Sewage disposal . 03 03 +J 0 03 0 !-. 00 -pi ?+^ ?3 03 t3 Tfl 02 a d t-I 33 0 03 p3 0 O 0303 -* 72 03 3 in -pj t3 03 s T3 0 £ 5 3 0 „03 a 3 03 S °^ 5? a ) O 03«fc J,EjCD-£2r .S>Sgg3fl3og3 g IcE-s SB SB d is ScjcScc^fl^»—it—i-i—11—^i—1 * 1—11—1 ,—1 a 1H E 4 c3 rO1- ! J d s I H H <$ < !ZJ 0 1 216 BROAD IRRIGATION OR SEWAGE FARMING The low rates on clayey soil at Leicester, Rugby and SouthNorwood will be noticed, as well as the fact that careful screeningand settling has in most cases been found a necessary analyses, which from their source may be considered rep-re
Sewage disposal . 03 03 +J 0 03 0 !-. 00 -pi ?+^ ?3 03 t3 Tfl 02 a d t-I 33 0 03 p3 0 O 0303 -* 72 03 3 in -pj t3 03 s T3 0 £ 5 3 0 „03 a 3 03 S °^ 5? a ) O 03«fc J,EjCD-£2r .S>Sgg3fl3og3 g IcE-s SB SB d is ScjcScc^fl^»—it—i-i—11—^i—1 * 1—11—1 ,—1 a 1H E 4 c3 rO1- ! J d s I H H <$ < !ZJ 0 1 216 BROAD IRRIGATION OR SEWAGE FARMING The low rates on clayey soil at Leicester, Rugby and SouthNorwood will be noticed, as well as the fact that careful screeningand settling has in most cases been found a necessary analyses, which from their source may be considered rep-resentative, indicate that English irrigation effluents are by nomeans of exceptional quality. The Nottingham results are excel-lent, and those obtained at Cambridge, fair. The Aldershotplant appears to be doing good work, in view of the very strongsewage with which it deals. At Altrincham, on the other hand,a weak sewage is not well purified, and the effluents obtained at. Fig. 61. Getting in the Hay Crop on an English Sewage Farm. Croydon, Leicester, Rugby and South Norwood can scarcely beconsidered satisfactory. The most important factor appears tobe the nature of the soil, and its necessary corollary, the methodof operation. At Aldershot, Cambridge and Nottingham, sandyareas are operated by downward nitration alone. Leicester,Rugby and South Norwood stand at the other extreme; theirsoils are mainly clay and the sewage is treated largely by surfaceirrigation. In regard to organic stability, as determined by incubatortests, the experts of the Royal Commission reported that samplesof the effluent at Nottingham never putrefied, while the Cam- SANITARY ASPECTS OF SEWAGE FARMING 217 bridge effluents also stood very high, and of the samples fromLeicester and Aldershot 90 per cent gave no secondary putrefac-tion. Norwood, Croydon and Rugby, on the other hand, gaveputrescible effluents about one-fourth of the time. On the whole,it seems fair to conclude from
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