. Composition and treatment of Lake Michigan water . pvh «h PiP Ph o rd CP CO Pi S H Pi oo ca •H h H•P H CQ aJ CD H WS Cv5 pi U 03 r-J«4 hD ttu to Pi•H B pi Pi Pi Pi pi Pi •H •H •H •H •rl •H t s s B B B Pi IP 0 10 t> 10 CO » CO 1 CO 1 LP IP 1 1 CO H IP 1 1 to ! 10 UO 1 «£> 1 to rH vO to CO H/ rH to to to IP IP COHH 0 0 • O • O • O • 0 • 0 • 0 • 0 * O • O • C\J CVJ CM CXI CX2 0 O O O 0 O 0 O O O • • • • • • • • • • CVJ CM <X2 CvJ O IP O LP 0 LCj 0 IP 0 1 • • • • • • • • • H H to to LP <HO cp idB o PI o o M rH 05 P -H 03 3! OHOH p! Pi P LP H to O CM LP O O to 00 • • • • • • • • • • t
. Composition and treatment of Lake Michigan water . pvh «h PiP Ph o rd CP CO Pi S H Pi oo ca •H h H•P H CQ aJ CD H WS Cv5 pi U 03 r-J«4 hD ttu to Pi•H B pi Pi Pi Pi pi Pi •H •H •H •H •rl •H t s s B B B Pi IP 0 10 t> 10 CO » CO 1 CO 1 LP IP 1 1 CO H IP 1 1 to ! 10 UO 1 «£> 1 to rH vO to CO H/ rH to to to IP IP COHH 0 0 • O • O • O • 0 • 0 • 0 • 0 * O • O • C\J CVJ CM CXI CX2 0 O O O 0 O 0 O O O • • • • • • • • • • CVJ CM <X2 CvJ O IP O LP 0 LCj 0 IP 0 1 • • • • • • • • • H H to to LP <HO cp idB o PI o o M rH 05 P -H 03 3! OHOH p! Pi P LP H to O CM LP O O to 00 • • • • • • • • • • to to H^ LP LP LO LP H CVJ to £> CO cr> O 1 H =£9=. -37- with the alum would cause a slight softening effect and yield asatisfactory floe which would settle quickly. Table ZII shows theresults when a constant amount of alum is used with varying amountsof lime. A satisfactory floe was obtained with grains of alumand grains of lime. The floe formed in one-half hour andsettled readily. The amount of floe obtained was practicallyequivalent to that obtained with 2 l/2 grains of alum when alum alonewas used. Owing to the cheapness of lime in comparison with alum,there would be quite a saving in the cost for chemicals used. Ifbulk lime at a cost of $ per ton is used and alum at a cost of$ per ton, we can compare the cost of the two treatments asfollows: TABLE XIII. Cost Cost Total Al2fS04)3 CaO eost Grains per per per per Grains million million million gallon per gallons gallons gallons Al«(S0*)a gallon of water of water of water used CaO. treated. treated treated 2,0 $ $ $ $ $.64 $ so
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttheses, bookyear1909
