44
SUPPLEMENT TO THE ANNUAL REPORT OF THE
TABLE I.-Analyses of Raw sewage, Engineering College, Guindy-cont .
Date.
Ammoni-
acal
nitrogen.
Albuminoid nitrogen.
Oxygen
absorbed
in 4 hours.
Date.
Ammoni.
acal
nitrogen.
Albuminoid
nitrogen.
Oxygen
absorbed
in 4 hours.
Period III-cont.
Results are expressed in parts per 100,000- cont.
1927.
1927.
16th February ...
0.92
0.53
2.60
21st March
...
0.72
0.40
2.39
21st „
1.08
0.34
1.85
22nd ,,
0.61
0.36
1.91
. . .
22nd
„
...
0.86
0.32
177
28th „
...
0.88
0.48
2.72
7th March
...
0.65
0.32
1.89
...
8th
0.72
0'56
2.89
Average ...
0.80
0.89
2.06
14th „
...
0.64
0.55
2.86
15th „
...
0.88
0.48
2.12
Average for the
16th „
...
0.68
0.34
2.12
year ...
...
0.71
0.31
1.84
17th „
...
0.84
0.28
2.14
TABLE II.— Analyses of Septic Tank effluents, Engineering College.
Period L-July to October 1926.
Time of stay of sewage in the tank— 24 hours.
N u m B e r
Source.
Date.
Ammonia-
cal
introgen.
Albumi-
noid
nitrogen.
Oxygen
absorbed
in 4 hours.
Results are expressed in parts per 100,000.
1926,
1
Open tank
...
. . . ...
6th July
. . .
0.28
0.12
0.28
Closed tank
...
...
Do.
.
...
...
0.34
0.12
0.35
2
Open tank
...
...
... 13th July
...
...
0.32
0.10
0.86
C l o s e d t a n k
. . . .
Do.
...
...
0.40
0.12
0.76
3
Open tank
..
...
... 2 7 t h j u l y
'"
0.96
0.21
1.64
Closed tank
...
...
Do.
...
...
0.90
0 . 2 5
1 . 3 9
4 Open tank
...
...
...
4th August
..
. . .
1.32
0.19
1.65
Closed tank
...
...
...
Do.
...
. . .
1.20
0.20
1 54
5 Open tank
...
...
... 10th August
.
.
1.50
0.16
1.52
Closed tank
...
.... ...
Do.
... ...
1.38
0.17
1.66
6
Open tank
... ... 12th August
...
.
1.00
0.29
1.57
Closed tank
...
...
...
Do
...
...
1.01
0 22
1.54
7
Open tank
... ...
... 13th August
... ...
1.34
0.20
1.68
Closed tank
... ...
Do.
...
. . .
1.20
0.18
1.73
Open tank
...
,.. 17th August
...
...
1.01
0.19 .
0.82
8
Closed tank
. . . ...
Do.
...
...
1.01
0.3.4
0 75
9 Open tank
. . . ...
18th August
...
...
1 . 0 8
0.17
...
...
Closed tank
...
Do.
...
.
1 . 0 1
0 . 1 8
. . .
10
Open tank
... ...
... 19th August
...
...
0.92
0.16
1.47
Closed tank
...
...
...
Do.
...
. . .
0.97
014
1.50
1 1
Open tank
...
.. 24th August
.
...
1.10
0 22
1.74
d tank
.
.
...
Closed
Do.
...
. . .
0.79
0.19
1 60
12
Open tank
...
... 25th August
... ...
0.82
0.17
1.46
Closed tank
..
...
...
Do.
...
...
0.62
0.11
1.43
1 3 Open tank
.
...
... 26th August
... ...
0.86
0.19
l.53
Closed tank
...
...
...
Do.
...
•..
0.83
0.16
1.38
1
4
Open tank
. . . ...
...
31st August
. . . ...
0.97
0.22
1.72
.
Closed tank
. . . . .
Do.
... ...
0. 86
0.19
1.42
1 4 -
Open tank
...
... ...
1st September
...
...
0.91
0.19
1.48
Closed tank
...
-
...
Do.
0.83
0.16
1.72
1 7 Open tank
...
. . .
2nd September
... ...
0 93
0.16
1.32
d C l o s e d
t a n k
. . .
. . . osed
Do.
...
...
0 99
0.17
1.45
1 8 Open tank
...
3rd September
...
. . .
1.14
0.26
1.52
...
Closed
t a n k
Do.
...
.
1.09
0.27
1.45
17
Open tank
...
-
...
6th September
...
0.65
0.22
1.07
Closed tank
...
...
Do.
...
0.62
0. 21
1.07
19
Open tank
. . . ... ...
7th September
...
...
0.96
0.17
1.26
Closed tank
...
...
. . .
Do
. . . ...
0.78
0.16
1. 48
2 0 Open tank
.
8th September
.
...
1.10
0.19
1.41
Closed tank
... ...
...
Do.
...
...
0.84
0.16
l.13
21
Open tank
...
-
... 10th September
...
...
0.96
0.22
1.40
Closed tank
...I
...
Do.
... ...
0 75
0.19
1.87
2 2
Oplosed
tank
... .. 13th September
.
, ,
0.88
0.24
1.44
C l o s e d t g a n k
Do.
... ...
0.73
0.13
1.53