Operator Reference

Abbreviations

Every abbreviation used across the formula tables. Filter to find one fast.

atm: atmospheres
BOD₅: biochemical oxygen demand
C: Celsius
CBOD₅: carbonaceous biochemical oxygen demand
cfs: cubic feet per second
cm: centimeters
COD: chemical oxygen demand
DO: dissolved oxygen
EMF: electromotive force
F: Fahrenheit
F/M ratio: food to microorganism ratio
ft: feet
ft lb: foot-pound
g: grams
gal: US gallons
gfd: US gallons flux per day
gpcd: US gallons per capita per day
gpd: US gallons per day
gpg: grains per US gallon
gpm: US gallons per minute
hp: horsepower
hr: hours
in: inches
kg: kilograms
km: kilometer
kPa: kilopascals
kW: kilowatts
kWh: kilowatt-hours
L: liters
lb: pounds
Lpcd: liters per capita per day
Lpd: liters per day
Lpm: liters per minute
LSI: Langelier Saturation Index
m: meters
MCRT: mean cell residence time
mg: milligrams
MG: million US gallons
MGD: million US gallons per day
min: minutes
mL: milliliters
ML: million liters
MLD: million liters per day
MLSS: mixed liquor suspended solids
MLVSS: mixed liquor volatile suspended solids
OCR: oxygen consumption rate
ORP: oxidation reduction potential
OUR: oxygen uptake rate
PE: population equivalent
ppb: parts per billion
ppm: parts per million
psi: pounds per square inch
Q: flow
RAS: return activated sludge
RBC: rotating biological contactor
RPM: revolutions per minute
SBOD₅: soluble BOD
SDI: sludge density index
sec: second
SOUR: specific oxygen uptake rate
SRT: solids retention time
SS: settleable solids
SSV₃₀: settled sludge volume 30 minute
SVI: sludge volume index
TOC: total organic carbon
TS: total solids
TSS: total suspended solids
VS: volatile solids
VSS: volatile suspended solids
W: watts
WAS: waste activated sludge
yd: yards
yr: year