9
(B) This water is run over a condenser as cooling water, outside the engine room, then into a pit in the engine room and from there pumped to storage tanks for supplying cattle sheds with drinking water etc. for the animals.
Attached certificate B shows analyses of this water at two places.
(a) From pit in engine room after being over the condensers.
(b) From one of the cattle sheds.
Conclusions from the chemical standpoint.
(1) From the figures in A. the water is free from gross pollution. There is however no free chlorine in the water as used in the dairy and it may be advisable to put in more chlorine.
(2) From the figures in B the high free ammonia is suspicious and would be given by animal pollution. On the other hand there is no increase in chlorides which would be expected with this type of pollution. It is possible that there is a little free ammonia coming from the refrigerating plant causing this high figure.
23rd November, 1936.
(Sd.) V. C. Branson,
Government Analyst.
A.-Water originally derived from Pokfulam Reservoir.
LAB. No. T-3844 & 3846/7.
WATER ANALYSIS.
GOVERNMENT LABORATORY.
Hong Kong, 23rd November, 1936.
Sample received on the 20th November, 1936.
Particulars (a) Raw water from engine room.
(b) Filtered water from engine room.
(c) Filtered chlorinated water from cleansing room.
Physical Examination.
Colour (Lovibond Scale) 24 inch stratum. (a)
(b)
(c)
Yellow
1.0
1.3
1.2
Red
0.6
0.5
0.6
Blue
1.5
1.4
1.8
Total colour units
3.1
3.2
3.6
Odour
Normal
Normal
Normal
Transparency (In cms.)
+100
100
+100
Chemical Examination.
(All results expressed as 100,000).
Total Solids in Solution
5.1
5.1
5.1
Chlorine
1.10
1.10
1.20
Free Ammonia
0.0011 0.0011
0.0011
Albumenoid Ammonia
0.0011
0.0011
0.0011
Oxygen Absorbed (in 5 mins @ 100°C.)
0.037
0.040
0.036