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Our next step is to build the model between flow rate of lime feeder and the possible change in pH, Alkalinity in plant Marcala and Cuatro Comunidades based on the data from Honduras report spanish version translated by our team member Ximena.
To get the lime dosage we want it is necessary to know the initial total carbonate in the system. e.g CT, from the initial Alkalinity and pH of Marcala and Cuatro Comunidades we can find the CT based on equation 1
The lime dos\age we want should be able to increase the pH of water to the degree we want, while neutralizing the effect of the alum that will be shortly added to it. By calculating the alkalinity under the orginial pH we can find the total carbonate e.g.CT in the system, and then we can find the relationship between the target ANC and the desired pH we want(see figure 1). The total lime dose required in tank is the sum of the amount using to neutralize the alum and to raise the raw water to the desired pH(see equation 2).
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