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London County Council 1900

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

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Table: II.—CROSSNESS RESULTS.

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II.—CROSSNESS RESULTS.

Date.	Oxygen absorbed from ermanganate in 4 hours at 80" Fah.		Nitious nitrogen.	Nitric nitrogen.	Oxygen absorbed from permanganate in 4 h mrs at 80° Fah.		Nitrous nitrogen.	Nitric nitrogen.
Date.	By thecrndi liquid. (Total putrefcible matter.)	By the clear liquid. (Dissolved putrc-scible matter.)	Nitious nitrogen.	Nitric nitrogen.	By the crude liquid. (Total putreBcible matter.)	By the clear liquid. (Dissolved putrescible matter.)	Nitrous nitrogen.	Nitric nitrogen.
	Continuous treatment. Crude sewage as supplied to the 4-foot coke bed.				Continuous treatment. Effluent from the 4-foot coke-bed.
1899.
November	7.122	4.696	0.0050	0.0209	2.980	2.110	0.1216	0.1857
December ...	7.149	5.736	Nil	Nil	4.444	3.117	0.0156	0.0914
1900.
January ...	4.610	3.587	0.0124	0.1125	2.782	1.546	0.1216	1.0008
February ...	6.042	4.794	0.0700	0.0944	3.818	2.170	0.1701	0.3544
March	5.070	4.035	0.0161	0.0054	2.827	2.115	0.0567	0.0768
April .........	5.698	4.405	0.0105	0.0477	3.703	2.356	0.1167	0.1586
May	4.922	3.715	Nil	Nil	3.087	2.066	0.0177	0.0284
Average for the whole period	5.708	4.376	0.0124	0.0343	3.379	2.234	0.0781	0.2262
Average percentage purification of the crude sewage	...	...	...	...	40.8	48.9	...	...
	Intermittent treatment. Settled sewage as supplied to the 13.foot coke.bed.				Intermittent treatment. Effluent from the 13.foot coke.bed.
1899.
February 27.March 25	• • •	4.856	0.0026	Nil		2.268	0.0270	0.0693
March 27.October 9	...	4.826	0.0034	0.0023	...	2.546	0.0355	0.1673
October 13.December 22	10.110	6.522	0.0044	0.0048	3.748	2.753	0.0540	0.1778
1900.
January	7.096	5.195	0.0867	0.1667	3.146	2.204	0.1249	1.0861
February	7.050	5.158	0.1050	0.1549	3.390	2.576	0.1595	4.4163
March	7.334	5.632	0.0241	0.0056	3.519	2.755	0.0244	0.0997
April	9.128	6.849	Nil	Nil	4.667	3.391	Nil	0.0191
May	5.480	4.047	Nil	Nil	2.560	1.744	0.0342	0.0520
June	5.378	3.944	Nil	Nil	2.427	1.896	0.0023	0.0146
July	5.484	3.709	Nil	Nil	2.092	1.559	0.0117	0.0074
Average for 1900	6.328	4.644	0.0300	0.0426	2.885	2.150	0.0511	0.2197
Average for the whole period	7.159	4.962	0.0141	0.0186	3.075	2.394	0.0434	0.1829
Average percentage purification of the crude sewage	...	...	...	...	57.0	51.8	...	...