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Water treatment

Table 4.5 Descriptive

Table 4.5 Descriptive Statistics for turbidity, colour, suspended solids and faecal coliforms in MSF plants having upflow gravel filtration with two (UGFS 2 ) and three (UGFS 3 ) units in series as first or second coarse gravel filtration (CGF) stage. October/1990 to December/1998 Descriptive statistics Raw Water CAÑAS GORDAS LA MARINA CEYLAN DyGF UGFS 2 SSF Raw Water UGFS 3 SSF Raw Water UGFS 2 Turbidity (NTU) Mean 12.1 11.2 5.1 0.8 6.0 3.1 1.1 2.8 0.8 0.4 S.D 12.4 12.9 4.9 0.6 12.8 6.8 0.9 1.9 0.9 0.5 Minimum 0.5 2.9 0.3 0.1 0.5 0.2 0.3 0.6 0.2 0.1 Maximum 75 98 28 4.1 112 63 6,2 15 8.0 5.8 No. (Data) 154 116 153 155 111 110 111 114 114 114 Colour (PCU) Mean 21 19 16 4 7 5 3 5 4 3 S.D 13 12 15 3 12 10 2 3 3 1 Minimum 3 3 2 2 2 2 2 2 2 2 Maximum 70 70 132 18 116 103 16 21 21 8 No. (Data) 154 116 154 155 111 111 111 114 114 114 Suspended Solids (mgl -1 ) Mean 12.1 12.0 2.7 0.2 9.0 1.6 0.3 2.8 0.3 0.1 S.D 21.9 32.5 6.8 0.2 42.6 4.8 0.3 4.3 0.7 0.1 Minimum 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Maximum 126 238 54 1.3 384 34 1.7 34 5.6 0.6 No. (Data) 74 70 73 74 82 81 82 84 84 84 Faecal Coliforms (CFU/100ml) Mean 7,046 5,334 408 1.5 803 139 1.8 330 52 0.9 S.D 21,879 12,669 548 3.4 3,417 172 3.5 303 59 2.0 Minimum 110 120 0 0 30 0 0 46 4 0 Maximum 223,000 95,000 3,670 23 35,700 1,250 28 1,920 382 12 No. (Data) 148 89 145 151 108 106 109 111 112 114 SSF Table 4.6 Descriptive Statistics for turbidity, colour, suspended solids and faecal coliforms in MSF plants having horizontal gravel filtration as first or second coarse gravel filtration (CGF) stage. October/1990 to December/1998 Descriptive JAVERIANA RESTREPO statistics Raw Water DyGF HGF SSF Raw Water HGF SSF Turbidity (NTU) Mean 24.2 17.2 4.9 0.9 7.5 2.6 0.6 S.D 35.1 31.0 4.9 0.9 9.4 3.0 0.4 Minimum 3.0 3.0 1.0 0.2 1.7 0.5 0.2 Maximum 300 292 40 12.0 55 27 2.8 No. (Data) 273 266 270 273 112 112 112 Colour (PCU) Mean 30 27 16 4 12 7 3 S.D 25 21 14 3 16 10 2 Minimum 3 3 2 2 2 2 2 Maximum 200 198 104 30 130 91 12 No. (Data) 272 266 272 272 111 111 111 Suspended Solids (mgl -1 ) Mean 33.9 22.9 1.7 0.1 4.1 0.8 0.2 S.D 100.4 94.8 3.5 0.2 6.1 2.4 0.1 Minimum 0.2 0.1 0.1 0.1 0.1 0.1 0.1 Maximum 1,040 922 27 1.4 38 20 0.9 No. (Data) 159 156 160 164 79 77 79 Faecal Coliforms (CFU/100ml) Mean 14,935 9,092 922 0.8 831 77 0.7 S.D 28,532 18,816 5,431 2.2 1,821 324 2.5 Minimum 310 210 7 0 10 0 0 Maximum 204,000 146,000 83,000 25 15,100 3,270 23 No. (Data) 264 231 261 265 105 105 107 160

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