46
SUPPLEMENT TO THE ANNUAL REPORT OF THE
TABLE II.—Analyses of Septic Tank effluents, Engineering College- cont .
Period II-October to December 1926.
Time of stay of sewage in the tanks— 18 hours.
N u m b e r .
Source.
Date.
Ammonia-
cal
nitrogen.
Albumi-
noid
nitrogen.
Oxygen
absorbed
in 4 hours.
1 9 2 6 .
2 0 Open tank
...
."
9th November
•••
..0
0.14
0.08
0.32
Closed tank
•••
•..
•..
Do.
•,,.
•••
0.13
0.07
0.29
21
Open tank
•••
•••
...
10th November
...
0.20
0.08
0.25
Closed tank
...
•••
•••
Do. , . .
0.14
0.07
0 24
22
Open tank
... 12th November
...
...
0.35
0.14
0.47
Closed tank
.••
...
-
Do. . • •
. • •
0.38
0.13
0.44
2 3
Open tank
...
•••
... 16th November
...
...
0.26
0.11
0.41
Closed tank
..•
61,0
...
Do.
1
,..
•••
0.36
0.13
0.63
24
Open tank
0114
...
17th November
...
..
0.26
0.12
0.53
Closed tank
te 0
4 0 4
...
Do,
...
0.30
0.12
0.43
25 Open tank
...
... 18th1November
...
...
0.36
0.13
0.54
Closed tank
0411
tele
.e.
..
Do. • • •
. . .
0.42
0.10
0.57
26
Open tank
••.
...
- 19th November
„.•
0.29
0.14
0.66
Closed tank
...
...
...
0.34
0.14
0.66
27
Open tank
••,
.8,
I.*
23rd. November
...
...
0.59
0.11
1.00
Closed tank
...
.110
Do.
ode
•••
0.54
0.13
0 . 9 1
28
Open tank
...
•••
._ 24th November
...
...
0.35
0.16
0.59
Closed tank
..•
•••
•••
Do.
•••
•••
0.42
0.14
0.45
29 Open tank
.••
060
...
26th November
...
...
0.54
0.15
0.77
Closed tank
...
••„
•••
Do.
...
•••
0.47
0.11
0.73
30
Open tank
•••
•••
... 30th November
•••
...
0.60
• 0.18
1.21
Closed tank
•••
...
Do.
..•
•••
0.62
0.20
1.18
31
Open tank
...
•••
... 1st December
,..
...
0.68
0.14
0.67
Closed tank
..•
...
Do,
•.,
...
0.56
0.12
0.57
32
Open tank
•••
...
... 2nd December
..•
•••
0.80
0.18
0.51
Closed tank
..•
...
60.11
Do.
...
0.72
0.20
0.52
33
Open tank
...
.••
,.. 3rd December
...
•••
0.80
0.24
0.53
Closed tank
-
•••
Do.
•••
0•11
0.70
0.12
0.54
AVERAGE.
Open tank ...
...
...
...
..•
••....
0.61
0.14
0.89
Closed tank ..•
...
...
.41.
4." 0.•
0.61
0.12
0.87
Period III—December 1926 to March 1927.
Time of stay of sewage in the tanks— 12 hours.
1926.
1
Open tank •••
•110
OS .
7th December
-
,„,
0.75
0.18
1.22
Closed tank _
"„
...
11•4
Do.
•••
••4
0.62
0.16
1.40
2
Open tank ...
...
.••
...
8th December
...
...
0.32
0.19
1.24
Closed tank ...
...
...
...
Do.
...
•••
0.44
0.18
1.26
3 Open tank ...
0•0
O..
...
9th December
...
...
0.61
0.18
1.33
Closed tank ...
•••
...
".
Do.
...
...
0.72
0.24
1.49
4
Open tank ...
...
•• n
0.•
10th December
...
,„
0.68
0.18
1.30
Closed tank ...
...
•••
...
Do.
...
0.74
0.16
1.28
5 Open tank ...
...
...
•••
14th December
-
...
1.00
0.24
1.46
Closed tank ...
•••
...
Do.
..•
...
0.80
0.24
1.51
6
Open tank ...
•••
17th December
...
0.92
0.22
1.44
...
Closed tank •••
•••
0 e.
e•D
Do.
•••
.••
0.53
0.22
1.49
7 Open tank ...
...
21st December • •
...
0.88
0.18
1.21
...
...
Closed tank ...
...
.•.
...
Do.
•••
•••
0.68
0.22
1.26
r
8
Open tank ......
... 22nd December
..,
...
0.68
0.10
1.08
Closed tank ...
...
,..
Do.
0.64
0.16
1.40
9 Open tank ...
...
.••
... 23rd December
...
0.72
0.18
0.94
Closed tank ...
...
...
...
Do,
•••
•••
0.68
0.19
1.13
1927.
10 '
Open tank ...
...
•••
... 4th January
...
...
0.68
0.18
1.04
Closed tank ...
..•
.••
1,64
Do.
...
...
0.60
0.11
1.04
11
Open tank ...
•••
• ...
... 5th January
•••
lea
0.70
0.18
1.13
Closed tank .,.
-
--
•••
Do.
•••
0.60
0.13
1.06
12
Open tank ...
•••
•••
... 6th January
•••
•••
1.00
0.18
1.10
Closed tank ,..
...
•••
...
Do,
...
...
.. 0.60
0.14
1.06
13
Open tank ...
...
...
7th January
...
...
0.88
0.20
1.24
Closed tank ...
•••
...
•••
Do. ,
.•.
0.97
0.19
1.56
14
o p e n t a n k
. . .
• • •
04. ...
y)pen
llth January
...
0.96
0.24
1.70
Closed tank ...
...
•••
...
•
Do.
•••
•••
0.88
0.16
1.60