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OJOJONA | RAW WATER | TREATED WATER |
|---|---|---|
pH (UN) | 6.51 - 6.8 | 6.26 - 6.56 |
Alkalinity (mg/L CaCO3) | 34.7 - 36.3 | 17.3 - 19.4 |
MARCALA | RAW WATER | TREATED WATER |
pH (UN) | 6.44 - 7.28 | 6.07 - 6.45 |
Alkalinity (mg/L CaCO3) | 15.3 | Before chlorination 8.7 |
CUATRO COMUNIDADES | RAW WATER | TREATED WATER |
pH (UN) | 6.34 - 7.00 | 6.80 - 6.85 |
Alkalinity (mg/L CaCO3) | 7.65 | Before chlorination 4.59 |
TAMARA | RAW WATER | TREATED WATER |
pH (UN) | La Chorrera: 6.44 | 6.56 - 6.66 |
Alkalinity (mg/L CaCO3 | La Chorrera: 7.14 | 4.08 |
Table 1: Water Quality in Honduras
Source: Honduras water reports, 2009
(Use a wiki table, not a poor quality image. Include a link to the data source. These reports are all posted on the AguaClaraES wiki.)
(What conditions are you going to design the lime feeder for (i.e. worse conditions)?)
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The pH of calcium hydroxide(lime) solution decreases with an increase in temperature. (see figure 1 below) The temperature at the Honduran plants is generally in the range of 19-21 degrees C but during summers it can increase to 27 degrees C. This temperature change can change the pH of lime and thereby affect the working of the lime feeder and needs to be taken into consideration while designing the lime feeder. (Explain how this is expected behavior of solute in water with respect to temperature. Why is pH of the saturated solution decreasing with increasing temperature?) 
Temperature ºC | pH |
|---|---|
0 | 13.423 |
5 | 13.207 |
10 | 13.003 |
15 | 12.810 |
20 | 12.627 |
25 | 12.454 |
30 | 12.289 |
35 | 12.133 |
40 | 11.984 |
45 | 11.841 |
50 | 11.705 |
55 | 11.574 |
60 | 11.449 |
Table 2: Changes in pH of lime with respect to Temperature changes
(give descriptive names to the images files. Replaces this image with a graph.)
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