Table 10.1 Volatile Acids Concentrations in Raw Sewage and in Lime Treated Raw Sewage Determined by the Direct Injection Procedure and by that of
Standard Methods.
Gas-Liquid Chromatography
Propionic
Butyric
Isovaleric
Valeric
Comparison
acid
acid
acid
acid
Standard methods
of g.l.c. and
Total volatile
analysis total
standard method
% of
(mg l
−1
)
(mg l
−1
)
(mg l
−1
)
(mg l
−1
)
acids (mg 1
−1
)
organic acids
difference
volatile
(mg l
−1
)
HA
c
(mg l
−1
)
as HA
c
(mg1
−1
)
as HA
c
(mg l
−1
)
as HA
c
as HA
2
(mg l
−1
) as HA
c
(mg
−1
)as HA
c
acids
90.09
7.36
0
0
0
0
0
0
38.41
45.2
6.79
85
4.28
3.48
0.82
0.56
0.44
0.26
0
0
33.70
48
14.3
70
7.21
5.78
11.9
0.81
0.95
0.25
0
0
46.06
50.4
4.34
91.4
5.72
4.58
1.19
0.81
0.50
0.29
0
0
41.08
48.3
7.21
85
Source:Author’s own files