464 ENVIRONMENTAL, ENGINEERING
net BOD utilized in secondary treatment, kg/h
net solids produced by the biological step, kgh
plastic viscosity, N-s/m2
difference between bowl and conveyor rotational speed, rads
mean cell residence time, or sludge age, days
pump efficiency (Chap. 5)
wavelength, m
viscosity, in N-s/m2 or poise (lb-s/ft2)
growth rate constant, in s-l
maximum growth rate constant, in s-l
frequency of sound wave, cycle/s
shape factor
density, g/cm, kg/cm3, lb-s/fl! or lb-s2/ft?
density of a solid, in kg/m3
standard deviation, y direction, m
standard deviation, z direction, m
rotational speed, rads
shear stress, N/m2
yield stress, N/m2
rotational velocity, rads