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Fire extinguishers 5
Floor oils 69
Fuel (coal and coke) 33
Foods 403
Gases :—
Degreasing and rubber spreading works 22
Flue 92
Sludge digestion plant 280
Grit (from Power Stations) 4
Inks (marking, drawing and writing) 4
Insecticides 10
Instrument sets (ambulance) for sterilisation 26
Insulating materials for hot water systems 17
Lamps, gas detector 405
Laundry tests 46
Liquor (effluent from Beckton Gas Works) 360
Meals 86
Metals (various) 46
Milk, liquid 86
Milk, condensed and powdered 26
Miscellaneous 110
Oils, lubricating and fuel, etc 82
Paints, varnishes and distempers 1,590
Petroleum and allied samples 116
Plastics 7
Rain-water (atmospheric pollution deposit gauges) 92
Rubber and rubber substitutes 17
Scale from boilers, etc 5
Scouring powders and lavatory cleaners 36
Sewage and effluent 3,173
Sludge, primary and digested 2,581
Sludge, activated 734
Smoke in air, determinations 1,694
Sulphur gases in air, determinations :—
Lead peroxide cylinder method 138
Volumetric method 1,694
Water, etc., from steam raising plants 1,330
Water, drinking, chemical 63
Water, drinking, free chlorine tests 638
Water, drinking, bacteriological 758
Water, swimming bath, chemical 303
Water, swimming bath, free chlorine tests 364
Water, swimming bath, bacteriological 455
Water, river, chemical 3,308
Water, river, bacteriological 296
Water, miscellaneous 56
Trade wastes 149
Research and investigation samples at Northern and Southern
Outfall Works 1,842
26,562
The following paragraphs give a general indication of the source of origin of these
samples and of the consultative and advisory duties carried out for the various services
and departments of the Council.
Rivers and drainage
Throughout 1954 the whole of the sewage flow to the Northern Outfall Works was
treated by sedimentation and approximately one-quarter of it subsequently by the
activated sludge process. At the Southern Outfall Works the whole of the flow continued
to be treated by primary sedimentation only. In the case of both outfall works, the
plants functioned satisfactorily throughout the year and achieved as large a saving of
B.O.D. (biochemical oxygen demand) load on the water of the River Thames as could
be expected.
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