394 G. J. BURROWS. 



NOTES ON GOULBURN WATER with SOME EXPERL 

 MENTS on its CLARIFICATION. 



By G. J. Burrows, Caird Scholar, University of Sydney. 

 (Communicated by Prof. J. A. Schofield.) 



[Read before the Royal Society of N. S. Wales, December 1, lb09 ] 



The suspended matter in the water of the Wollondilly 

 River, from which the Goulburn water supply is derived, 

 is in a very finely divided condition, taking an extremely 

 long time to settle and being very difficult to filter. In 

 some circumstances, e.g., after heavy rain, the present 

 storage and filtration arrangements do not admit of the 

 complete removal of this suspended matter, and the water 

 is supplied to the town in a turbid condition. The follow- 

 ing experiments were undertaken primarily with the object 

 of ascertaining the minimum amount of clarifying agents 

 required on a laboratory scale to give a clear water in a 

 reasonable time. The samples were taken by the water 

 works engineer from the reservoir into which the water is 

 pumped from the river. The first sample, taken on October 

 14th, 1908, was almost clear, and therefore not suitable 

 for clarifying experiments. Pending the arrival of a turbid 

 sample this water was analysed with the following results: 



parts per 100,000 



Total solid residue 



... 22*1 



Loss on ignition... 



... 11*2 



Chlorine 



... 3*9 



Organic ammonia 



... '058 



Free ammonia ... 



... '017 



Hardness, temporary ... 



... 8*0 



Hardness, permanent ... 



... 7*5 



Nitrogen as nitrates ... 



... '006 



