Previous Research by the AguaClara team in Fall of 2005 to Spring of 2006
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Aluminum solubility diagram showing the importance of maintaining a circumneutral pH for flocculation.
The lime feeder research team investigated the possibility of building a lime feeder for the AguaClara plant at Ojojona. In the end flocculation at Ojojona was successful without lime addition and the lime feeder project was dropped. We now know that low alkalinity waters are common in Honduras and that setting an appropriate alum dose is extremely difficult because addition of a little bit too much alum consumes all of the alkalinity and results in low pH water. At low pH the solubility of
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increases
[ANC control with Lime|^ANC control with Lime.docx] by Amy Yeh
and Melina Diaconis
The following analysis needs to be reviewed and converted to analysis in MathCAD. The analysis includes cost comparisons for ANC control using lime,
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[Ca\left(
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, and sodium carbonate,
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. The mass of the chemical stocks per day is also calculated.
[Preliminary chemistry analysis spreadsheet|^ANC control.xlsm]
lime feeder experiment.jpg