Environmental Engineering FOURTH EDITION

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460 ENVIRONMENTAL ENGINEERING


LD.50
LDC.50
LET


M
A4
MACT
MeV
mss
MSS
MSW


me.
mt
m
m


N
N


NAA
NAAQS
NEPA
NESHAPS
NPDES
NPL
NPSH
NRC
NSPS
n
n
n
n
nC
ni

ocs
OSHA

P
P
P
P
P
AP
Pref

NO

lethal dose, at which 50% of the subjects are killed
lethal dose concentration at which 50% of the subjects are killed
linear energy transfer

mass of a radionuclide, in g
microorganisms (SS), in mg/L
maximum achievable control technology
million electron volts
mixed liquor suspended solids, in mg/L
moving source standards
municipal solid waste
megawatts (electrical); generating plant output
megawatts (thermal); generating plant input
mass, in kg
rank assigned to events (e.g., low flows)

number of leads in a scroll centrifuge (Chap. 9)
effective number of turns in a cyclone
Avogadro’s number, 6.02 x lG3 atoms/g-atomic weight
non-attainment areas
National Ambient Air Quality Standards
National Environmental Policy Act
National Emission Standards for Hazardous Air Pollutants
National Pollution Discharge Elimination System
noise pollution level
net positive suction head, m or ft
Nuclear Regulatory Commission
new (stationary) source performance standards
number of events (e.g., years in low flow records)
Manning roughness coefficient
revolutions per minute (Chap. 6)
number of subareas identified in a region
critical speed of a trommel, rotation&
number of individuals in species i (Chap. 3)

Outer Continental Shelf
Occupational Safety and Health Administration

erosion control practice factor (dimensionless ratio)
phosphorus, in mg/L
power, Nls or ft-lbls (Chap. 6)
precipitation, mm
pressure, kg/mz or lblft’ or N/m2 or atm
pressure drop, in m of water
reference pressure, Nlm’
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