Influence of Temperature and turbulence on the Oxygen Transfer in Water
37
TABLE 1 SUMMARY OF AERATION FORMULAE
Type of Aeration
Formulae
Symbols
Author
1. Natural river
R = K20°c(
c s - C) 1 . 0 2 4
τ -
2 0
Κ20
0 -reaeration
reaeration
coefficients
2. Diffused
aeration
3. Surface
4. Turbine
aeration
R = C G s
( 1 _ m ) H
m
WP
X
x ( C s - C ) x 1 . 0 2
T "
2 0 Q :
R = N o
( C
9
S ~
C ) C * x l . 0 2
T -
2 0
R = CR
x G
m d
y (C s - C)
C
= constant for the
aeration unit
Gs - air flow
H = = liquid depth
W = width
a
= oxygen transfer
coefficient
M,m,p = exponent
characteristics of
the aeration device
N Q = total oxygen
transferred
depending on
energy level
R = impeller
periphetal speed
d
= impelled diameter
x,y = exponent
characteristic of
the aeration device
Eckenfelder
Eckenfelder
Eckenfelder
5. Weir
aeration
R = a H (C s - C)
a
= weir
characteristics
H = height of weir
Gameson
REFERENCES
ECKENFELDER, W.W., "Water Quality Engineering for Practicing Engineers", Barnes and Noble
1970.
GAMESON, A.L.H., "Weirs and the Aeration of Rivers", Journal of the Institution of Water
Engineers, London, 11 (1957), 6.
NOVOTNY, V. "Mechanical Aeration of Surface Waters" (in Czech), Vodohospodarsky Casopis SAV,
Vol. XIV, (1966), No. 2, 229.
SOUTHGATE, B.A. "Some of the Latest Works of the Water Pollution Laboratory in England", (in
Czech), Vodni hospodarstvi, 1961, No. 11.
THACKSTON, E.L. Krenkel, P.A., "Reaeration Prediction in Natural Streams", Journal of the
Sanitary Engineering Division, ASCE, Vol. 95 (1969), SA5.