Nitrogen
Substance
Formula
Carbon
TOD'
BOD
%
Oz/ g substance
Glycol
CzH60z
39
1.29
Glycerine
C3Hs03
39
1.22
Mannitol
~1406
40
1.14
Glucose
~1206
40
1.07
Lactose
C12HzzOu
42
1.12
Dextrins
~lo05
45
1.19
Starch
~loOs
45
1.19
Benzene
~6
92
3.07
Toluene
C7Hs
91
3.13
Naphthalene
CwHs
94
3.00
Phenol
C6H60
77
2.39
o-cresol
C7Hs0
78
2.52
a-Naphthol
CwHsO
83
2.56
Pyrocatechol
C6H602
65
1.89
Benzoic add
C7H60z
69
1.97
Salicylic acid
C7H603
61
1.62
Benzyl alcohol
C7HsO
78
2.52
Aniline
C6H7N
77
..
2.66
Pyridine
CsHsN
76
..
2.53
Chin olin
C9H7N
84
..
2.66
' Theoretically calculated
"Including nitrification
Table2.3
Oxygen consumption and biodegradability of organic materials /14/.
C TN= SNOX + SNH4 + S1,N + Xs,N + XI,N
where CTN is total nitrogen,
SNox is nitrite + nitrate nitrogen,
SNH4 is ammonium- + ammonia nitrogen,
S1,N is dissolved inert organic nitrogen,
Xs,N is suspended easily degradable organic nitrogen,
X1,N is suspended inert (organic) nitrogen.
0.49
0.72
0.68
0.64
0.61
0.52
0.68
-
-
-
1.70
1.60
0.93
0.90
1.25
0.95
1.55
1.49
1.15
1.71
BOD20
-
0.94
0.94
0.95
0.91
0.84
0.90
-
-
-
2.00
1.80
1.60
0.90
1.45
1.25
1.95
-
-
-
(2.8)
The nitrogen fractions are determined either by conventional analysis values (the
Kjeldahl nitrogen, nitrite, nitrate, ammonium) or as a component of the organic
particles. Often it may be assumed that the nitrogen content in the different organic
fractions is rather constant from wastewater to wastewater. The result is therefore:
S1,N = fsi,N · S1,COD
(2.9)
X1,N = fxi,N · XJ,coo
(2.10)
Xs,N = fxs,N · Xs,coo
(2.11)
48