[Report of the Medical Officer of Health for London County Council] page -

London County Council 1900

[Report of the Medical Officer of Health for London County Council]

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Table: Table IV.—Averages of the Figure relating to the rapid Sedimentation and subsequent Bacterial Treatment of Crude Sewage in a Coarse Coke-bed at the Northern Outfall Works. (Series III.)All quantities, except where otherwise stated, are expressed in parts per 100,000.

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Table IV.—Averages of the Figure relating to the rapid Sedimentation and subsequent Bacterial Treatment of Crude Sewage in a Coarse Coke-bed at the Northern Outfall Works. (Series III.)

All quantities, except where otherwise stated, are expressed in parts per 100,000.

Date.	Solids in suspension.	Oxygen absorbed from permanganate in 4 hours at 80° F.		Nitrous nitrogen.	Nitric nitrogen.
Date.	Solids in suspension.	By crude liquid. (Total putrescible matter.)	By clear liquid. (Dissolved putrescible matter.)	Nitrous nitrogen.	Nitric nitrogen.
1900.	Crude sewage as supplied to the settling tank A.
November	65.9	14.028	7.940	0.0020	0-0042
December	76.1	13.418	7.118	0.0086	Nil
Average for 1900	71.3	13.708	7.509	0.0055	0.0020
1901.
January	733	13.573	7.429	0.0143	.0333
February	77.7	13.500	7.756	0.0283	.2197
March	69.4	13.106	7.237	0.0145	.0700
April	50.3	11.273	5.908	0.0353	.0374
May	58.7	12.521	6.380	Nil	Nil
June	54.0	12.487	5.891	Nil	Nil
July	60.2	11.725	5.495	00013	Nil
August	60.7	13.659	6.339	Nil	Nil
Average for 1901	64.9	12.680	6.676	0.0134	0.0540
Average for the whole period	66.5	12.933	6.882	0.0115	0.0412
1900.	Settled sewage as supplied to coke.bed A.
November	15.4	8.410	6.026	0.0021 0.1123
December	15.6	8.000	5.655	0.0023 0.2824
Average for 1900	15.5	8.190	5.827	0.0022	0.2036
1901.
January	17.0	8.983	5.856	0.0056	0.3780
February	14.5	8.389	6.167	0.0101	0.3673
March	16.0	7.956	5.881	0.0022	0.1795
April	18.1	7.073	4.596	Nil	0.0910
May	10.8	7.845	5.120	Nil	0.0094
June	29.2	11.131	6.016	Nil	Nil
July	27.4	9.829	4.159	0.0013	Nil
August	32.7	10.195	3.724	Nil	Nil
Average for 1901	18.4	8.492	5.299	0.0030	0.1578
Average for the whole period	17.7	8.419	5.427	0.0022	0.1689
1900.	Effluent from, coke.bed A.
November	11.9	5.638 3.981		0.0687	0.8685
December	91	5064 3.418		0.0360	0.8425
Average for 1900	10.4	5.330	3.679	0.0512	0.8546
1901.
January	10.2	5.605	3.605	0.0286	0.8525
February	9.3	5.506	3.500	0.0678	0.6844
March	9.3	4.891	3.248	0.0331	0.5137
April	11.3	4.452	2.901	0.0133	0.2416
May	7.8	4.557	3.068	0.0258	0.4396
June	22.0	8.367	4.635	0.0220	1.7951
July	9.2	4.525	2.681	0.0230	1.1078
August	7.3	3.528	2.418	0.0100	1.1347
Average for 1901	9.9	5.026	3.205	0.0311	0.7197
Average for the whole period	10.0	5.100	3.320	0.0360	0.7524
Average percentage purification of the crude sewage during the whole period	85.0	60.6	51.8	—	—