Land Treatment of Sewagre. 



perature, these figures indicate that there was still 

 a little fermentable organic matter left in some 

 of the effluents. In the summer samples of water 

 from the stream the dissolved oxygen had gone 

 down to zero, or nearly zero, in every case when 

 the analysis came to be made; this is, of course, 

 very unsatisfactory. 



was treating a large volume of sewage, either 

 per acre of the ' working ' daily irrigable area, 

 or per acre of the total irrigable area ; but it 

 was treating, both actually and relatively, a large 

 quantity of organic matter. Moreover, the soil and 

 subsoil (coarse sand over very fine sand) are not of 

 the best kind for purifying a large volume of sewage. 



Nuisance 

 and Difficulties. 



There is no objectionable 

 smell noticeable on the farm in 

 connection with the distribution 

 of the sewage, except in removing and carting the 

 sludge, but this is in no degree worse than that 

 which would occur in leading manure on any ordi- 

 nary farm. One of the principal difficulties form- 

 ally experienced in the working of the farm was 

 that of obtaining farm labourers in the imme- 

 diate vicinity of the Camp. There was also a lack 

 of suitably built cottages, now provided close to 

 the farm. Another difficulty was the delay ex- 

 perienced in obtaining the carrying out of neces- 

 sary improvements. The number of men employed 

 on the farm varies considerably, but is usually from 

 twenty to thirty, working under the direction of 

 the farm bailiff, superintended by Col. Jones. 



" The sewage (purely domes- 

 tic) is strong. It cannot be 

 said that for a filtration farm Aldershot Camp 



Conclusions. 



and the average filtration depth down to the drains 

 is only about 3 ft. . . . On the whole we 

 consider that 25,000 gallons per acre for twenty- 

 four hours (8,300 gallons per acre on the total 

 irrigable area per twenty-four hours) is too large 

 a volume of a strong sewage to be treated by screen- 

 ing, settling, and filtration, through about 3 ft. of 

 sand of the above nature, if completely and uni- 

 formly satisfactory effluents are to be expected, 

 but not too large a volume of sewage per acre to 

 yield effluents showing a high percentage (pos- 

 sibly even a sufficient relative degree) of purifica- 

 tion." (Part I., page 81.) 



LATER WORK. 



The area of the farm, the method of treatment, 

 (fee, remain unaltered. A footnote to page 10 of 

 Part II. runs : " Since then we understand that the 

 water supply has been reduced to 25 gallons per 

 head." 



i6 



