading the organic solids
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Aerobic digestion
Aerobic digestion is the degradation of the organic sludge solids to carbon dioxide in the presence of oxygen
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