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Sludge conditioning
An overview of sludge conditioning − chemical and thermal
Conditioning
Sludge thickening and dewatering processes normally require pre-treatment to assist the separation of the water from the solids. This pre-treatment is referred to as conditioning, which takes the form of either chemical dosing or thermal treatment.
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Introduction to sludge conditioning
Thickening and dewatering processes often need pre-treatment (conditioning) to help separate the water from the solids
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Chemical sludge conditioning
The chemical pre-treatment of sludge helps remove water upstream of thickening and dewatering processes
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Thermal sludge conditioning
Thermal processes are used to condition sludges upstream of anaerobic digestion as well as pre-treating sludge for dewatering
Conditioning related videos
Swingmill sludge dewatering mechanical process
Video to demonstrate the operation of the Swingmill sludge dewatering screw press from Dewlink Sludge Treatment
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Conditioning 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 Conditioning topics…
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Heating
Thermal conditioning can be employed upstream of both dewatering and anaerobic digestion to improve their effectiveness
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Reagent dosing
Chemical conditioning by reagent dosing is designed to agglomerate smaller particles into larger ones to improve separation
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Thickening
Thickening processes concentrate the sludge by removing part of the free water, such that the product can still be pumped
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Dewatering
Dewatering processes mechanically remove a significant proportion of the sludge water to produce a 15-45% cake product
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Drying
In sludge drying the sludge moisture is removed as water vapour by heating, generating a pelleted or powdered product
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Conditioning
Conditioning is the pretreatment of sludge upstream of thickening and dewatering to promote solid-liquid separation
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Thickening
Thickening processes concentrate the sludge by removing part of the free water, such that the product can still be pumped
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Dewatering
Dewatering processes mechanically remove a significant proportion of the sludge water to produce a 15-45% cake product
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Drying
In sludge drying the sludge moisture is removed as water vapour by heating, generating a pelleted or powdered product
More process and operation topics…
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Sludge stabilisation
Sludge stabilisation − alkaline stabilisation, lime and solids dosing, plus anaerobic and aerobic digestion
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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