Nottinirham. 



duplicates which were jointed, the oxygen in 

 No. Ill was reduced from 3"0 c.c. to 1"6 c.c per litre 

 in ten days at atmospheric summer temperature, 

 while that in No. 121 underwent no reduction in 

 nine days under like conditions, remaining at about 

 6 c.c. per litre. This is, of course, very remarkable 

 for an effluent, and places it, in this respect, among 

 drinking waters. The last four samples, drawn in 

 September, 1901, were (like No. Ill) not so highly 

 aerated as the others when they reached the labora- 

 tory, containing an average of about 2'5 c.c. dis- 

 solved oxygen ; but in every case the duplicates 

 retained something like 1 c.c. of this after being 

 jointed and incubated at 26'7deg. C. (80 deg. Fahr.) 

 for a fortnight. For a non-drinking-water stream 

 there was nothing offensive about the water, but it 

 was not of high quality; not nearly so good, in fact, 

 as the Nottingham sewage farm effluents. The 

 jointed samples kept for a week to a fortnight in 

 warm summer weather retained a little dissolved 

 oxygen (No. 117 as much as 4 c.c). 



" The sewage (four - seventh 

 Conoluslons, domestic, three - sevenths trade 

 refuse) is strong. For a filtration 

 farm Nottingham was not treating a large volume 

 of sewage, either per acre of the ' working ' daily 

 irrigable area, or per acre of the total irrigable area, 

 more especially if the nature and effective internal 

 purifying surface of the soil and subsoil are taken 

 into consideration ; but it was actually treating a 

 large quantity of organic matter. The sewerage 

 system is combined, but the farm deals with very 

 little of the storm water. There can be no doubt that 

 23,300 gallons per acre per twenty-four hours (10,750 

 gallons per acre of the total irrigable area per 

 twenty-four hours) is not too large a volume of 

 even a strong sewage to be treated by screening 

 (partial) and filtration through about 6 ft. of soil 

 and subsoil (sandy loam overlying gravel and 

 sand) of the nature of that found at Nottingham. 

 It is pleasant to be able to call attention to the 

 fact of a sewage farm working well within its 



There was no noticeable smell 

 Nuisance • • i .-. 



and Diffloultles. ^."''''^ ^"^"^ *^^ sewaging opera- 

 tions. Occasionally, in hot weather, 

 the stirring up of the sewage in passing under 

 the road syphons causes a slight smell, but only 

 in the immediate vicinity. The available area is 

 barely sufficient for the present volume of sewage, 

 and the former will be greatly increased shortly, as 

 the farm is soon to be enlarged to more than double. 

 The carriers are worked to their utmost capacity, fre- 

 quently overflowing at the period of maximum flow, 

 and consequently can only deal with a small amount 

 of storm water in addition to the sewage proper. 



limits of purifying power, and as a result yield- 

 ing effluents of a highly satisfactory character." 

 (Part I., page 93.) 



LATER WORK. 



At the time Mr. Kershaw's report was made 

 an extension of the farm to a total area of 1,946 

 acres was in progress. The additional area is now 

 being brought into use, and the sewage is fed to the 

 new land by a series of syphons ending in concrete 

 chambers. The irrigable area is increased by 

 515 acres, making a total of 1,166 acres for sewage 

 treatment. 



47 



