MBR and Sludge glossary (A)

A-lsMBR
Air-lift sidestream membrane bioreactor − aerobic

Ablative reactor
Reactor configuration based on a rotating disc used for fast pyrolysis

ABR
Anaerobic baffled reactor

AC
Activated carbon

Acetogenesis
Biochemical conversion of volatile fatty acids to acetic acid and mineral products

Acetotrophic
Bacteria which feed off acetate

Acidogenesis
Conversion of small organic molecules to volatile fatty acids

ADF
Average daily flow

ADUF
Anaerobic digester ultrafiltration

AE
Aerobic

Aerobic digestion
Sludge degradation in the presence of oxygen

AF
Anaerobic filter

After burner
Region above a thermochemical fluidised bed reactor where thermal oxidation takes place

Agglomerate
Action of agglomeration (v) or a single particle (or floc) formed from a collection of coalesced/aggregated particles

Air to solids ratio
Mass of air employed per unit mass of sludge solids in a dissolved air flotation process

Alkaline stabilisation
Stabilisation of sludge based on lime dosing

Alum
Aluminium sulphate

Anaerobic
In the absence of oxygen

Anaerobic digestion AD
Sludge degradation in the absence of oxygen

Anammox
Anaerobic ammonium oxidation

AniMBR
Anaerobic immersed membrane bioreactor

AnMBR
Anaerobic membrane bioreactor

Annular gap
Ring-shaped gap between two concentric cylinders

AnsMBR
Anaerobic sidestream membrane bioreactor

Antimicrobial resistant genes (ARG)
Genes which enable microbes to resist chemicals which are designed to attack them

AOC
Assimilable organic carbon

AOTE
Actual oxygen transfer efficiency

AOTR
Actual oxygen transfer rate

Archimedean
Type of large screw used for conveying solids or liquids though a cylindrical conduit

ASCE
American Society of Civil Engineers

Ash
Solid product stream generated from incineration

ASP
Activated sludge process

Aspect ratio
Length to diameter

Auger/screw reactor
Pyrolytic reactor configuration using a turning screw to transport the solids through the reactor

Autothermal
Sustained by the heat generated

AX
Anoxic