chemdose_f function

Calculate new fluoride concentration after dosing alum.

Applies equation of the form: raw_f - Aalum^aph ^ b * raw_f^c. There is no published model, so it is recommended to fit the coefficients with experimental data. When fitting, the following units must be used: Alum in mg/L as chemical, Fluoride in mg/L, pH in SU. Default coefficients are fit from Sollo et al (1978). This function outputs a water class object with an updated fluoride concentration (which will be in M, per standard water units).

chemdose_f(water, alum, coeff = c(1.11, 0.628, -2.07, 0.861))

Arguments

• water: Source water object of class "water" created by define_water
• alum: Amount of hydrated aluminum sulfate added in mg/L: Al2(SO4)3*14H2O + 6HCO3 -> 2Al(OH)3(am) +3SO4 + 14H2O + 6CO2
• coeff: Model coefficients to use as vector of numbers.

Returns

A water class object with an updated fluoride concentration.

Examples

dosed_water <- define_water(ph = 7, temp = 25, alk = 50, f = 4) %>%
  chemdose_ph(alum = 50) %>%
  chemdose_f(alum = 50)

convert_units(dosed_water@f, "f", "M", "mg/L")