. ONTARIO SESSIONAL PAPERS, 1914, k, leavinga clear liquid. At the end of two months the aluminium hydrate at the bottom of the solutiontank had not increased in quantity, that is, the desired quantity of alum had beendischarged into the water. AVhen the coagulant is administered in a clear solution to the water to betreated a flock is formed only aft«r it reaches the raw water. The only differencearising out of the addition of the coagulant solution partially flocked or clear, isthat a very real advantage is obtained in the latter ease because of the flock formingin the raw water. U
. ONTARIO SESSIONAL PAPERS, 1914, k, leavinga clear liquid. At the end of two months the aluminium hydrate at the bottom of the solutiontank had not increased in quantity, that is, the desired quantity of alum had beendischarged into the water. AVhen the coagulant is administered in a clear solution to the water to betreated a flock is formed only aft«r it reaches the raw water. The only differencearising out of the addition of the coagulant solution partially flocked or clear, isthat a very real advantage is obtained in the latter ease because of the flock formingin the raw water. Using an unflocked stock solution undoubtedly gives betterbacteria efBciency. How this is obtained is not known definitely but the flockappears to envelope considerable numbers of the bacteria, and forms, with them asa nucleus, clumped masses, a portion of which settle in the sedimentation chamber,the balance being carried over to the filter to form the schmutzdecke. REPRESENTATION OF 18*-22 BACTERIA COUNTS 3EFORE AND AFTER 2 HOURS STORAGE. IIIIS Jill Hatched porfion sKoujs count after storage. I I 138 THE REPORT OP THE No. 31 REPRESENTATION OF 37 BACTERIA COUNTS BEFORE AND AFTER 2 HOURS STORAGE 9Q0OQ raoM .? idOOO ^ ^ at \ t- -*Q000 / \/\ 1 - 1 M \ \ 1 /A al \ 1 I j^l/lli //w\i y //J/ Al 10,000 / / 1 // llfk jki m/ rk/jjy^ \ 0 i////////// /////M^l/i III, //rfmri>^. ^ I I s s s s i* 5« *\ >\ i i ii Note:- Hatched portion sKoufS cot^nt after storage. When a flocked solution is added to the raw water, it is possible only to formmechanically an artificial strainer on the top of the sand, the bacteria! suspensioniippateiitly not being affected by the settling of the flock in the scilinientation GRAPH SHCWING DAILY AVERAGE ia-22 BACTERIA COUNTS FOR SLOW SAND FILTER
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Keywords: ., bookauthorontariolegislativeass, bookcentury1900, bookdecade1910
