1947-1948 — Page 72

CHLORIDE OF LIME

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ANNEX VI.

CHEMICAL TREATMENT OF WATER 1947/48.

CHLORINE GAS

ALUMINA

LIME

SODA ASH

FILTERS

Chlorine Dose Dose REMARKS Quantity in lbs. Days Parts Per Million Quantity in lbs Days Parts per Million Quantity in lbs. Quantity in lbs. ISLAND: Eastern Slow Sand 29,677 160 Bowen Road Rapid Gravity 12,994 Albany Slow Sand 6,156 5238 528 598 91 .75 19 1.00 5,352 1.25 27 113 .75 1.00 96 1.50 91 .75 19 1.00 3,903 57 .75 79,238 35,962 3,713 1.25 114 1.00 91 .75 57 .75 19 1.00 2,471 100 1.00 1.25 11 1.25 3 1.50 Elliot Rapid Gravity > Slow Sand 13,557 Elliot, Kennedy Town Slow Sand 3,644 298 82 91 .75 19 1.00 5,101 57 .75 63,739 31,868 80 1.25 118 1.00 91 .75 19 1.00 160 1.25 96 1.50 West Point Slow Sand 1,047 106 1.25 796 56 115 .75 1.00 91 .75 Chai Wan Slow Sand 3,076 19 1.00 130 1.25 1 126 1.50 Pokfulam Slow Sand 772 167 .75 199 1.00 Aberdeen Slow Sand 830 Stanley Rapid Gravity (P) 2,649 149 Shouson Hill 856 122 183 285 28 .75 57 .75 19 1.00 428 187 1.00 42 1.25 90 .75 1.00 1.25 1.30 4,755 2,152 153 65 1.50 2.00 4.00 TOTALS: 74,486 18,823 147,732 69,982 3,866 MAINLAND: Shek Lai Pui Rapid Gravity 48,149 186 .5 19,218 81 .5 5 .525 307,470 22,620 148,841 97 .75 11,430 171 .5 4,732 86 .5 Kowloon Slow Sand 12 .75 97 .75 TOTALS: 59,579 23,950 307,470 22,620 148,841 42,773 455,202 92,602 152,707 GRAND TOTALS: 134,065 =19.9 tons =203.2 tons =41.3 tons -68.1 tons = 59.9 tons

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MAINLAND

From .20 to .60 grains/gallon-Application of Alumina

= From .50 to 1.10 grains/gallon Depending upon the ISLAND

From 10 to 30 grains/gallon=Application of Lime or Soda Ash From .25 to 55 grains/gallon turbidity of the water.

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