Abbreviation

Explanation

BOD

Biological oxygen demand

COD

Chemical oxygen demand

TOC

Total organic carbon

VS

Volatile solids

HRT

Hydraulic retention time

SRT

Sludge retention time

ASBR

Anaerobic sequencing batch reactor

SBR

Sequencing batch reactor (aerobic)

UASB

Up-flow anaerobic sludge blanket

MBBR

Moving-bed biofilm reactor

MBR

Membrane bioreactor

F/M

Food to microorganism