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Glossary (D)

Updated on

Having problems with our terms and abbreviations? Use Ctrl+F to search our list of glossary items below. Contact us if you find a sludge abbreviation or glossary term you think it would be useful to add.

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Decanter/Decanting centrifuge

Alternative term for solid bowl centrifuge

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Denitrification

Biochemical conversion of nitrate to nitrogen gas

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Denitritation

Biochemical conversion of nitrite to nitrogen gas

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Dewatering

Removal of water from sludge to generate a non-flowing solids product (or 'cake')

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Diaphragm/membrane press

Modification of filter press providing enhanced pressure by using an inflatable diaphram in the filter cells

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Differential velocity

Difference in the rotational velocities of the screw conveyor and bowl of a centrifuge

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Digestate

Residual solids, normally as a 20% solids slurry, from anaerobic digestion (AD)

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Disc nozzle centrifuge

Centrifuge based on a series of stacked inverted cones

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Dissolved air flotation DAF

Thickening process using precipitated air to encourage flotable suspended solids to rise to the tank surface, where they are removed by skimming

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Dissolved carbon

Concentration of dissolved carbon in mg/L

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Dissolved oxygen concentration DOC

Concentration of dissolved oxygen in mg/L

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Drainability

Extent/rate of draining of water from settled sludge solids

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Drum filter/screen

Cylindrical screen of a screw press through which filtrate passes

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Dry carbonisation

Carbonisation (sludge thermochemical treatment favouring the formation of the solid phase as the primary production) in the absence of water

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Dry solids DS

Solids content of sludge either as a percentage or in units of mass per unit volume

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Dry thermochemical methods

Thermochemical treatment in the absence of water, normally comprising incineration, pyrolysis and gasification

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Drying bed

Shallow beds with a porous base used to dewater sludge by draining

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This page was last updated on 23 April 2021

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